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Sep 24, 2013
09/13
by
R. J. Ivison
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eye 48
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We develop and apply a dual-survey extraction technique to published submm images of the Lockman Hole using the SCUBA and MAMBO bolometer arrays. Cut above 5 sigma, this catalogue of submm galaxies (SMGs) is significantly more robust than previous samples, typically selected above 3.0-3.5 sigma, with a much-reduced likelihood of real, faint SMGs (beneath and around the confusion limit) entering the catalogue via superposition with noise. Our selection technique yields 19 SMGs of which we expect...
Source: http://arxiv.org/abs/astro-ph/0412084v3
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72
Sep 19, 2013
09/13
by
R. J. Ivison
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eye 72
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At a conference devoted to ever deeper surveys hunting for ever more distant galaxies, I posed a question for which a concensus view has been difficult to reach: `Is there evidence for, or can we rule out, a significant population of dust-obscured starbursts at z > 3?' If, as seems likely, submm-selected galaxies are proto-ellipticals, one of the biggest unanswered questions is whether a significant fraction form at very high redshift - perhaps by the collapse of single gas clouds - or...
Source: http://arxiv.org/abs/astro-ph/0701453v1
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39
Sep 19, 2013
09/13
by
R. J. Ivison
texts
eye 39
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A search for millimetric continuum emission from eight optically-selected, radio-quiet quasars and a radiogalaxy with 3.7 < z < 4.3, has been undertaken using a highly sensitive 7-channel bolometer on the IRAM 30-m Millimetre Radio Telescope. Detections of a potentially dust-rich quasar, and of 8C1435+635, the most distant known radiogalaxy, are reported. An extrapolation of the steepening centimetric radio spectrum of 8C1435+635 accounts for less than one per cent of the observed 1.25-mm...
Source: http://arxiv.org/abs/astro-ph/9506039v1
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57
Sep 18, 2013
09/13
by
J. Mikolajewska; R. J. Ivison
texts
eye 57
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We have determined the spectral energy distribution at wavelengths between 6 cm and 0.85 mm for the proto-typical S(stellar)-type symbiotic star, CI Cygni, during quiescence. Data were obtained simultaneously with the Very Large Array and the SCUBA sub-millimetre (sub-mm) camera on the James Clerk Maxwell Telescope. The data have allowed us to determine the free-free turnover frequency of the ionised component, facilitating a model-dependent estimate of the binary separation to compare with the...
Source: http://arxiv.org/abs/astro-ph/0101526v1
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60
Sep 21, 2013
09/13
by
A. D. Biggs; R. J. Ivison
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eye 60
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We have produced sensitive, high-resolution radio maps of 12 SMGs in the Lockman Hole using combined MERLIN and VLA data at a frequency of 1.4 GHz. Integrating for 350hr yielded an r.m.s. noise of 6.0 uJy/beam and a resolution of 0.2-0.5". For the first time, wide-field data from the two arrays have been combined in the (u,v) plane and the bandwidth smearing response of the VLA data has been removed. All of the SMGs are detected in our maps as well as sources comprising a non-submm...
Source: http://arxiv.org/abs/0712.3047v1
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56
Sep 21, 2013
09/13
by
P. P. Papadopoulos; R. J. Ivison
texts
eye 56
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We examine the physical conditions of the molecular gas in the extremely red object (ERO), HR10 at z=1.44, as constrained by the recent detection of CO J+1 -> J, J=1, 4 lines. The line ratios of such widely spaced CO transitions are extremely sensitive probes of gas excitation; in the case of the HR10, they provide a rare opportunity to study the state of the molecular gas in a gas-rich starburst at a cosmologically significant distance. Contrary to earlier claims, we find the CO J=5-4...
Source: http://arxiv.org/abs/astro-ph/0104431v2
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74
Sep 20, 2013
09/13
by
E. R. Seaquist; R. J. Ivison
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eye 74
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Recent maser surveys have shown that many potential OH/IR stars have no OH masers in their circumstellar envelopes, despite the modest requirements which should be implicitly met by IRAS colour-selected candidates. It has been suggested that these OH/IR colour mimics must have a degenerate companion which dissociates OH molecules and disrupts the masing action, ie. that they are related to symbiotic Miras. Coincidentally, there is a paucity of long-period symbiotic Miras and symbiotic OH/IR...
Source: http://arxiv.org/abs/astro-ph/9402056v1
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55
Sep 18, 2013
09/13
by
A. D. Biggs; R. J. Ivison
texts
eye 55
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We present catalogues of faint 1.4-GHz radio sources from extremely-deep Very Large Array pointings in the Lockman Hole, the Hubble Deep Field North (HDF-N) and ELAIS N2. Our analysis of the HDF-N data has produced maps that are significantly deeper than those previously published and we have used these to search for counterparts to submm sources. For each of the fields we have derived normalised differential source counts and in the case of the HDF-N find no evidence for the...
Source: http://arxiv.org/abs/astro-ph/0606595v1
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128
Sep 19, 2013
09/13
by
J. Mikolajewska; R. J. Ivison; A. Omont
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eye 128
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We discuss mm/submm spectra of a sample of symbiotic binary systems, and compare them with popular models proposed to account for their radio emission. We find that radio emission from quiescent S-type systems originates from a conical region of the red giant wind ionized by the hot companion (the STB model), whereas more complicated models involving winds from both components and their interaction are required to account for radio emission of active systems. We also find that the giant...
Source: http://arxiv.org/abs/astro-ph/0102198v1
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85
Sep 18, 2013
09/13
by
J. Mikolajewska; R. J. Ivison; A. Omont
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eye 85
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We present and discuss mm/submm observations of quiescent S-type symbiotic systems, and compare them with popular models proposed to account for their radio emission. We find that the M giant mass-loss rates derived from our observations are systematically higher than those reported for single M giants.
Source: http://arxiv.org/abs/astro-ph/0210491v1
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38
Sep 20, 2013
09/13
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Ian Smail; G. P. Smith; R. J. Ivison
texts
eye 38
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We discuss the properties of the bright submillimeter source SMMJ14011+0252 at z=2.56 which lies behind the central regions of the z=0.25 lensing cluster A1835. This system has a complex optical morphology consisting of at least five separate components. We reassess the extensive multiwavelength observations of this system and find strong support for the suggestion that one of these five components represents a foreground galaxy. The spectral and morphological properties of the foreground...
Source: http://arxiv.org/abs/astro-ph/0506176v1
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77
Sep 18, 2013
09/13
by
A W Blain; R J Ivison; Ian Smail
texts
eye 77
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The first observations to detect a population of distant galaxies directly in the submillimetre waveband have recently been made using the new Submillimetre Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope (JCMT). The results indicate that a large number of distant galaxies are radiating strongly in this waveband. Here we discuss their significance for source confusion in future millimetre/submillimetre-wave observations of both distant galaxies and cosmic microwave...
Source: http://arxiv.org/abs/astro-ph/9710003v3
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37
Sep 22, 2013
09/13
by
Ian Smail; R. J. Ivison; A. W. Blain
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eye 37
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We present the first results of a sub-millimeter survey of distant clusters using the new Sub-mm Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope. We have mapped fields in two massive, concentrated clusters, A370 at z=0.37 and Cl2244-02 at z=0.33, at wavelengths of 450 and 850-um. The resulting continuum maps cover a total area of about 10 sq. arcmin to 1 sigma noise levels less than 14 and 2 mJy per beam at the two wavelengths, 2-3 orders of magnitude deeper than was...
Source: http://arxiv.org/abs/astro-ph/9708135v2
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40
Sep 22, 2013
09/13
by
T. R. Greve; R. J. Ivison; P. P. Papadopoulos
texts
eye 40
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We report the first detection of the lowest CO transition in a sub-millimetre bright galaxy and extremely red object (ERO) at z = 1.44 using the Very Large Array. The total J = 1 - 0 line luminosity of ERO J164502+4626.4 is (7+-1) x 10^{10} K km s^{-1} pc^2, which yields a total molecular gas mass of ~6 x 10^{10} Msun. We also present a map of the 850-um continuum emission obtained using SCUBA, from which we infer a far-IR luminosity and dust mass of L_FIR ~ 9 x 10^{12} Lsun and M_d ~ 9 x...
Source: http://arxiv.org/abs/astro-ph/0309213v1
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56
Sep 21, 2013
09/13
by
R. S. Priddey; R. J. Ivison; K. G. Isaak
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eye 56
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The most massive haloes at high redshift are expected, according to hierarchical cosmologies, to reside in the most biased density fields. If powerful active galactic nuclei (AGN) are expected to exist anywhere in the early Universe (z>5), it is within these massive haloes. The most luminous of these AGN, powered by supermassive black holes (SMBHs) ~10^9Msun, thereby present an opportunity to test models of galaxy formation. Here, we present submillimetre (submm) continuum images of the...
Source: http://arxiv.org/abs/0709.0610v1
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64
Sep 22, 2013
09/13
by
A. D. Biggs; J. D. Younger; R. J. Ivison
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eye 64
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We present continent-scale VLBI - obtained with the European VLBI Network (EVN) at a wavelength of 18cm - of six distant, luminous submm-selected galaxies (SMGs). Our images have a synthesized beam width of ~30 milliarcsec FWHM - three orders of magnitude smaller in area than the highest resolution VLA imaging at this wavelength - and are capable of separating radio emission from ultra-compact radio cores (associated with active super-massive black holes - SMBHs) from that due to starburst...
Source: http://arxiv.org/abs/1004.0009v2
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50
Sep 20, 2013
09/13
by
R. J. Ivison; E. R. Seaquist; P. J. Hall
texts
eye 50
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We present the first results from an all-sky maser-line survey of symbiotic Miras. Interferometric spectral-line observations of R Aqr and H1-36 Arae have revealed a 22-GHz water maser in the former and 1612-MHz hydroxyl and weak 22-GHz water maser emission from the latter. H1-36 has thus become the first known symbiotic OH/IR star. We have also detected weak OH line emission from the vicinity of R Aqr, but we note that there are small discrepencies between the OH- and H2O-line velocities and...
Source: http://arxiv.org/abs/astro-ph/9402055v1
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61
Sep 23, 2013
09/13
by
C. M. Pierce; D. R. Ballantyne; R. J. Ivison
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eye 61
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Nuclear starbursts may contribute to the obscuration of active galactic nuclei (AGNs). The predicted star formation rates are modest, and, for the obscured AGNs that form the X-ray background at z < 1, the associated faint radio emission lies just beyond the sensitivity limits of the deepest surveys. Here, we search for this level of star formation by studying a sample of 359 X-ray selected AGNs at z < 1 from the COSMOS field that are not detected by current radio surveys. The AGNs are...
Source: http://arxiv.org/abs/1110.0982v1
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50
Sep 21, 2013
09/13
by
T. R. Greve; R. J. Ivison; P. P. Papadopoulos
texts
eye 50
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We report on the detection of the lowest CO J = 1 - 0 transition in the powerful high-redshift radio galaxy 4C60.07 at z = 3.79. The CO emission is distributed in two spatially and kinematically distinct components as was previously known from the observations of the higher excitation CO J = 4 - 3 line. The total molecular gas mass in 4C60.07 inferred from the CO J = 1 - 0 emission is M(H_2) = 1.3 x 10^11 M_sun, sufficient to fuel the inferred star-formation rate of ~1600 M_sun yr^-1 for 10^8...
Source: http://arxiv.org/abs/astro-ph/0402464v1
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53
Sep 18, 2013
09/13
by
T. R. Greve; R. J. Ivison; J. A. Stevens
texts
eye 53
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Using the filled bolometer array SHARC-II on the Caltech Submillimeter Observatory (CSO), we have obtained deep (rms ~ 15mJy/beam), high-quality 350 micron maps of five of the most luminous high-z radio galaxies known. In all cases the central radio galaxy is detected at the >3sigma level, and in some cases the high resolution of SHARC-II (FWHM ~ 9") allows us to confirm the spatially extended nature of the dust emission. In PKS1138-262 (z=2.156), 8C1909+722 (z=3.538) and 4C41.17...
Source: http://arxiv.org/abs/astro-ph/0509364v1
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66
Sep 21, 2013
09/13
by
Ian Smail; A. M. Swinbank; R. J. Ivison; E. Ibar
texts
eye 66
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We investigate whether strong molecular and atomic emission lines at far-infrared wavelengths can influence the identification and derived properties of galaxies selected from broad-band, far-infrared or submillimetre observations. Several of these lines, e.g. [CII]158um, have been found to be very bright in some high-redshift galaxies, with fluxes of >0.1-1% of the total far-infrared luminosity, and may be even brighter in certain populations at high redshifts. At redshifts where these...
Source: http://arxiv.org/abs/1104.1758v1
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40
Sep 22, 2013
09/13
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David G. Gilbank; Ian Smail; R. J. Ivison; C. Packham
texts
eye 40
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We present the results from a survey for Extremely Red Objects (EROs) in deep, high resolution optical images taken from the Hubble Space Telescope (HST) Medium Deep Survey. We have surveyed 35 deep F814W HST/WFPC2 fields in the near-infrared to a typical depth of K~20. From a total area of 206 arcmin^2 and to a limit of K=20.0 we identify 224 EROs ((1.14+/-0.08) arcmin^-2) with (I_{814}-K)=>4.0 and 83 ((0.41+/-0.05) arcmin^-2) with (I_{814}-K)=>5.0. We find that the slope of the number...
Source: http://arxiv.org/abs/astro-ph/0308318v1
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38
Sep 24, 2013
09/13
by
S. C. Chapman; A. W. Blain; Ian Smail; R. J. Ivison
texts
eye 38
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We have obtained spectroscopic redshifts using the Keck-I telescope for a sample of 73 submillimeter (submm) galaxies for which precise positions are available. The galaxies lie at redshifts out to z=3.6, with a median redshift of 2.2. The dust-corrected ultraviolet (UV) luminosities of the galaxies rarely hint at their huge bolometric luminosities indicated by their radio/submm emission, underestimating the true luminosity by a median factor of ~100 for SMGs with pure starburst spectra. The...
Source: http://arxiv.org/abs/astro-ph/0412573v3
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55
Sep 23, 2013
09/13
by
A. W. Blain; R. J. Ivison; Ian Smail; J. -P. Kneib
texts
eye 55
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The flux density from undetected sources in the observing beam of a telescope produces source confusion noise in the resulting maps of the sky, and thus limits sensitivity. In a recent paper we discussed this effect in the millimetre/submillimetre waveband, using a simple model of galaxy evolution that could account for the gravitationally lensed images of distant dusty galaxies newly discovered in the fields of clusters of galaxies. New models explain all the available mm, submm and...
Source: http://arxiv.org/abs/astro-ph/9806063v1
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51
Sep 24, 2013
09/13
by
Ian Smail; S. C. Chapman; A. W. Blain; R. J. Ivison
texts
eye 51
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We present optical and near-IR photometry of 96 dusty, far-IR luminous galaxies. We have precise spectroscopic redshifts for all these galaxies yielding a median redshift of z=2.2. The majority, 78, are submm-detected galaxies lying at z=0.2-3.6, while the remaining 18 are optically-faint uJy radio galaxies at z=0.9-3.4 which are proposed to be similarly luminous, dusty galaxies whose dust emission is too hot to be detected in the submm. We compare the photometric and morphological properties...
Source: http://arxiv.org/abs/astro-ph/0412574v1
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48
Sep 23, 2013
09/13
by
A. W. Blain; Ian Smail; R. J. Ivison; J. -P. Kneib
texts
eye 48
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A population of distant dusty galaxies emitting in the submillimetre waveband has recently been detected using the Submillimetre Common-User Bolometer Array (SCUBA) camera on the James Clerk Maxwell Telescope (JCMT). This population can be used to trace the amount of high-redshift star-formation activity that is obscured from view in the optical waveband by dust, and so is missing from existing inventories of star formation in the distant Universe. By including this population we can construct...
Source: http://arxiv.org/abs/astro-ph/9806062v5
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103
Sep 18, 2013
09/13
by
K. Belczynski; J. Mikolajewska; U. Munari; R. J. Ivison; M. Friedjung
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eye 103
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We present a new catalogue of symbiotic stars. In our list we include 188 symbiotic stars as well as 28 objects suspected of being symbiotic. For each star, we present basic observational material: coordinates, V and K magnitudes, ultraviolet (UV), infrared (IR), X-ray and radio observations. We also list the spectral type of the cool component, the maximum ionization potential observed, references to finding charts, spectra, classifications and recent papers discussing the physical parameters...
Source: http://arxiv.org/abs/astro-ph/0005547v1
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61
Sep 23, 2013
09/13
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Ian Smail; R. J. Ivison; A. W. Blain; J. -P. Kneib
texts
eye 61
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We present optical morphologies obtained from deep HST and ground-based images for galaxies selected from the first sub-millimeter survey of the distant Universe. Our sample comprises galaxies detected in deep 850-micron continuum maps of seven massive clusters, obtained using SCUBA, the new bolometer camera on the JCMT. The survey covers a total area of 0.01 square degrees to 1-sigma noise levels of about 2 mJy/beam. We detect a total of 25 sources at 850 microns, of which 17 and 10 are...
Source: http://arxiv.org/abs/astro-ph/9806061v1
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60
Sep 19, 2013
09/13
by
S. C. Chapman; A. W. Blain; R. J. Ivison; Ian Smail
texts
eye 60
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A significant fraction of the energy emitted in the early Universe came from very luminous galaxies that are largely hidden at optical wavelengths (because of interstellar dust grains); this energy now forms part of the cosmic background radiation at wavelengths near 1mm. These submillimetre (submm) galaxies were resolved from the background in 1997 but have been difficult to identify and study due to the poor spatial resolution of submm instruments. This has impeded the determination of their...
Source: http://arxiv.org/abs/astro-ph/0304235v1
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55
Sep 19, 2013
09/13
by
S. C. Chapman; A. W. Blain; R. J. Ivison; Ian Smail
texts
eye 55
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We present spectroscopic identifications for a sample of 55 submillimeter(submm)-selected `SCUBA' galaxies, lying at redshifts z=0.7 to 3.7, that were pinpointed in deep 1.4-GHz VLA radio maps. We describe their properties, especially the presence of active galactic nuclei (AGN) in the sample, and discuss the connection of the SCUBA galaxies and the formation of spheroidal components of galaxies, which requires knowledge of their masses and the timescales of their very luminous activity. For a...
Source: http://arxiv.org/abs/astro-ph/0304236v1
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51
Sep 18, 2013
09/13
by
D. T. Frayer; Ian Smail; R. J. Ivison; N. Z. Scoville
texts
eye 51
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We report the detection of 1.3mm continuum and near-infrared K-band (2.2-micron) emission from the submillimeter galaxy SMM J00266+1708. Although this galaxy is among the brightest sub-mm sources detected in the blank-sky surveys (L~10^{13} L[sun]), SMM J00266+1708 had no reliable optical/near-infrared counter-part. We used sensitive interferometric 1.3mm observations with the Owens Valley Millimeter Array to accurately determine the position of the sub-mm galaxy. Follow-up near-infrared...
Source: http://arxiv.org/abs/astro-ph/0005239v2
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53
Sep 22, 2013
09/13
by
Nathan Roche; Omar Almaini; James Dunlop; R. J. Ivison; Chris Willott
texts
eye 53
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We investigate the number counts, clustering, morphology and radio/X-ray emission of extremely red objects (EROs), defined as galaxies with R-K>5.0. This criterion will select old, passive ellipticals at z>0.9. To K=21 we identify a total of 158 EROs in 81.5 sq. arcmin. The ERO number counts are lower than predicted by a pure luminosity evolution model, but higher than predicted by current CDM-based hierarchical models. They can be fitted by a combination of moderate merging with a...
Source: http://arxiv.org/abs/astro-ph/0205259v3
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53
Jul 20, 2013
07/13
by
S. C. Chapman; Ian Smail; A. W. Blain; R. J. Ivison
texts
eye 53
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We report spectroscopic redshifts for 18 microJy-radio galaxies at mean redshift of z=2.2 that are faint at both submmillimeter (submm) and optical wavelengths. While the radio fluxes of these galaxies could indicate far-infrared (far-IR) luminosities comparable to high-redshift submillimeter-selected galaxies (>10^12 Lsun), none are detected in the submm. We propose that this new population of galaxies represents an extension of the high-redshift submm galaxy population, but with hotter...
Source: http://arxiv.org/abs/astro-ph/0406596v2
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45
Sep 20, 2013
09/13
by
S. C. Chapman; Ian Smail; R. J. Ivison; A. W. Blain
texts
eye 45
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Spectroscopic surveys of luminous submillimetre-selected sources have uncovered optically-bright galaxies at z
Source: http://arxiv.org/abs/astro-ph/0204086v1
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36
Sep 19, 2013
09/13
by
Andrew W. Blain; Jean-Paul Kneib; R. J. Ivison; Ian Smail
texts
eye 36
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We present the counts of luminous submillimeter (sub-mm) galaxies from an analysis of our survey of the distant Universe through lensing clusters, which uses massive cluster lenses with well-constrained mass models to magnify the background sky. This both increases the sensitivity and reduces the effects of source confusion. Accurate lens models are used to correct the observed sub-mm source counts. The associated uncertainties do not dominate the final errors. We derive counts by two...
Source: http://arxiv.org/abs/astro-ph/9812412v2
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40
Sep 21, 2013
09/13
by
M. J. Page; J. A. Stevens; R. J. Ivison; F. J. Carrera
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eye 40
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Today, almost every galaxy spheroid contains a massive black hole: a remnant of, and testament to, a period in its evolution when it contained an active galactic nucleus (AGN). However, the sequence and timescales of the formation of the black hole and surrounding spheroid of stars are completely unknown, leaving a large gap in our knowledge of how the Universe attained its present appearance. Here we present submillimeter observations of matched samples of X-ray absorbed and unabsorbed AGN...
Source: http://arxiv.org/abs/astro-ph/0407171v1
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Sep 24, 2013
09/13
by
S. C. Chapman; Ian Smail; R. Windhorst; T. Muxlow; R. J. Ivison
texts
eye 38
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We compare high-resolution optical and radio imaging of 12 luminous submm galaxies at z=2.2+/-0.2 observed with HST and the MERLIN and VLA at comparable spatial resolution, 0.3" (2kpc). The radio emission traces the likely far-infrared morphology of these dusty, luminous galaxies. In ~30% of the sample the radio appears unresolved, suggesting that the emission is compact: either an obscured AGN or nuclear starburst. However, in the majority, ~70% (8/12), the radio emission is resolved by...
Source: http://arxiv.org/abs/astro-ph/0412051v2
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4.0
Jun 30, 2018
06/18
by
D. Forgan; R. J. Ivison; B. Sibthorpe; J. S. Greaves; E. Ibar
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eye 4
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We present new observations of the XZ Tau system made at high angular resolution (55 milliarcsec) with the Karl G. Jansky Very Large Array (VLA) at a wavelength of 7 mm. Observations of XZ Tau made with the VLA in 2004 appeared to show a triple system, with XZ Tau A resolved into two sources, XZ Tau A and XZ Tau C. The angular separation of XZ Tau A and C (0.09 arcsec) suggested a projected orbital separation of around 13 AU with a possible orbital period of around 40 yr. Our observations were...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1402.2103
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6.0
Jun 29, 2018
06/18
by
I. Oteo; M. A. Zwaan; R. J. Ivison; I. Smail; A. D. Biggs
texts
eye 6
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We present ALMA ultra-high-spatial resolution ($\sim 20 \, {\rm mas}$) observations of dust continuum at $920 \, {\rm \mu m}$ and $1.2 \, {\rm mm}$ in a pair of submm galaxies (SMGs) at $z = 3.442$, ALMACAL-1 (A-1: $S_{\rm 870 \mu m} = 6.5 \pm 0.2 \, {\rm mJy}$) and ALMACAL-2 (A-2: $S_{\rm 870 \mu m} = 4.4 \pm 0.2 \, {\rm mJy}$). The spectroscopic redshifts of A-1 and A-2 have been confirmed via serendipitous detection of up to nine emission lines. Our ultra-high-spatial resolution data reveal...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1607.06464
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38
Jun 28, 2018
06/18
by
I. Oteo; M. A. Zwaan; R. J. Ivison; I. Smail; A. D. Biggs
texts
eye 38
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We have exploited ALMA calibration observations to carry out a novel, wide and deep submm survey, ALMACAL. These calibration data comprise a large number of observations of calibrator fields in a variety of frequency bands and array configurations. Gathering together data acquired during multiple visits to many ALMA calibrators, it is possible to reach noise levels which allow the detection of faint dusty, star-forming galaxies (DSFGs) over a significant area. In this paper we outline our...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1508.05099
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93
Jul 20, 2013
07/13
by
M. D. Gray; R. J. Ivison; E. M. L. Humphreys; J. A. Yates
texts
eye 93
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Building on the detection of J=7-6 SiO maser emission in both the v=1 and v=2 vibrational states towards the symbiotic Mira, R Aquarii, we have used the James Clerk Maxwell Telescope to study the changes in the SiO maser features from R Aqr over a stellar pulsational period. The observations, complemented by contemporaneous data taken at 86 GHz, represent a test of the popular thermal-instability clump models of SiO masers. The `clump' model of SiO maser emission considers the SiO masers to be...
Source: http://arxiv.org/abs/astro-ph/9712124v1
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53
Sep 18, 2013
09/13
by
D. T. Frayer; R. J. Ivison; I. Smail; M. S. Yun; L. Armus
texts
eye 53
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We report on 450- and 850-micron observations of the interacting galaxy pair, VV114E+W (IC1623), taken with the SCUBA camera on the James Clerk Maxwell Telescope, and near-infrared observations taken with UFTI on the UK Infrared Telescope. The system VV114 is in an early stage of a gas-rich merger. We detect submillimeter (sub-mm) emission extended over 30 arcsec (12 kpc) and find a good correlation between the spatial distribution of the sub-mm and CO emission. Both the CO and sub-mm emission...
Source: http://arxiv.org/abs/astro-ph/9903340v1
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56
Sep 21, 2013
09/13
by
Ian Smail; R. J. Ivison; F. N. Owen; A. W. Blain; J. -P. Kneib
texts
eye 56
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We present deep radio maps from the Very Large Array (VLA) for 16 sources detected in a sub-millimeter (submm) survey of the distant Universe. Our deep VLA 1.4-GHz maps allow us to identify radio counterparts or place stringent limits ( >1. This estimate is a strong lower limit as both misidentification of the radio counterparts and non-thermal emission from an AGN will bias our redshift estimates to lower values. The high median redshift means that the submm population, if predominately...
Source: http://arxiv.org/abs/astro-ph/9907083v3
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41
Sep 19, 2013
09/13
by
M. J. Page; F. J. Carrera; J. Ebrero; J. A. Stevens; R. J. Ivison
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eye 41
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Unexpected in the AGN unified scheme, there exists a population of broad-line z~2 QSOs which have heavily absorbed X-ray spectra. These objects constitute 10% of the population at luminosities and redshifts characteristic of the main producers of QSO luminosity in the Universe. Our follow up observations in the submm show that these QSOs are often embedded in ultraluminous starburst galaxies, unlike most QSOs at the same redshifts and luminosities. The radically different star formation...
Source: http://arxiv.org/abs/astro-ph/0610229v1
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46
Sep 19, 2013
09/13
by
J. A. Stevens; M. J. Page; F. J. Carrera; R. J. Ivison; Ian Smail
texts
eye 46
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We discuss preliminary results from our programme to map the fields of high-redshift AGN. In the context of the hierarchical models such fields are predicted to contain an over-density of young, luminous galaxies destined to evolve into the core of a rich cluster by the present epoch. We have thus imaged from submillimetre to X-ray wavelengths the few-arcmin scale fields of a small sample of high-redshift QSOs. We find that submillimetre wavelength data from SCUBA show striking over-densities...
Source: http://arxiv.org/abs/astro-ph/0610363v1
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47
Sep 21, 2013
09/13
by
J. A. Stevens; M. J. Page; R. J. Ivison; Ian Smail; F. J. Carrera
texts
eye 47
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The genesis of spheroids is central to our understanding of galaxy formation -- they are relatively simple systems, containing about half the stellar mass of the Universe. A major subset of spheroids, massive elliptical galaxies, are preferentially found in clusters where they exhibit old, coeval stellar populations suggesting that they formed synchronously at early epochs. Here we report SCUBA submillimeter imaging of a region around a z=1.8 X-ray selected QSO. The image reveals a remarkable...
Source: http://arxiv.org/abs/astro-ph/0402098v1
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49
Sep 18, 2013
09/13
by
Eleni Vardoulaki; Steve Rawlings; Chris Simpson; David G. Bonfield; R. J. Ivison; Eduardo Ibar
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eye 49
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We study the 37 brightest radio sources in the Subaru/XMM-Newton Deep Field (SXDF). We have spectroscopic redshifts for 24 of 37 objects and photometric redshifts for the remainder, yielding a median redshift z_med for the whole sample of z_med ~= 1.1 and a median radio luminosity close to the `FRI/FRII' luminosity divide. Using mid-IR (Spitzer MIPS 24 um) data we expect to trace nuclear accretion activity, even if it is obscured at optical wavelengths, unless the obscuring column is extreme....
Source: http://arxiv.org/abs/0803.2801v1
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51
Sep 23, 2013
09/13
by
M. J. Page; F. J. Carrera; J. Ebrero; J. A. Stevens; R. J. Ivison
texts
eye 51
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In contradiction to the simple AGN unification schemes, there exists a significant population of broad line, z~2 QSOs which have heavily absorbed X-ray spectra. These objects have luminosities and redshifts characteristic of the sources that produce the bulk of the QSO luminosity in the universe. Our follow up observations in the submillimetre show that these QSOs are embedded in ultraluminous starburst galaxies, unlike most unabsorbed QSOs at the same redshifts and luminosities. The radically...
Source: http://arxiv.org/abs/astro-ph/0511747v1
77
77
Sep 18, 2013
09/13
by
Andrew W. Blain; Ian Smail; R. J. Ivison; J. -P. Kneib; David T. Frayer
texts
eye 77
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A cosmologically significant population of very luminous high-redshift galaxies has recently been discovered at submm wavelengths. Advances in submm detector technologies have opened this new window on the distant Universe. Here we discuss the properties of the high-redshift submm galaxies, their significance for our understanding of the process of galaxy formation, and the selection effects that apply to deep submm surveys. The submm galaxies generate a significant fraction of the energy...
Source: http://arxiv.org/abs/astro-ph/0202228v2
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50
Sep 19, 2013
09/13
by
A. Weiss; R. J. Ivison; D. Downes; F. Walter; M. Cirasuolo; K. M. Menten
texts
eye 50
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We report the redshift of a distant, highly obscured submm galaxy (SMG), based entirely on the detection of its CO line emission. We have used the newly commissioned Eight-MIxer Receiver (EMIR) at the IRAM 30m telescope, with its 8 GHz of instantaneous dual-polarization bandwidth, to search the 3-mm atmospheric window for CO emission from SMMJ14009+0252, a bright SMG detected in the SCUBA Lens Survey. A detection of the CO(3--2) line in the 3-mm window was confirmed via observations of CO(5--4)...
Source: http://arxiv.org/abs/0909.3177v1
