4
4.0
Jun 30, 2018
06/18
Jun 30, 2018
by
W. Luangtip; T. P. Roberts; S. Mineo; B. D. Lehmer; D. M. Alexander; F. E. Jackson; A. D. Goulding; J. L. Fischer
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We present results from a Chandra study of ultraluminous X-ray sources (ULXs) in a sample of 17 nearby (D_L
Topics: High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1410.1569
4
4.0
Jun 29, 2018
06/18
Jun 29, 2018
by
M. P. Koprowski; K. E. K. Coppin; J. E. Geach; N. K. Hine; M. Bremer; S. C. Chapman; L. J. M. Davies; T. Hayashino; K. K. Knudsen; M. Kubo; B. D. Lehmer; Y. Matsuda; D. J. B. Smith; P. P. van der Werf; G. Violino; T. Yamada
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eye 4
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We have observed the dust continuum of ten z=3.1 Lyman Break Galaxies with the Atacama Large Millimeter/Submillimeter Array at ~450 mas resolution in Band 7. We detect and resolve the 870um emission in one of the targets with an integrated flux density of S(870)=(192+/-57) uJy, and measure a stacked 3-sigma signal of S(870)=(67+/-23) uJy for the remaining nine. The total infrared luminosities estimated from full spectral energy distribution fits are L(8-1000um)=(8.4+/-2.3)x10^10 Lsun for the...
Topics: Astrophysics, Cosmology and Nongalactic Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1608.05080
7
7.0
Jun 29, 2018
06/18
Jun 29, 2018
by
M. Yukita; A. E. Hornschemeier; B. D. Lehmer; A. Ptak; D. R. Wik; A. Zezas; V. Antoniou; T. J. Maccarone; V. Replicon; J. B. Tyler; T. Venters; M. K. Argo; K. Bechtol; S. Boggs; F. E. Christensen; W. W. Craig; C. Hailey; F. Harrison; R. Krivonos; K. Kuntz; D. Stern; W. W. Zhang
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eye 7
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We present results from sensitive, multi-epoch NuSTAR observations of the late-type star-forming galaxy M83 (d=4.6 Mpc), which is the first investigation to spatially resolve the hard (E>10 keV) X-ray emission of this galaxy. The nuclear region and ~ 20 off-nuclear point sources, including a previously discovered ultraluminous X-ray (ULX) source, are detected in our NuSTAR observations. The X-ray hardnesses and luminosities of the majority of the point sources are consistent with hard X-ray...
Topics: Astrophysics, High Energy Astrophysical Phenomena, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1604.07441
6
6.0
Jun 29, 2018
06/18
Jun 29, 2018
by
D. M. Alexander; J. M. Simpson; C. M. Harrison; J. R. Mullaney; I. Smail; J. E. Geach; R. C. Hickox; N. K. Hine; A. Karim; M. Kubo; B. D. Lehmer; Y. Matsuda; D. J. Rosario; F. Stanley; A. M. Swinbank; H. Umehata; T. Yamada
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eye 6
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We exploit ALMA 870um observations to measure the star-formation rates (SFRs) of eight X-ray detected Active Galactic Nuclei (AGNs) in a z~3.1 protocluster, four of which reside in extended Ly-alpha haloes (often termed Ly-alpha blobs: LABs). Three of the AGNs are detected by ALMA and have implied SFRs of ~220-410~M_sun/yr; the non detection of the other five AGNs places SFR upper limits of 100 kpc) do not host more luminous star formation than the smaller LABs, despite being an order of...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1601.00682
13
13
Jun 28, 2018
06/18
Jun 28, 2018
by
N. K. Hine; J. E. Geach; D. M. Alexander; B. D. Lehmer; S C. Chapman; Y. Matsuda
texts
eye 13
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The over-dense environments of protoclusters of galaxies in the early Universe (z>2) are expected to accelerate the evolution of galaxies, with an increased rate of stellar mass assembly and black hole accretion compared to co-eval galaxies in the average density `field'. These galaxies are destined to form the passive population of massive systems that dominate the cores of rich clusters today. While signatures of accelerated growth of galaxies in the SSA22 protocluster (z=3.1) have been...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1506.05115
11
11
Jun 27, 2018
06/18
Jun 27, 2018
by
C. Saez; B. D. Lehmer; F. E. Bauer; D. Stern; A. Gonzales; I. Rreza; D. M. Alexander; Y. Matsuda; J. E. Geach; F. A. Harrison; T. Havashino
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eye 11
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We present VLT VIMOS, Keck DEIMOS and Keck LRIS multi-object spectra of 367 sources in the field of the z ~ 3.09 protocluster SSA22. Sources are spectroscopically classified via template matching, allowing new identifications for 206 extragalactic sources, including 36 z > 2 Lyman-break galaxies (LBGs) and Lyman-\alpha\ emitters (LAEs), 8 protocluster members, and 94 X-ray sources from the ~ 400 ks Chandra deep survey of SSA22. Additionally, in the area covered by our study, we have...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1504.00737
41
41
Sep 22, 2013
09/13
Sep 22, 2013
by
Ian Smail; B. D. Lehmer; R. J. Ivison; D. M. Alexander; R. G. Bower; J. A. Stevens; J. E. Geach; C. A. Scharf; K. E. K. Coppin; W. J. M. van Breugel; .
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eye 41
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We analyse a 100-ks Chandra observation of the powerful radio galaxy, 4C60.07 at z=3.79. We identify extended X-ray emission with Lx~10^45 erg/s across a ~90-kpc region around the radio galaxy. The energetics of this X-ray halo and its morphological similarity to the radio emission from the galaxy suggest that it arises from inverse Compton (IC) scattering, by relativistic electrons in the radio jets, of Cosmic Microwave Background photons and potentially far-infrared photons from the dusty...
Source: http://arxiv.org/abs/0908.0819v1
41
41
Sep 19, 2013
09/13
Sep 19, 2013
by
B. D. Lehmer; D. M. Alexander; F. E. Bauer; W. N. Brandt; A. D. Goulding; L. P. Jenkins; A. Ptak; T. P. Roberts
texts
eye 41
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We present new Chandra observations that complete a sample of seventeen (17) luminous infrared galaxies (LIRGs) with D < 60 Mpc and low Galactic column densities of N_H < 5 X 10^20 cm^-2. The LIRGs in our sample have total infrared (8-1000um) luminosities in the range of L_IR ~ (1-8) X 10^11 L_sol. The high-resolution imaging and X-ray spectral information from our Chandra observations allow us to measure separately X-ray contributions from active galactic nuclei (AGNs) and normal galaxy...
Source: http://arxiv.org/abs/1009.3943v1
