1,935
1.9K
Jun 12, 2011
06/11
by
NON
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Volume 3 of the 2003 Air Transport Reserch Society (ATRS) World Conference includes papers on topics relevant to airline operations worldwide. Specific topics include: European Union and civil aviation regimens;simulating decision making in airline operations, passenger points of view on convenient airports; route monopolies and nonlinear pricing; cooperation among airports in Europe; fleet modernizaiton in Brazil;the effects of deregulation on the growth of air transportation in Europe and the...
Topics: ATOMIC PHYSICS, X RAYS, NUCLEAR PHYSICS, SEYFERT GALAXIES, PHOTOABSORPTION, LINE OF SIGHT
207
207
May 29, 2011
05/11
by
Maestrello, Luci
texts
eye 207
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Three unrelated experiments are discussed; each was extremely sensitive to initial conditions. The initial conditions are the beginnings of the origins of the information that nonlinearity displays. Initial conditions make the phenomenon unstable and unpredictable. With the knowledge of the initial conditions, active control requires far less power than that present in the system response. The first experiment is on the control of shocks from an axisymmetric supersonic jet; the second, control...
Topics: X RAYS, EMISSION, IONIZATION, ACTIVE GALACTIC NUCLEI, SEYFERT GALAXIES, LUMINOSITY, NUCLEAR...
267
267
May 26, 2011
05/11
by
Hughes, W. Jeffre
texts
eye 267
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This grant funded several studies of magnetospheric substorms and their effect on the dynamics of the earth's geomagnetic tail. We completed an extensive study of plasmoids, plasma/magnetic field structures that travel rapidly down the tail, using data from the ISEE 3 and IMP 8 spacecraft. This study formed the PhD thesis of Mark Moldwin. We found that magnetically plasmoids are better described as flux-ropes (twisted magnetic flux tubes) rather than plasma bubbles, as had been generally...
Topics: CLOUDS (METEOROLOGY), ACTIVE GALACTIC NUCLEI, DENSITY (MASS/VOLUME), ATMOSPHERIC MODELS,...
622
622
Jun 3, 2011
06/11
by
Soeder, Ronald H.; Roeder, James W.; Stark, David E.; Linne, Alan A
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This report describes criteria for the design, analysis, quality assurance, and documentation of models that are to be tested in the wind tunnel facilities at the NASA Glenn Research Center. This report presents two methods for computing model allowable stresses on the basis of the yield stress or ultimate stress, and it defines project procedures to test models in the NASA Glenn aeropropulsion facilities. Both customer-furnished and in-house model systems are discussed. The functions of the...
Topics: X RAYS, THERMAL EMISSION, SEYFERT GALAXIES, K LINES, X RAY ASTROPHYSICS FACILITY, GAMMA RAYS
531
531
Jun 12, 2011
06/11
by
Trinh, Huu; Chen, C. P
texts
eye 531
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Recent experimental investigations and physical modeling studies have indicated that turbulence behaviors within a liquid jet have considerable effects on the atomization process. For certain flow regimes, it has been observed that the liquid jet surface is highly turbulent. This turbulence characteristic plays a key role on the breakup of the liquid jet near to the injector exit. Other experiments also showed that the breakup length of the liquid core is sharply shortened as the liquid jet is...
Topics: ASTRONOMICAL MODELS, SEYFERT GALAXIES, K LINES, EMISSION SPECTRA, X RAY TIMING EXPLORER,...
We report on two XMM-Newton observations of the bright Narrow-Line Seyfert 1 galaxy Ark 564 taken one year apart (2000 June and 2001 June). The 0.6-10 keV continuum is well described by a soft blackbody component (kT - 140-150 eV) plus a steep power law (Gamma - 2.50-2.55). No significant spectral changes are observed between the two observations, although the X-ray flux in the second observation is - 40-50 per cent lower. In both observations we detect a significant absorption edge at a...
Topics: NASA Technical Reports Server (NTRS), SEYFERT GALAXIES, LINE SPECTRA, XMM-NEWTON TELESCOPE, IRON,...
369
369
May 24, 2011
05/11
by
Roberts, S. G.; Hutchinson, T. M.; Arnaud, S. B.; Kiratli, B. J; Steele, C. R
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eye 369
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Accurate non-invasive mechanical measurement of long bones is made difficult by the masking effect of surrounding soft tissues. Mechanical response tissue analysis (MRTA) offers a method for separating the effects of the soft tissue and bone; however, a direct validation has been lacking. A theoretical analysis of wave propagation through the compressed tissue revealed a strong mass effect dependent on the relative accelerations of the probe and bone. The previous mathematical model of the bone...
Topics: SPIRAL GALAXIES, CONFERENCES, SEYFERT GALAXIES, INTERSTELLAR MATTER, BLACK HOLES (ASTRONOMY),...
A statistical criterion has been proposed to reveal the random and physical clusterings among stars, galaxies and other objects. This criterion has been applied to the galaxy triples of the list by Karachentseva, Karaschentsev and Scherbanovsky, and the double galaxies of the list by Dahari where the primary components are the Seyfert galaxies. The confident physical, probable physical, probable optical and confident optical groups have been identified. The limit difference of radial velocities...
Topics: NASA Technical Reports Server (NTRS), CLASSIFICATIONS, GALACTIC CLUSTERS, SEYFERT GALAXIES,...
102
102
Jun 11, 2011
06/11
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DesMarais, D. J
texts
eye 102
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The physical and chemical interactions between the atmosphere, hydrosphere, geosphere and biosphere can be examined for elements such as carbon (C) and sulfur (S) that have played central roles for both life and the environment. The compounds of C are highly important, not only as organic matter, but also as atmospheric greenhouse gases, pH buffers in seawater, oxidation-reduction buffers virtually everywhere, and key magmatic constituents affecting plutonism and volcanism. S assumes important...
Topics: SEYFERT GALAXIES, IONIZED GASES, EXTRATERRESTRIAL MATTER, EMISSION SPECTRA, X RAY SOURCES, X RAYS,...
310
310
May 23, 2011
05/11
by
Rubinstein, Robert; Erlebacher, Gordo
texts
eye 310
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A theory of transport coefficients in weakly compressible turbulence is derived by applying Yoshizawa's two-scale direct interaction approximation to the compressible equations of motion linearized about a state of incompressible turbulence. The result is a generalization of the eddy viscosity representation of incompressible turbulence. In addition to the usual incompressible eddy viscosity, the calculation generates eddy diffusivities for entropy and pressure, and an effective bulk viscosity...
Topics: INFRARED RADIATION, ACTIVE GALACTIC NUCLEI, CORONAS, SEYFERT GALAXIES, EMISSION SPECTRA, HIGH...
The launch of {\em Fermi} produced a significant number of AGN detections to allow statistical treatment of their properties. One of the first such systematics was the "Blazar Divide" in FSRQs and BL Lacs according to their gamma-ray spectral index and luminosity. Further data accumulation indicated this separation to be less clear than thought before. An MHD wind model which can model successfully the Seyfert X-ray absorber properties provides the vestiges of an account of the...
Topics: NASA Technical Reports Server (NTRS), BLAZARS, MAGNETOHYDRODYNAMICS, SPECTRAL BANDS, GAMMA RAYS,...
578
578
Jul 26, 2010
07/10
by
NON
texts
eye 578
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The workshop brought together researchers involved in the NASA formal methods research effort for detailed technical interchange and provided a mechanism for interaction with representatives from the FAA and the aerospace industry. The workshop also included speakers from industry to debrief the formal methods researchers on the current state of practice in flight critical system design, verification, and certification. The goals were: define and characterize the verification problem for...
Topics: COMPACT GALAXIES, SPECTROSCOPY, STARS, COSMOLOGY, GALACTIC CLUSTERS, GRAVITATIONAL EFFECTS,...
362
362
May 22, 2011
05/11
by
Rivera, Jorge E.; Bowen, Barry C.; Davis, J. Bradley; Speece, Robert F
texts
eye 362
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A debris/ice/thermal protection system assessment and integrated photographic analysis was conducted for Shuttle mission STS-68. Debris inspections of the flight elements and launch pad were performed before and after launch. Icing conditions on the External Tank were assessed by the use of computer programs, nomographs, and infrared scanner data during cryogenic loading of the vehicle followed by on-pad visual inspection. High speed photography of the launch was analyzed to identify ice/debris...
Topics: SEYFERT GALAXIES, X RAY ASTRONOMY, X RAY BINARIES, X RAY SPECTRA, FIELD OF VIEW, IRON, OXYGEN,...
349
349
May 31, 2011
05/11
by
Patt, Frederick S
texts
eye 349
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The navigation algorithms for the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) were designed to meet the requirement of 1-pixel accuracy-a standard deviation (sigma) of 2. The objective has been to extract the best possible accuracy from the spacecraft telemetry and avoid the need for costly manual renavigation or geometric rectification. The requirement is addressed by postprocessing of both the Global Positioning System (GPS) receiver and Attitude Control System (ACS) data in the...
Topics: SEYFERT GALAXIES, IRON, GINGA SATELLITE, CENTROIDS, ACCRETION DISKS, X RAYS, PHOTOIONIZATION, K...
466
466
May 29, 2011
05/11
by
Asbury, Scott C.; Yetter, Jeffrey A
texts
eye 466
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The NASA Langley Configuration Aerodynamics Branch has conducted an experimental investigation to study the static performance of innovative thrust reverser concepts applicable to high-bypass-ratio turbofan engines. Testing was conducted on a conventional separate-flow exhaust system configuration, a conventional cascade thrust reverser configuration, and six innovative thrust reverser configurations. The innovative thrust reverser configurations consisted of a cascade thrust reverser with...
Topics: ACTIVE GALACTIC NUCLEI, SEYFERT GALAXIES, LINE SPECTRA, X RAY ASTRONOMY, SPACE OBSERVATIONS (FROM...
The purpose of the grant was to obtain and analyze International Ultraviolet Explorer (IUE) spectra of the spiral galaxy NGC 4395, which contains the nearest and least luminous known Seyfert nucleus. The ultraviolet (UV) spectra was to be used to test the intriguing hypothesis that the 'activity' could be explained by purely stellar phenomena, and to further explore the unprecedented properties of this nucleus. To test the feasibility of the project (the nucleus of NGC 4395 is very faint), one...
Topics: NASA Technical Reports Server (NTRS), SEYFERT GALAXIES, SPIRAL GALAXIES, STELLAR ACTIVITY,...
233
233
May 31, 2011
05/11
by
Wadcock, Alan J.; Yamauchi, Gloria K
texts
eye 233
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A full-span 0.25-scale V-22 tiltrotor was tested in the NASA Ames 40-by 80-Foot Wind Tunnel in November 2000. The main objective of the test was to acquire a comprehensive database to validate tiltrotor analyses. Figure 1 shows the model installed in the Ames 40- by 80-Foot Wind Tunnel. Rotor and vehicle performance measurements were taken in addition to wing pressures, acoustics, and flow visualization. A dual acoustic traverse system was installed to measure blade-vortex interaction (BVI)...
Topics: SEYFERT GALAXIES, X RAY ASTROPHYSICS FACILITY, X RAYS, X RAY SOURCES, PHOTONS, THERMAL EMISSION,...
Mkn 110 is a bright, nearby Seyfert 1 galaxy, which underwent a long optical monitoring campaign, during the past 12 years. Optical observations show that Mkn 110 vary, both in flux and spectral shape. The intensity and width of its Broad Emission Lines (BELs) also vary, from typical Seyfert 1, to typical Narrow Line Seyfert 1 (NLSyl) values, so suggesting that this could be the first supermassive black holes where accretion state related transitions, as frequently observed in stellar-size...
Topics: NASA Technical Reports Server (NTRS), SEYFERT GALAXIES, VISUAL OBSERVATION, X RAY SPECTRA, EMISSION...
192
192
May 24, 2011
05/11
by
Kanavarioti, Anastassi
texts
eye 192
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Phosphoimidazolide activated ribomononucleotides (pN) are useful substrates for the non-enzymatic synthesis of polynucleotides. However, dilute neutral aqueous solutions of pN typically yield small amounts of dimers and traces of polymers; most of pN hydrolyzes to yield nucleoside 5'-monophosphate. Here we report the self-condensation of nucleoside 5'-phosphate 2- methylimidazolide (2-MeImpN with N = cytidine, uridine or guanosine) in the presence of Mg2() in concentrated solutions, such as...
Topics: ACTIVE GALACTIC NUCLEI, QUASARS, PHOTONS, EMISSION, ANNIHILATION REACTIONS, ELECTRON-POSITRON...
185
185
Jun 2, 2011
06/11
by
Nelson, Nor
texts
eye 185
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The Bermuda BioOptics Project (BBOP) is a collaborative effort between the Institute for Computational Earth System Science (ICESS) at the University of California at Santa Barbara (UCSB) and the Bermuda Biological Station for Research (BBSR). This research program is designed to characterize light availability and utilization in the Sargasso Sea, and to provide an optical link by which biogeochemical observations may be used to evaluate bio-optical models for pigment concentration, primary...
Topics: SPECTROMETERS, OXYGEN, NEON, H LINES, XMM-NEWTON TELESCOPE, ABUNDANCE, REFLECTION, SEYFERT...
The physical conditions in a high density hydrogen gas heated and ionized by suprathermal protons were investigated, with application to the gas in the nuclear region of Seyfert galaxies. The gas is assumed optically thick to Lyman and Balmer line radiation. Mechanisms by which the radiation from the gas can balance the heating by the fast protons were investigated, and minimum values for the mass of gas were estimated. Under certain conditions, the suprathermal atoms themselves can cool the...
Topics: NASA Technical Reports Server (NTRS), GAS HEATING, HYDROGEN, PROTONS, SEYFERT GALAXIES, INELASTIC...
This award pertains to an RXTE observation of the Seyfert 1 galaxy Akn 120. The purpose of the observation was to measure the Fe-K emission line and the Compton reflection continuum with RXTE, simultaneously with Chandra and XMM. Such measurements can severely constrain accretion disk models of the central engine since the Fe-K line emission and Compton reflection are intimately related in terms of the physics of X-ray reprocessing in optically-thick matter. Akn 120 was selected for this study...
Topics: NASA Technical Reports Server (NTRS), ASTRONOMICAL MODELS, SEYFERT GALAXIES, K LINES, EMISSION...
An investigation into the extended distribution of far-infrared (FIR) emission associated with nearby Seyfert galaxies is made using a set of MEM reconstructions of IRAS Chopped Photometric Channel (CPC) data (Marston 1993). The data is compared to a set of HII/starburst galaxy images similarly processed in order to compare distributions and FIR color properties. It is shown that the central 1 kpc or so of Seyfert galaxies show extended FIR emission. FIR colors suggest that the bulk of this...
Topics: NASA Technical Reports Server (NTRS), INFRARED ASTRONOMY SATELLITE, SEYFERT GALAXIES, STAR...
334
334
May 22, 2011
05/11
by
Robbins, F
texts
eye 334
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In order to identify the error sources that can potentially degrade stabilization performance of the telescope, this summary is offered as a guideline for use in future performance/design analysis and telescope simulation development. This list is not all inclusive but is meant to be a living document that will be updated periodically.
Topics: ASTRONOMICAL PHOTOMETRY, LINE SPECTRA, STELLAR SPECTRA, ASTRONOMICAL POLARIMETRY, ASTRONOMICAL...
The grant "The Evolution of the Quasar Continuum" resulted in over 53 published referred papers and conference proceedings. The more significant of these papers are listed below, and abstracts are attached. The papers address a wide range of issues involving the evolution of quasars, their electromagnetic emissions, and their environment, from nearby low luminosity Seyfert galaxies to quasars at the highest redshifts. Primarily observational in content the work nonetheless included...
Topics: NASA Technical Reports Server (NTRS), STELLAR EVOLUTION, QUASARS, ASTROPHYSICS, RED SHIFT,...
Only one target (RE 1034+393) was awarded to this grant out of the two asked. The work relative to this object has been completed and one paper summarizing the results was prepared for the astronomical literature.
Topics: NASA Technical Reports Server (NTRS), EXTREME ULTRAVIOLET EXPLORER SATELLITE, SEYFERT GALAXIES,...
The environments of galaxies may affect both the presence and nature of the activity in their nuclei. We have undertaken a study of the environments of Seyfert and non-Seyfert Markarian galaxies to investigate the relationship between nuclear activity and external influences on the nucleus (MacKenty 1989; MacKenty, McLean, and Simpson 1990). Previous studies of the environments of Seyfert galaxies suggest a connection between the nature of the activity in the nuclear regions of the galaxy and...
Topics: NASA Technical Reports Server (NTRS), INFRARED ASTRONOMY SATELLITE, MARKARIAN GALAXIES, SEYFERT...
I supported the data reduction and analysis. We found that the source was not as variable as other soft AGN such as the narrow line Sy 1 galaxies (NLSls). The NLSls vary on time scales of days, while the ROSAT data for this target was fairly constant over a week at a time. Thus, it was very important to have a light curve that spanned 60 days as was the case for these ROSAT observations because the power spectral distribution can be established to very low frequencies that are rarely measured.
Topics: NASA Technical Reports Server (NTRS), DATA REDUCTION, DATA ACQUISITION, SEYFERT GALAXIES, ROSAT...
The occurrence and quantitative properties of Seyfert 1 and Seyfert 2 galaxies as a function of the galaxy environment were studied in a systematic way. For this investigation the authors selected from the Catalogue of Quasars and Active Nuclei (Veron & Veron, 1989) all Seyfert galaxies with the following properties: (1) m sub V less than or equal to 15; (2) listed classification as Sey 1, Sey 2, or Sey 3; (3) v sub rad less than or equal to 20,000 km s(sup -1). This results in a sample...
Topics: NASA Technical Reports Server (NTRS), CLASSIFICATIONS, CORRELATION, MORPHOLOGY, SEYFERT GALAXIES,...
The results of the proposal to (1) carry out data analysis of some carefully selected Seyfert sources, and (2) construct physical models for radiation from these objects and carry out comparison with the observed data are reported.
Topics: NASA Technical Reports Server (NTRS), SEYFERT GALAXIES, X RAYS, MODELS, LINE SPECTRA, X RAY...
281
281
Jun 12, 2011
06/11
by
Zhu, Dongming; Choi, Sung R.; Miller, Robert A
texts
eye 281
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Thermal barrier coatings will be more aggressively designed to protect gas turbine engine hot-section components in order to meet future engine higher fuel efficiency and lower emission goals. There is a need to characterize the fundamental sintering and fracture behavior of the current ZrO2-(7 to 8)wt%Y2O3 coating, in order to fully take advantage of the coating capability. In addition, a thorough evaluation of the coating behavior and temperature limits will be useful for more accurately...
Topics: SEYFERT GALAXIES, ULTRAVIOLET RADIATION, X RAYS, STARBURST GALAXIES, EMISSION SPECTRA, FAR INFRARED...
219
219
Jun 1, 2011
06/11
by
Ahmad, Z.; Bhartia, P. K.; Krotkov, N
texts
eye 219
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We use a Plane-Parallel Cloud (PPC) model to illustrate how Mie scattering from cloud particles interacts with Rayleigh scattering in the atmosphere and produces a complex wavelength dependence in the top-of-the-atmosphere (TOA) reflectances measured by satellite instruments that operate in the ultraviolet (UV) part of the spectrum. Comparisons of the PPC model-derived spectral dependence of reflectances with the Total Ozone Mapping Spectrometer (TOMS) measurements show surprisingly good...
Topics: CATACLYSMIC VARIABLES, X RAY SPECTRA, SEYFERT GALAXIES, VARIABLE STARS, MAGNETIC STARS,...
The soft x ray properties of the Seyfert 2 galaxy NGC 1068 are a crucial test of the 'hidden Seyfert 1' model. It is important to determine whether the soft x rays come from the nucleus, or from a number of other possible regions in the circumnuclear starburst disk. We present preliminary results of a ROSAT HRI observation of NGC 1068 obtained during the verification phase. The fraction of x rays that can be attributed to the nucleus is about 70 percent so the 'soft x ray problem' remains....
Topics: NASA Technical Reports Server (NTRS), HIGH RESOLUTION, ROSAT MISSION, SEYFERT GALAXIES, X RAY...
196
196
May 23, 2011
05/11
by
Goldfarb, Michael; Lipsey, James H
texts
eye 196
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A piezoelectric (PZT) stack-based actuator was developed to provide a means of actuation with dynamic characteristics appropriate for small-scale manipulation. In particular, the design incorporates a highly nonlinear, large-ratio transmission that provides approximately two orders of magnitude motion amplification from the PZT stack. In addition to motion amplification, the nonlinear transmission was designed via optimization methods to distort the highly non-uniform properties of a...
Topics: MATHEMATICAL MODELS, EXCITATION, HIGH RESOLUTION, IONIZATION POTENTIALS, SEYFERT GALAXIES, ELECTRON...
349
349
May 23, 2011
05/11
by
Pate-Cornell, Elisabeth; Sachon, Mar
texts
eye 349
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The risk of EVAs is critical to the decision of whether or not to automate a large part of the construction of the International Space Station (ISS). Furthermore, the choice of the technologies of the space suit and the life support system will determine (1) the immediate safety of these operations, and (2) the long-run costs and risks of human presence in space, not only in lower orbit (as is the case of the ISS) but also perhaps, outside these orbits, or on the surface of other planets. The...
Topics: STELLAR EVOLUTION, APERTURES, B STARS, CAMERAS, COUNTER ROTATION, GALACTIC BULGE, LATE STARS,...
226
226
May 22, 2011
05/11
by
NON
texts
eye 226
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An apparatus for treating a microporous structure with atomic oxygen is presented. The apparatus includes a main gas chamber for flowing gas in an axial direction and a source of gas, containing atomic oxygen, connected for introducing the gas into the main gas chamber. The apparatus employs at least one side arm extending from the main atomic oxygen-containing chamber. The side arm has characteristic relaxation times such that a uniform atomic oxygen dose rate is delivered to a specimen...
Topics: EMISSION SPECTRA, INTERGALACTIC MEDIA, LINE SPECTRA, PHOTOIONIZATION, GAS COMPOSITION, SEYFERT...
A model is presented which assumes the existence of cold dense clouds near the central engine of Active Galactic Nuclei (AGNs). The effects of such clouds on the observed spectrum are explored. It is shown that this model is consistent with the complicated observed spectra and variability behavior of most extensively studied Seyfert nuclei. The results are compared with other proposed models. The existing observational evidence appears to support the "cloud-model."
Topics: NASA Technical Reports Server (NTRS), CLOUDS (METEOROLOGY), ACTIVE GALACTIC NUCLEI, DENSITY...
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742
Jul 12, 2010
07/10
by
Badgley, P. R.; Irion, C. E.; Myers, D. M
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The multifuel stratified charge rotary engine is discussed. A single rotor, 0.7L/40 cu in displacement, research rig engine was tested. The research rig engine was designed for operation at high speeds and pressures, combustion chamber peak pressure providing margin for speed and load excursions above the design requirement for a high is advanced aircraft engine. It is indicated that the single rotor research rig engine is capable of meeting the established design requirements of 120 kW, 8,000...
Topics: ACTIVE GALACTIC NUCLEI, PHOTOIONIZATION, QUASARS, X RAY ANALYSIS, RADIO SOURCES (ASTRONOMY),...
Spectral modeling and variability studies are reported in this paper, including fitting with relativistically blurred ionized-disk models designed to reproduce the radiation spectrum from the inner accretion disk around a black hole. PG 1404+226 is highly variable in flux and has a steep X-ray spectrum that varies over the course of the observation. Its strong observed soft X-ray excess can be well fitted with an ionized-disk model. The parameters derived from this model indicate that the...
Topics: NASA Technical Reports Server (NTRS), ACCRETION DISKS, BLACK HOLES (ASTRONOMY), SEYFERT GALAXIES,...
A letter has been submitted to ApJ, and is in the final stages of revision on the spectral variability of the nuclear source. We presented multiple Chandra and XMM-Newton observations of the Seyfert Galaxy NGC 1365, which shows the most dramatic X-ray spectral changes observed so far in an AGN: the source switched from reflection dominated to Compton- thin and back in just 6 weeks. During this time the soft thermal component, arising from a 1-kpc region around the center, remained constant. The...
Topics: NASA Technical Reports Server (NTRS), MONITORS, SEYFERT GALAXIES, SPECTRUM ANALYSIS, LINE OF SIGHT,...
1,027
1.0K
Jun 1, 2011
06/11
by
Daggett, David L.; Brown, Stephen T.; Kawai, Ron T
texts
eye 1,027
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Engine fan diameter and Bypass Ratio (BPR) optimization studies have been conducted since the beginning of the turbofan age with the recognition that reducing the engine core jet velocity and increasing fan mass flow rate generally increases propulsive efficiency. However, performance tradeoffs limit the amount of fan flow achievable without reducing airplane efficiency. This study identifies the optimum engine fan diameter and BPR, given the advanced Ultra-Efficient Engine Technology (UEET)...
Topics: ULTRAVIOLET SPECTROSCOPY, SPACEBORNE TELESCOPES, ULTRAVIOLET ABSORPTION, X RAY ABSORPTION, X RAY...
At the end of three days' spirited discussion of the type 2 Seyfert galaxy NGC 1068, what do we think we understand about this object? New observations, particularly in the infrared and radio are helping to resolve old problems, while drawing attention to new ones. It appears that NGC 1068 is a relatively normal spiral galaxy in which large-scale gravitational disturbances are funneling matter into the nucleus. A collimated outflow disturbs the interstellar medium out to kiloparsec scales, but...
Topics: NASA Technical Reports Server (NTRS), SPIRAL GALAXIES, CONFERENCES, SEYFERT GALAXIES, INTERSTELLAR...
Progress is described for the following topics: rapid variations in the far ultraviolet spectrum of the cool Ap star 21 Com; elliptical Seyfert galaxies; variations of cool Ap stars with strong magnetic fields; and X-ray selected BL Lac Objects.
Topics: NASA Technical Reports Server (NTRS), ASTRONOMY, BALMER SERIES, MAGNETIC FIELDS, ULTRAVIOLET...
The scanning modulation collimator experiment designed to identify the optical counterparts of celestial X-ray sources is described. Identification of galactic sources is discussed. Results concerning active galaxies are presented.
Topics: NASA Technical Reports Server (NTRS), HEAO 1, OPTICAL MEASUREMENT, X RAY SOURCES, ACTIVE GALAXIES,...
We report X-ray fluxes in the 2-10 keV band from LINERs (low-ionization nuclear emission-line regions) and low-luminosity Seyfert galaxies obtained with the ASCA satellite. Observed X-ray luminosities are in the range between 4 x 10(exp 39) and 5 x 10(exp 41) ergs/s, which are significantly smaller than that of the "classical" low-luminosity Seyfert 1 galaxy NGC 4051. We found that X-ray luminosities in 2-10 keV of LINERs with broad H.alpha emission in their optical spectra (LINER 1s)...
Topics: NASA Technical Reports Server (NTRS), X RAYS, EMISSION, IONIZATION, ACTIVE GALACTIC NUCLEI, SEYFERT...
Some pecularities of the circummucleus of the Seyfert galaxy NGC 7469 were revealed, plausibly caused by interaction with the satellite IC 5283 and a starlike detail, situated on the edge of the west spiral branch 14 seconds from the nucleus. Shock excited H II regions were noted in the part of NGC 7469 turned toward the satellite IC 5283. The galaxy's central radio structure (lambda approx. 6 cm) stretches in the direction toward the satellite IC 5283 and the starlike detail. The spectum and...
Topics: NASA Technical Reports Server (NTRS), EARLY STARS, H II REGIONS, SEYFERT GALAXIES, STAR CLUSTERS,...
Seven epochs of very long baseline radio interferometric observations of the Seyfert galaxies 3C 120 and 3C 84, at 3.8-cm wave length using stations at Westford, Massachusetts, Goldstone, California, Green Bank, West Virginia, and Onsala, Sweden, have been analyzed for source structure. An algorithm for reconstructing the brightness distribution of a spatially confined source from fringe amplitude and so called closure phase data has been developed and successfully applied to artificially...
Topics: NASA Technical Reports Server (NTRS), BRIGHTNESS TEMPERATURE, LUMINOUS INTENSITY, RADIO...
This grant was to support the reduction and analysis of our approved XMM observation of the nearby Seyfert 2 galaxy NGC 5506. The observation has been carried out simultaneously with a BeppoSAX observation of the same source. The proposal was aimed to study in detail the Compton reflection component and the complex Iron K line of this source, combining the still unique capability of BeppoSAX in hard X-rays (to strongly constrain the reflection component, and then the intrinsic nuclear...
Topics: NASA Technical Reports Server (NTRS), SEYFERT GALAXIES, X RAYS, PHOTOIONIZATION, K LINES,...
536
536
May 31, 2011
05/11
by
Dumbacher, Dan L
texts
eye 536
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The Space Launch Initiative (SLI), managed by the Second Generation Reusable Launch Vehicle (2ndGen RLV) Program, was established to examine the possibility of revolutionizing space launch capabilities, define conceptual architectures, and concurrently identify the advanced technologies required to support a next-generation system. Initial Program funds have been allocated to design, evaluate, and formulate realistic plans leading to a 2nd Gen RLV full-scale development (FSD) decision by 2006....
Topics: X RAY IRRADIATION, OXYGEN, NITROGEN, GRAVITATION, CARBON, ACCRETION DISKS, LINE SPECTRA,...
The two galaxies differ markedly in their radio properties. III Zw 2 is a strong source with a highly variable compact component while MK 509 is a very weak source. Both galaxies show significant variations in X-rays and MK 509 has shown variations at optical wavelengths as well. Simultaneous observations were made in the ultraviolet, optical and infrared in order to examine three fundamental aspects of the origin of the continuum emission: are these thermal and nonthermal components; how large...
Topics: NASA Technical Reports Server (NTRS), CONTINUOUS RADIATION, LINE SPECTRA, SEYFERT GALAXIES,...
