A5039397040- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Advanced Computational Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Advanced Data Storage Technologies
- Galaxies: Formation, Evolution, Phenomena
- Distributed and Parallel Computing Systems
- Scientific Computing and Data Management
- Medical Imaging Techniques and Applications
- Astro and Planetary Science
- Advanced Database Systems and Queries
- Scientific Research and Discoveries
- Environmental Monitoring and Data Management
- Astrophysical Phenomena and Observations
- Particle Detector Development and Performance
- Research Data Management Practices
- Adaptive optics and wavefront sensing
- Computational Physics and Python Applications
- Pulsars and Gravitational Waves Research
- Radio Wave Propagation Studies
- Radiomics and Machine Learning in Medical Imaging
- Dark Matter and Cosmic Phenomena
Goddard Space Flight Center
2003-2019
Universities Space Research Association
1997-2002
Space Telescope Science Institute
1985-1990
Institute of Astronomy
1984-1985
University of Cambridge
1985
Princeton University
1980
EXOSAT observations of the spectrum Seyfert 1 galaxy MKN 841 show that it is well-fitted by a power law photon index 1.6, similar to other Seyferts, and large additional soft component. The X-ray luminosity over observed band exceeds |$4\times{10}^{44}\,\text{erg}\,\text{s}^{-1}$|. A single-temperature blackbody fit X-rays short-wavelength ultraviolet continuum gives |$2\times{10}^{46}\,\text{erg}\,\text{s}^{-1}$| while an accretion disc fitted same points...
We report the observation by Compton Gamma Ray Observatory of a spectacular flare radio source PKS 1622-297. A peak flux (17 ± 3) × 10-6 cm-2 s-1 (E > 100 MeV) was observed. The corresponding isotropic luminosity is 2.9 1049 ergs s-1. find that 1622-297 exhibits γ-ray intraday variability. increase factor at least 3.6 observed to occur in less than 7.1 hr (with 99% confidence). Assuming an exponential rise, doubling time 3.8 hr. significant decrease ~2 9.7 also Without beaming, rapid change...
view Abstract Citations (139) References (51) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Dissipationless collapse of galaxies and initial conditions McGlynn, T. A. This paper reports on the results a number simulations dissipationless using new numerical methods which permit achievement high central densities. A total 64 were run, starting from wide range conditions. The density velocity profiles show strong dependence kinetic energy particles, but...
view Abstract Citations (47) References (22) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On the Nondetection of Extrasolar Comets McGlynn, Thomas A. ; Chapman, Robert D. This paper reports on calculations expected rate for discovery comets with significantly hyperbolic orbits, including corrections observability these comets. Using current standard models formation comets, a significant number such should have been observed. lack detection extrasolar is...
We report the discovery of a nearby star with very large proper motion 505 ± 003 yr-1. The is called SO 025300.5+165258 and referred to herein as high (HPMS). came result search SkyMorph database, sensitive persistent survey that well suited for finding stars motions. There are currently only seven known motions greater than 5'' spectrum measured tangential velocity indicate HPMS main-sequence spectral type M6.5. Trigonometric photometric parallaxes have been determined, yielding distance...
Collisions between clusters of galaxies are investigated to determine whether the systems will survive their first encounter. Numerical simulations show that two can pass through one another without destroying individual optical components. The gas in be strongly affected and cooling flows them may disrupted.
view Abstract Citations (52) References (34) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Remnants of Strong Tidal Interactions McGlynn, Thomas A. This paper examines the properties stellar systems that have recently undergone a strong tidal shock, i.e., shock which removes significant fraction particles in system, and where shocked system has much smaller mass than producer field. N-body calculations King models variety fashions were performed,...
We describe an online system for automated classification of X-ray sources, ClassX, and we present preliminary results the three major catalogs ROSAT All-Sky Survey (RASS) Bright Source Catalog, RASS Faint WGACAT, into six class categories: stars, white dwarfs, binaries, galaxies, active galactic nuclei, clusters galaxies. ClassX is based on a machine-learning technology. It represents classifiers, each classifier consisting considerable number oblique decision trees. These trees are built...
The Optical Monitor Catalog of serendipitous sources (OMCat) contains entries for every source detected in the publicly available XMM-Newton (OM) images taken either imaging or "fast" modes. Since OM is coaligned and records data simultaneously with X-ray telescopes on XMM-Newton, it typically produces one more near-UV optical bands pointing observatory. As beginning 2006, public archive had covered roughly 0.5% sky 2950 fields. OMCat not dominated by previously undetected at other...
Mosquito-borne diseases pose a significant threat in many Southeast Asian countries, particularly through the sylvatic cycle, which has wildlife reservoir forests and rural areas. Studying composition diversity of vectors pathogen transmission is especially challenging areas due to their remoteness, limited accessibility, lack power, underdeveloped infrastructure. This study based on WHO mosquito sampling protocol, modifies technical details support collection difficult-to-access...
view Abstract Citations (38) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Galactic cannibalism. IV. The evidence-correlations between dynamical time scales and Bautz-Morgan type. McGlynn, T. A. ; Ostriker, J. P. A correlation times the difference magnitudes of first second brightest cluster members is expected if luminosity supergiant cD galaxies sequence galaxy types result from evolutionary processes. Data 15 Abel clusters supports this...
The US Virtual Astronomical Observatory was a software infrastructure and development project designed both to begin the establishment of an operational (VO) provide coordination with international VO effort. concept is means by which astronomer able discover, access, process data seamlessly, regardless its physical location. This paper describes origins VAO, including predecessor efforts within National Observatory, summarizes main accomplishments. These accomplishments include scripting...
The SkyView virtual observatory provides a single, simple interface where users can retrieve images of the sky at all wavelengths from radio through gamma rays. Below we discuss how works and it represents new paradigm in astronomical data archives. Users get to over WorldWideWeb http://skyview.gsfc.nasa.gov . Within few moments they have high-quality ground- or satellite-based surveys.
NASA regards data handling and archiving as an integral part of space missions, has a strong track record serving astrophysics to the public, beginning with IRAS satellite in 1983. Archives enable major science return on significant investment required develop mission. In fact, presence accessibility archive can more than double number papers resulting from data. order for community be able use data, they have find (ease access) interpret use). Funding archival research (e.g., ADAP program)...
view Abstract Citations (23) References (33) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS X-Ray Studies of Galactic and Intergalactic Gas in the Pegasus I Cluster Canizares, C. R. ; Donahue, M. E. Trinchieri, G. Stewart, McGlynn, T. A. Observations with Einstein Observatory IPC reveal hot gas a low-density intergalactic medium galactic within each dominant elliptical galaxies NGC 7619 7626. The have X-ray luminosities 8 3×1041ergs s-1 respectively,...
The effect of treatment with the beta-blocker metoprolol on several indicants task performance was investigated. Twenty-five male hypertensives were treated for 2 weeks each drug and placebo in a double-blind crossover design. Comparisons to 25 matched untreated normotensives made. Participants responded twice Mood Adjective Check List (MACL) Stroop Color-Word Test. In addition, they participated two parallel decision-making simulations. Normotensives or did not differ MACL scores. 12...
We describe observations of the quasi-stellar object (QSO) NRAO 190 during a gamma-ray flare from 1994 August 9 to 29. This QSO was serendipitously detected by EGRET instrument on Compton Gamma Ray Observatory in with luminosity at least 10 times that its quiescent state. Optical, radio, and microwave data were obtained or near observations.