A5109142962- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Medical Imaging Techniques and Applications
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Radiation Detection and Scintillator Technologies
- Radio Astronomy Observations and Technology
- Computational Physics and Python Applications
- Astronomical Observations and Instrumentation
- Scientific Computing and Data Management
- Particle Accelerators and Free-Electron Lasers
- Solar and Space Plasma Dynamics
- Nuclear Physics and Applications
- Geophysics and Gravity Measurements
- Pulsars and Gravitational Waves Research
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- History and Developments in Astronomy
- Atmospheric Ozone and Climate
- Atomic and Subatomic Physics Research
- Chemical Reactions and Isotopes
University of Wisconsin–Madison
2024
University of Colorado Anschutz Medical Campus
2022
Grand Forks Air Force Base
2018
Goddard Space Flight Center
1993-2011
Southern University and Agricultural and Mechanical College
2002-2006
Louisiana State University
1998-2006
University of New Hampshire at Manchester
2005
Southern States University
1998-2005
Southern University System
2000
University of New Hampshire
1993-1998
The all-sky survey in high-energy gamma rays (E$>$30 MeV) carried out by the Energetic Gamma Ray Experiment Telescope (EGRET) aboard Compton Gamma-Ray Observatory provides a unique opportunity to examine detail diffuse gamma-ray emission. observed emission has Galactic component arising from cosmic-ray interactions with local interstellar gas and radiation as well an almost uniformly distributed that is generally believed originate outside Galaxy. Through careful study removal of emission,...
view Abstract Citations (201) References (82) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Diffuse Gamma-Ray Emission in the Galactic Plane from Cosmic-Ray, Matter, and Photon Interactions Bertsch, D. L. ; Dame, T. M. Fichtel, C. E. Hunter, S. Sreekumar, P. Stacy, J. G. Thaddeus, On basis of spatial distribution, intensity, energy spectrum, diffuse high-energy gamma radiation is believed to be result cosmic-ray interactions with matter, a lesser extent...
We present the first detection of gamma-ray emission from extragalactic source PKS 2155-304, which is often considered to be a prototype X-ray-selected BL Lacertae objects. The 30 MeV-10 GeV photon spectrum derived measurements taken with EGRET on Compton Observatory during 1994 November 15-29 indicates very hard power-law spectral index 1.71 ± 0.24. This hardness when combined proximity (z = 0.116) makes it an excellent candidate for at TeV energies. briefly discuss implications these models Lac
The primary scientific mission of the Black Hole Finder Probe (BHFP), part NASA Beyond Einstein program, is to survey local Universe for black holes over a wide range mass and accretion rate. One approach such hard X-ray coded-aperture imaging operating in 10-600 keV energy band, spectral that considered be especially useful detection hole sources. development new inorganic scintillator materials provides improved performance (for example, with regards resolution timing) well suited BHFP...
The primary scientific mission of the Black Hole Finder Probe (BHFP), part NASA Beyond Einstein program, is to survey local Universe for black holes over a wide range mass and accretion rate. One approach such hard X-ray coded-aperture imaging operating in 10-600 keV energy band, spectral that considered be especially useful detection hole sources. development new inorganic scintillator materials provides improved performance (for example, with regards resolution timing) well suited BHFP...
We present a comprehensive report on the high-energy properties of γ-ray blazar PKS 0208-512 as observed with EGRET and Imaging Compton Telescope (COMPTEL) Gamma Ray Observatory (CGRO), spanning entire nine-year mission (1991-2000). More high-significance detections were recorded (nine at greater than 6 σ confidence) for any other blazar. On timescales weeks to months, is one five most variable blazars. find statistically significant correlation between intensity spectral index 0208-512,...
The MEGA mission would enable a sensitive all-sky survey of the medium-energy -ray sky .This will bridge huge sensitivity gap between COMPTEL and OSSE experiments on Compton Gamma Ray Observatory, SPI IBIS instruments INTEGRAL visionary ACT mission.It will, among other things, serve to compile much larger catalog sources in this energy range, perform far deeper searches for supernovae, better measure galactic continuum emission as well identify components cosmic diffuse emission.The large...
The Medium Energy Gamma-ray Astronomy (MEGA) telescope concept will soon be proposed as a MIDEX mission. This mission would enable sensitive all-sky survey of the medium-energy gamma-ray sky (0.4 - 50 MeV) and bridge huge sensitivity gap between COMPTEL OSSE experiments on Compton Gamma Ray Observatory, SPI IBIS instruments INTEGRAL, visionary Advanced Telescope (ACT) scientific goals include, among other things, compiling much larger catalog sources in this energy range, performing far...
Background: Leadless pacemakers (LPM) utilization has grown significantly, yet data on LPM removal and/or revision (LPM-RR) remains limited. This study aims to evaluate trends in 30-day readmission rate (30-dRr), mortality, and resource associated with LPM-RR Method: We analyzed from the Nationwide Readmission Database 2016 2021. Patients ≥ 18 years who underwent were identified using ICD-10 codes. The primary outcome was trend 30-dRr following LPM-RR. Secondary outcomes included (Length of...
The Medium Energy Gamma-ray Astronomy (MEGA) telescope concept will soon be proposed as a MIDEX mission. This mission would enable sensitive all-sky survey of the medium-energy gamma-ray sky (0.4–50 MeV) and bridge huge sensitivity gap between COMPTEL OSSE experiments on Compton Gamma Ray Observatory visionary Advanced Telescope (ACT) scientific goals include compiling much larger catalog sources in this energy range, performing far deeper searches for supernovae, better measuring galactic...
view Abstract Citations (6) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Diffuse Galactic Continuum Emission Measured by COMPTEL and the Cosmic-Ray Electron Spectrum Strong, A. W. ; Diehl, R. Schoenfelder, V. Varendorff, M. Youssefi, G. Bloemen, H. Hermsen, de Vries, C. Morris, D. Stacy, J. Bennett, K. galactic continuum gamma-ray emission in 0.75-30 MeV range from inner Galaxy has been studied using data on Compton Gamma-Ray Observatory....
The primary scientific mission of the black hole finder probe (BHFP), part NASA Beyond Einstein program, is to survey local Universe for holes over a wide range mass and accretion rate. One approach such hard X-ray coded-aperture imaging operating in 10-600 keV energy hand, spectral that considered be especially useful detection sources. development new inorganic scintillator materials provides improved performance (for example, with regards resolution timing) well suited BHFP science...
MARGIE (Minute-of-Arc Resolution Gamma-Ray Imaging Experiment) will be a large-area (-4O cm2), wide field-ofview ('-26° half-angle), hard X-ray/gamma-ray imaging telescope capable of providing accurate positions for faint gamma-ray bursts in near-real-time and performing sensitive survey both steady transient cosmic sources.The instrument is designed to image at the low-intensity (high-redshift) end log Nlog S distribution.MARGIE was recently selected by NASA mission-concept study an Ultra...
Data acquired with the COBE Differential Microwave Radiometer (DMR) provide a unique opportunity to observe simultaneous emission from cosmic gamma-ray bursts in previously unexplored microwave region of spectrum. We have searched DMR time-ordered data sets for instances when one horns (FWHM ~ 7°) was pointing direction burst at time occurrence. During overlap period 1991 April-December corresponding first public release data, 210 Compton Gamma Ray Observatory (CGRO)/BATSE listed Third BATSE...