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- Goddard Space Flight CenterUS129 papers
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7 papers · 2 filters
Some recent developments in gamma-ray burst afterglow and prompt emission models
Bing Zhang, Peter Meszaros, Junfeng Wang
Extensive observational campaigns of afterglow hunting have greatly enriched our understanding of the gamma-ray burst (GRB) phenomenon. Efforts have been made recently to explore s…
Feeding the active nucleus of NGC 1097
Thaisa Storchi-Bergmann, Rodrigo Nemmen da Silva, Michael Eracleous
We discuss the signatures of an evolving accretion disk around the nucleus of NGC 1097, based on observations of its double-peaked H-alpha emission-line profile which cover a time…
X-ray emission from the most luminous z>4 Palomar Digital Sky Survey Quasars: the Chandra view
C. Vignali, W. N. Brandt, D. P. Schneider +2
We present the results obtained from exploratory Chandra observations of nine high-redshift (z=4.09-4.51) quasars, selected from among the optically brightest Palomar Digital Sky S…
Radio pulsar death
Bing Zhang
Pulsar radio emission is believed to be originated from the electron-positron pairs streaming out from the polar cap region. Pair formation, an essential condition for pulsar radio…
Pulsar Wind Nebulae and Particle Acceleration in the Pulsar Magnetosphere
S. Shibata, M. Tomatsuri, M. Shimanuki +3
This paper deals with the Crab Nebula problem to suggest that particle acceleration takes place not only at the inner shock but also over a larger region in the nebula with disorde…
X-rays from star-forming regions: New objects, new physics, new visions
T. Montmerle, N. Grosso, E. D. Feigelson +1
Star-forming regions have been the targets of X-ray observations since the dawn of satellite X-ray astronomy. The increase in sensitivity and/or spatial resolution offered by XMM-N…