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20 papers · 2 filters
A generic method to constrain the dark matter model parameters from Fermi observations of dwarf spheroids
Yue-Lin Sming Tsai, Qiang Yuan, Xiaoyuan Huang
Observation of gamma-rays from dwarf galaxies is an effective way to search for particle dark matter. Using 4-year data of Fermi-LAT observations on a series of Milky Way satellite…
Is There a Relation between Duration and E_iso in Gamma-Ray Bursts?
Shu-Jin Hou, Tong Liu, Da-Bin Lin +2
The system of accretion disk and black hole is usually considered as the central engine of Gamma-ray Bursts (GRBs). It is usually thought that the disk in the central engine of GRB…
On the Hadronic Gamma-ray Emission from Tycho's Supernova Remnant
Xiao Zhang, Yang Chen, Hui Li +1
Hadronic gamma-ray emission from supernova remnants (SNRs) is an important tool to test shock acceleration of cosmic ray protons. Tycho is one of nearly a dozen Galactic SNRs which…
A Comprehensive Study of Gamma-Ray Burst Optical Emission: II. Afterglow Onset and Late Re-Brightening Components
En-Wei Liang, Liang Li, He Gao +12
We continue our systematic statistical study of various components in gamma-ray burst (GRB) optical lightcurves. We decompose the early onset bump and the late re-brightening bump…
Chandra-HETGS Observations of the Brightest Flare Seen from Sgr A*
M. A. Nowak, J. Neilsen, S. B. Markoff +10
Starting in 2012, we began an unprecedented observational program focused on the supermassive black hole in the center of our Galaxy, Sgr A*, utilizing the High Energy Transmission…
GRB 110721A: photosphere "death line" and the physical origin of the GRB "Band" function
Bing Zhang, Rui-Jing Lu, En-Wei Liang +1
The prompt emission spectra of gamma-ray bursts (GRBs) usually have a dominant component that is well described by a phenomenological "Band" function. The physical origin of this s…