Compatibility between gamma-ray burst spectroscopy and source models

1988 ◽  
Author(s):  
I. G. Mitrofanov ◽  
C. Barat
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Burst ◽  
Source Models

Gamma-ray burst measurements at low fluxes

1981 ◽  
Vol 301 (1462) ◽  
pp. 661-663
Keyword(s):  
Power Law ◽  
Gamma Ray ◽  
The Other ◽  
Source Distribution ◽  
Gamma Ray Burst ◽  
Thick Disc ◽  
Other Hand ◽  
Source Models ◽  
Arrival Directions

Recent measurements of the number of cosmic y-ray bursts per year at small flux levels continue to show significant deviations from the N (> S ) S -3/2 power law for the rate N ( > S ) at size S which would apply to a uniform source distribution. In particular Fishman et al. (1978) and Agrawal et al. (1979) find flux limits two orders of magnitude lower than those expected when the Vela (Strong & Klebesadel 1974) data are extrapolated by the S -3/2 -law to flux levels 5 x 10 -8 erg cm -2 . Spherical halo, monoluminosity source distributions discussed by Jennings & White (1980) have failed to satisfy these data although they are consistent with triangulation results obtained by spacecraft networks on a few individual burst arrival directions (Hurley 1980). On the other hand, thick disc source models seem to satisfy the observed lg N -lg S distribution.

scholarly journals Magnetohydrodynamic simulations of gamma-ray burst jets: Beyond the progenitor star

New Astronomy ◽  
2010 ◽  
Vol 15 (8) ◽  
pp. 749-754 ◽  
Author(s):  
Alexander Tchekhovskoy ◽  
Ramesh Narayan ◽  
Jonathan C. McKinney
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Burst ◽  
Magnetohydrodynamic Simulations

scholarly journals Statistical Properties of Gamma-Ray Burst Host Galaxies

2012 ◽  
Vol 8 (S292) ◽  
pp. 190-190
Author(s):  
J. M. Chen ◽  
L. W. Jia ◽  
E. W. Liang
Keyword(s):  
Gamma Ray ◽  
Formation Rate ◽  
Neutral Hydrogen ◽  
Statistical Properties ◽  
Host Galaxy ◽  
Host Galaxies ◽  
Gamma Ray Burst ◽  
Star Forming ◽  
Hydrogen Column Density ◽  
Linear Fit

AbstractGRBs are the most luminous events in the Universe. They are detectable from local to high-z universe and may serve as probes for high-z galaxies (e.g., Savaglio et al. 2009; Kewley & Dopita 2002). We compile the observations for 61 GRB host galaxies from literature. Their redshifts range from 0.0085 to 6.295. We present the statistical properties of the GRB host galaxies, including the stellar mass (M*), star-forming rate (SFR), metallicity (Z), extinction (AV), and neutral hydrogen column density (NH). We explore possible correlations among the properties of gamma-ray burst host galaxies and their cosmic evolution with observations of 61 GRB host galaxies. Our results are shown in Figure 1. A clear Z-M* relation is found in our sample, which is Z ~ M0.4. The host galaxies of local GRBs with detection of accompanied supernovae also share the same relation with high-z GRB host galaxies. A trend that a more massive host galaxy tends to have a higher star-formation rate is found. The best linear fit gives a tentative relation, i.e, SFR ~ M0.75. No any correlation is found between AV and NH. A GRB host galaxy at a higher redshift also tends to have a higher SFR. Even in the same redshift, the SFR may vary over three orders of magnitude. The metallicity of the GRB host galaxies is statistically higher than that of the QSO DLAs. The full version of our results please refer to Chen et al. (2012).

Metallicity of Gamma-Ray Burst Progenitors: Connection between Star Formation and Gamma-Ray Burst Production

2010 ◽  
Author(s):  
Y. Niino ◽  
J.-H. Choi ◽  
M. A. R. Kobayashi ◽  
K. Nagamine ◽  
T. Totani ◽  
...  
Keyword(s):  
Star Formation ◽  
Gamma Ray ◽  
Gamma Ray Burst
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