scholarly journals Nuclear composition of magnetized gamma-ray burst jets

2015 ◽  
Vol 67 (3) ◽  
pp. 49 ◽  
Author(s):  
Sanshiro Shibata ◽  
Nozomu Tominaga
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Burst ◽  
Nuclear Composition

Origin of Ultra-High Energy Cosmic Rays: Nuclear Composition of Gamma-ray Burst Jets

2011 ◽  
Author(s):  
Sanshiro Shibata ◽  
Nozomu Tominaga ◽  
Hiroyuki Sagawa ◽  
Yoshiya Kawasaki ◽  
Takashi Sako ◽  
...  
Keyword(s):  
Cosmic Rays ◽  
Gamma Ray ◽  
High Energy ◽  
Ultra High Energy ◽  
Gamma Ray Burst ◽  
High Energy Cosmic Rays ◽  
Nuclear Composition

scholarly journals Nuclear Composition of Gamma‐Ray Burst Fireballs

2003 ◽  
Vol 588 (2) ◽  
pp. 931-944 ◽  
Author(s):  
Andrei M. Beloborodov
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Burst ◽  
Nuclear Composition

scholarly journals Origin of Ultra-High Energy Cosmic Rays: Nuclear Composition of Gamma-Ray Burst Jets

2011 ◽  
Vol 7 (S279) ◽  
pp. 389-390
Author(s):  
Sanshiro Shibata ◽  
Nozomu Tominaga
Keyword(s):  
Cosmic Rays ◽  
Gamma Ray ◽  
High Energy ◽  
Ultra High Energy ◽  
Heavy Nuclei ◽  
Gamma Ray Burst ◽  
High Energy Cosmic Rays ◽  
Relativistic Jet ◽  
Launch Site ◽  
Nuclear Composition

AbstractUltra-high energy cosmic rays (UHECRs) are the most energetic particles flying from space and their source is not clarified yet. Recently, the Pierre Auger Observatory (PAO) suggests that UHECRs involve heavy nuclei. The PAO results require that a considerable fraction of metal nuclei must exist in the accelerating site, which can be realized only in the stellar interior. This puts strong constraints on the origin of UHECRs. In order to definitize the constraints from PAO results, we investigate the fraction of metal nuclei in a relativistic jet in gamma-ray burst associated with core-collapse supernova. If the jet is initially dominated by radiation field, quasi-statistical equilibrium (QSE) is established and heavy nuclei are dissociated to light particles such as 4He during the acceleration and expansion. On the other hand, if the jet is mainly accelerated by magnetic field heavy or intermediate mass nuclei can survive. The criterion to contain the metal nuclei is that the temperature at the launch site is below 4.5 × 109K. Therefore, if the composition of UHECRs is dominated by metal nuclei, a GRB with the magnetized jet is the most plausible candidate of the accelerating site.

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).

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