The redshift dependence of long gamma-ray burst intrinsic properties
Abstract
We performed a statistical analysis of the intrinsic properties and their redshift dependence of long gamma-ray bursts (GRBs) mainly detected by Swift satellite. The intrinsic quantities are the ( z- and K-corrected) rest-frame duration, T 90,rest, the rest-frame peak energy, E p,rest, the isotropic equivalent energy, E iso, and the peak isotropic luminosity, L iso, of the prompt emission. We find that the distributions of T 90,rest, E p,rest, E iso and L iso all span a wide range and their central values are T 90,rest∼10 s, E p,rest∼500 keV, E iso∼1053 erg and L iso∼3×1052 erg/s. We also show that E p,rest and L iso are independent with T 90,rest, but E iso is correlated with T 90,rest. Moreover, we find the observed peak energy is independent with redshift, but the intrinsic peak energy, the isotropic energy and the peak luminosity all show some dependence on redshift, where the truncation effect is taken into account.
- Publication:
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Astrophysics and Space Science
- Pub Date:
- April 2014
- DOI:
- 10.1007/s10509-014-1780-7
- Bibcode:
- 2014Ap&SS.350..691Z
- Keywords:
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- Gamma rays: general;
- Methods: data analysis;
- Methods: statistical