SIMBAD references

2013ApJ...764...75G - Astrophys. J., 764, 75 (2013/February-2)

On the correlation of low-energy spectral indices and redshifts of gamma-ray bursts.


Abstract (from CDS):

It was found by Amati et al. in 2002 that for a small sample of nine gamma-ray bursts (GRBs), more distant events appear to be systematically harder in the soft gamma-ray band. Here, we have collected a larger sample of 65 GRBs, whose time-integrated spectra are well established and can be well fitted with the so-called Band function. It is confirmed that a correlation between the redshifts (z) and the low-energy indices (α) of the Band function does exist, though it is a bit more scattered than the result of Amati et al. This correlation cannot be simply attributed to the effect of photon reddening. Furthermore, correlations between α and Epeak (the peak energy in the νFν spectrum in the rest frame), α and Eiso(the isotropic energy release), and α and Liso(the isotropic luminosity) are also found, which indicate that these parameters are somehow connected. The results may provide useful constraints on the physics of GRBs.

Abstract Copyright:

Journal keyword(s): gamma-ray burst: general - methods: statistical - X-rays: bursts

Simbad objects: 65

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