Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-05-29
Astrophys.J. 616 (2004) 331-338
Astronomy and Astrophysics
Astrophysics
25 pages, 3 figures, accepted for publication in ApJ
Scientific paper
10.1086/424913
We consider all bursts with known redshift and $\nu F_\nu$ peak energy, $E^{obs}_{peak}$. For a good fraction of them an estimate of the jet opening angle is available from the achromatic break of their afterglow light curve. This allows the derivation of the collimation--corrected energy of the bursts, $E_\gamma$. The distribution of the values of $E_\gamma$ is more spread with respect to previous findings, covering about two orders of magnitude. We find a surprisingly tight correlation between $E_\gamma$ and the source frame $E_{peak}$: $E^{obs}_{peak}(1+z) \propto E_\gamma^{0.7}$. This correlation can shed light on the still uncertain radiation processes for the prompt GRB emission. More importantly, if the small scatter of this newly found correlation will be confirmed by forthcoming data, it will be possible to use it for cosmological purposes.
Ghirlanda Giancarlo
Ghisellini Gabriele
Lazzati Davide
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