The collimation--corrected GRB energies correlate with the peak energy of their νF_ν spectrum

2004/05/31 by G. Ghirlanda, G. Ghisellini, D. Lazzati · 1 citation
Physics and Astronomy · #astro-ph

paper · pdf · doi:10.1086/424913

published as Astrophys.J. 616 (2004) 331-338 · 25 pages, 3 figures, accepted for publication in ApJ

arxiv created 2004/08/17 · arxiv updated 2009/12/01

Abstract

We consider all bursts with known redshift and νF_ν 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_γ. The distribution of the values of E_γ is more spread with respect to previous findings, covering about two orders of magnitude. We find a surprisingly tight correlation between E_γ and the source frame E_peak: E^obs_peak(1+z) ∝ E_γ^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.

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