GRB Formation Rates inferred from the Spectral Peak Energy - Luminosity Relation

2003/09/08 by D. Yonetoku, T. Murakami, T. Nakamura +3 · 2 citations
Physics and Astronomy · #astro-ph

paper · pdf · doi:10.1086/421285

published as Astrophys.J.609:935,2004 · 13 pages, 4 figures, Submitted to ApJL

arxiv created 2003/09/08 · arxiv updated 2011/08/11

Abstract

We investigate the GRB formation rate based on the relation between the spectral peak energy (E_p) and the isotropic luminosity. The E_p--luminosity relation covers the energy range of 50 -- 2000 keV and the luminosity range of 10⁵⁰--10⁵⁴ erg/s, respectively. We find that the relation is considerably tighter than similar relations suggested previously. Using E_p--luminosity relation, we estimate the luminosity and the redshift of 684 GRBs with the unknown distances and derive the GRB formation rate as a function of the redshift. For 0 ≤ z ≤ 2, the GRB formation rate is well correlated with the star formation rate while it increases monotonously from z∼ 2 out to z ∼ 12. This behavior is consistent with the results of previous works using the lag--luminosity relation or the variability--luminosity relation.

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