Salvaterra 2008 长暴光度函数和z>6的诞生率

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Title:		The Luminosity Function of Long Gamma-Ray Bursts and their rate at z>6
Authors:		Salvaterra, R.; Campana, S.; Chincarini, G.; Choudhury, T. R.; Covino, S.; Ferrara, A.; Gallerani, S.; Guidorzi, C.; Tagliaferri, G.
Publication:		eprint arXiv:0808.0591
Publication Date:		08/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		5 pages, 5 figures, Conference Proceeding for IAU Symposium 255: Low-Metallicity Star Formaion: From the First Stars to Dwarf Galaxies
Bibliographic Code:		2008arXiv0808.0591S

Abstract

We compute the luminosity function (LF) and the formation rate of long gamma ray bursts (GRBs) in three different scenarios: i) GRBs follow the cosmic star formation and their LF is constant in time; ii) GRBs follow the cosmic star formation but the LF varies with redshift; iii) GRBs form preferentially in low-metallicity environments. We then test model predictions against the Swift 3-year data, showing that scenario i) is robustly ruled out. Moreover, we show that the number of bright GRBs detected by Swift suggests that GRBs should have experienced some sort of luminosity evolution with redshift, being more luminous in the past. Finally we propose to use the observations of the afterglow spectrum of GRBs at z>5.5 to constrain the reionization history and we applied our method to the case of GRB 050904.

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