The Luminosity Function of Long Gamma-Ray Bursts and their rate at z>6

Details The Luminosity Function of Long Gamma-Ray Bursts and their rate at z>6 The Luminosity Function of Long Gamma-Ray Bursts and their rate at z>6

2008-08-05

arxiv.org/abs/0808.0591v1

Astronomy and Astrophysics

Astrophysics

5 pages, 5 figures, Conference Proceeding for IAU Symposium 255: Low-Metallicity Star Formaion: From the First Stars to Dwarf

Scientific paper

10.1017/S1743921308024848

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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