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The Luminosity Function of Long Gamma-Ray Burst and their rate at z ≥ 6

Published online by Cambridge University Press:  01 June 2008

R. Salvaterra ,
S. Campana ,
G. Chincarini ,
T. R. Choudhury ,
S. Covino ,
A. Ferrara ,
S. Gallerani ,
C. Guidorzi  and
G. Tagliaferri
R. Salvaterra
Affiliation:
INAF, Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (LC), Italy
S. Campana
Affiliation:
INAF, Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (LC), Italy
G. Chincarini
Affiliation:
INAF, Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (LC), Italy Università degli Studi di Milano Bicocca, Piazza della Scienza 3, I-20126 Milano, Italy
T. R. Choudhury
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
S. Covino
Affiliation:
INAF, Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (LC), Italy
A. Ferrara
Affiliation:
SISSA/International School for Advanced Studies, Via Beirut 4, I-34100 Trieste, Italy
S. Gallerani
Affiliation:
Institute of Physics, Eötvös University, Pázmány P. s. 1/A, 1117 Budapest, Hungary
C. Guidorzi
Affiliation:
INAF, Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (LC), Italy
G. Tagliaferri
Affiliation:
INAF, Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (LC), Italy
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Abstract

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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 then applied our method to the case of GRB 050904.

Keywords

gamma rays: burstsstars: formationcosmology: observations(galaxies:) intergalactic medium
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Issue S255: Low-Metallicity Star Formation: From the First Stars to Dwarf Galaxies , June 2008 , pp. 212 - 216
Copyright
Copyright © International Astronomical Union 2008

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