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Gamma-Ray Bursts and the Early Star-Formation History

Chary, R. and Petitjean, P. and Robertson, B. and Trenti, M. and Vangioni, E. (2016) Gamma-Ray Bursts and the Early Star-Formation History. Space Science Reviews, 202 (1). pp. 181-194. ISSN 0038-6308.

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We review the uncertainties in high-z star-formation rate (SFR) measures and the constraints that one obtains from high-z gamma-ray burst (GRB) rates on them. We show that at the present time, the GRB rates per unit star-formation at z>3 are higher than at lower redshift. There could be a multitude of reasons for this: a stellar metallicity bias for GRB production, a top-heavy initial mass function (IMF) and/or missing a significant fraction of star-formation in field galaxy surveys due to incompleteness, surface brightness limitations and cosmic variance. We also compare metallicity predictions made using a hierarchical model of cosmic chemical evolution based on two recently proposed SFRs, one based on the observed galaxy luminosity function at high redshift and one based on the GRB rate and find that within the considerable scatter in metal abundance measures, they both are consistent with the data. Analyzing the ensemble of different measurements together, we conclude that despite metallicity biases, GRBs may be a less biased probe of star-formation at z>3 than at z<2. There is likely to be a common origin to the high GRB rate per unit star-formation and the high observed Lyman-continuum production rate in high redshift galaxies and that this may be due to a relative overabundance of stars with mass >25 M⊙ which are likely GRB progenitors. We also find that to reconcile these measurements with the Thomson scattering cross section of cosmic microwave background (CMB) photons measured by Planck, the escape fraction of Lyman-continuum photons from galaxies must be low, about ∼15 % or less and that the clumping factor of the IGM is likely to be small, ∼3. Finally, we demonstrate that GRBs are unique probes of metallicity evolution in low-mass galaxy samples and that GRB hosts likely lost a significant fraction of metals to the intergalactic medium (IGM) due to feedback processes such as stellar winds and supernovae.

Item Type:Article
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Chary, R.0000-0001-7583-0621
Additional Information:© 2016 Springer Science+Business Media Dordrecht. Received: 16 January 2016; Accepted: 2 September 2016. First Online: 19 October 2016. The work of EV and PPJ has been carried out at the ILP LABEX (under reference ANR-10-LABX-63) supported by French state funds managed by the ANR within the Investissements d’Avenir programme under reference ANR-11-IDEX-0004-02. It was also sponsored by the French Agence Nationale pour la Recherche (A.N.R.) via the grant VACOUL (ANR-2010-Blan-0510-01). We thank the referees for their feedback and clarifying remarks.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Agence Nationale pour la Recherche (ANR)ANR-10-LABX-63
Agence Nationale pour la Recherche (ANR)ANR-11-IDEX-0004-02
Agence Nationale pour la Recherche (ANR)ANR-2010-Blan-0510-01
Subject Keywords:Gamma ray bursts; Star formation history; Reionization; Chemical abundances
Issue or Number:1
Record Number:CaltechAUTHORS:20161026-150903134
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Official Citation:Chary, R., Petitjean, P., Robertson, B. et al. Space Sci Rev (2016). doi:10.1007/s11214-016-0288-6
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71513
Deposited By: Tony Diaz
Deposited On:27 Oct 2016 16:14
Last Modified:03 Oct 2019 16:08

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