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Are LGRBs biased tracers of star formation? Clues from the host galaxies of the Swift/BAT6 complete sample of LGRBs

Published online by Cambridge University Press:  27 October 2016

Susanna D. Vergani  and
collaborators
Susanna D. Vergani
Affiliation:
GEPI, Observatoire de Paris, PSL Research University, CNRS, Univ Paris Diderot, Sorbonne Paris Cité, Place Jules Janssen, 92195 Meudon, France email: [email protected] INAF, Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate, Italy
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Abstract

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Long gamma-ray bursts (LGRBs) are associated to the deaths of massive stars and could thus be used as a potentially powerful tool to trace cosmic star formation. However the conditions needed to produce a LGRBs may introduce a bias in the LGRB rate versus star formation rate (SFR) relation (called LGRB efficiency hereafter).

We have undertaken a study of the properties of the host galaxies of the BAT6 complete sample of LGRB to improve our knowledge on the LGRB efficiency, its redshift evolution, and the factor affecting it. This is the base to properly use LGRBs as SFR tracers.

We show that at z < 1 LGRBs are not direct SFR tracers because they tend to avoid high-metallicity galaxies. The use of the BAT6 complete sample keeps this result from being affected by possible biases that could have influenced past results based on incomplete samples. The preference for low (but not extremely low) metallicities can be a consequence of the particular conditions needed for the progenitor star to produce a GRB.

Keywords

gamma rays: burstsgalaxies: fundamental parameters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29B: Astronomy in Focus , August 2015 , pp. 249 - 250
Copyright
Copyright © International Astronomical Union 2016 

References

Salvaterra, R., Campana, S., & Vergani, S. D., et al. 2012, ApJ, 749, 68 Google Scholar
Vergani, S. D., Salvaterra, R., & Japelj, J., et al. 2015, A&A, 581, 102 Google Scholar