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X-shooter slit observations of GRB hostgalaxies

Published online by Cambridge University Press:  22 July 2013

S.D. Vergani
S.D. Vergani*
Affiliation:
INAF, Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate, Italy GEPI, Observatoire de Paris, CNRS, Univ. Paris Diderot, 5 place Jules Janssen, 92195 Meudon, France
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Abstract

The Italian-French X-shooter GRB host program started at the end of 2009 and allowed usto collect the spectra of about 30 host galaxies in the 300–2400 nm range from a redshiftof about z = 0.1 to z = 2.7. We are using these spectra to retrieve information on thehost metallicities, star formation rates and extinctions. An accurate slit positioningallowed us to discover in some cases close-by galaxies at the same redshift than the GRBhost. Thanks to the comparison of the afterglow and host spectra, it is possible to assessfor possible interactions of these systems. We also looked for the counterparts of theforeground absorbers present in the afterglow spectra, but we obtained very fewidentifications.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 61: Gamma-ray Bursts: 15 Years of GRB Afterglows – Progenitors, Environments and Host Galaxies from the Nearby to the Early Universe , 2013 , pp. 407 - 411
Copyright
© EAS, EDP Sciences 2013

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