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|Title:||GRB host galaxies with VLT/X-Shooter: properties at 0.8 < z < 1.3||Authors:||PIRANOMONTE, Silvia
Vergani, S. D.
RANDICH, Maria Sofia
|Issue Date:||2015||Journal:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY||Number:||452||Issue:||4||First Page:||3293||Abstract:||Long gamma-ray bursts (LGRBs) are associated with the death of massive stars. Their host galaxies therefore represent a unique class of objects tracing star formation across the observable Universe. Indeed, recently accumulated evidence shows that GRB hosts do not differ substantially from general population of galaxies at high (z > 2) redshifts. However, it has been long recognized that the properties of z < 1.5 hosts, compared to general star-forming population, are unusual. To better understand the reasons for the supposed difference in LGRB hosts properties at z < 1.5, we obtained Very Large Telescope (VLT)/X-Shooter spectra of six hosts lying in the redshift range of 0.8 < z < 1.3. Some of these hosts have been observed before, yet we still lack well-constrained information on their characteristics such as metallicity, dust extinction and star formation rate (SFR). We search for emission lines in the VLT/X-Shooter spectra of the hosts and measure their fluxes. We perform a detailed analysis, estimating host average extinction, SFRs, metallicities and electron densities where possible. Measured quantities of our hosts are compared to a larger sample of previously observed GRB hosts at z < 2. SFRs and metallicities are measured for all the hosts analysed in this paper and metallicities are well determined for four hosts. The mass-metallicity relation, the fundamental metallicity relation and SFRs derived from our hosts occupy similar parameter space as other host galaxies investigated so far at the same redshift. We therefore conclude that GRB hosts in our sample support the found discrepancy between the properties of low-redshift GRB hosts and the general population of star-forming galaxies.||Acknowledgments:||This work is based on VLT/X-Shooter spectroscopy observations performed at the European Southern Observatory, Paranal, Chile. We acknowledge ESO personnel for their assistance during the observing runs and Roberto Pallavicini, the Italian P.I. of X-Shooter, who was one of the most active promoters of this wonderful instrument. We thank Tommaso Vinci with his software Identifica. SP acknowledges partial support from PRIN MIUR 2009 and from ASI INAF I/004/11/1. E. Pian acknowledges financial support from MIUR and Scuola Normale Superiore, and from grants ASI INAF I/088/06/0 and INAF PRIN 2011. This research has made use of the GHostS data base ( www.grbhosts.org ), which is partly funded by Spitzer /NASA grant RSA Agreement No. 1287913. This paper is based on observations collected at the European Southern Observatory Very Large Telescope, Cerro Paranal, Chile (programmes 084.A-0631(A), 085A-0795(A) and 0.87A-0451(A)).||URI:||http://hdl.handle.net/20.500.12386/23453||URL:||https://academic.oup.com/mnras/article/452/4/3293/1063092||ISSN:||0035-8711||DOI:||10.1093/mnras/stv1569||Bibcode ADS:||2015MNRAS.452.3293P||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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