TOUGH: Observational aspects of gamma-ray burst host galaxies
Jens Hjorth, Daniele Malesani, Andreas O. Jaunsen, Andrew J. Levan, Bo, Milvang-Jensen, Darach Watson, Javier Gorosabel, Johan P. U. Fynbo, Micha{\l}, J. Micha{\l}owski, Nial R. Tanvir, P\'all Jakobsson, Palle M{\o}ller, Steve, Schulze, Thomas Kr\"uhler
TL;DR
This paper introduces the TOUGH sample, a complete set of 69 X-ray selected GRB host galaxies spanning a wide redshift range, to study their statistical properties and observational characteristics.
Contribution
The paper presents the first comprehensive observational survey of a complete, optically unbiased sample of GRB host galaxies across a broad redshift range.
Findings
GRB host galaxies are generally faint, blue, young, star-forming dwarf galaxies.
The TOUGH sample provides a statistically complete basis for future studies.
Initial results highlight the diversity and properties of GRB host galaxies.
Abstract
GRB-selected galaxies are broadly known to be faint, blue, young, star-forming dwarf galaxies. This insight, however, is based in part on heterogeneous samples of optically selected, lower-redshift galaxies. To study the statistical properties of GRB-selected galaxies we here introduce The Optically Unbiased GRB Host (TOUGH) complete sample of 69 X-ray selected Swift GRB host galaxies spanning the redshift range 0.03-6.30 and summarise the first results of a large observational survey of these galaxies.
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