Are long gamma-ray bursts biased tracers of star formation? Clues from the host galaxies of the Swift/BAT6 complete sample of LGRBs - I. Stellar mass at z < 1

S. D. Vergani; R. Salvaterra; J. Japelj; E. Le Floc’h; P. D’Avanzo; A. Fernandez-Soto; T. Krühler; A. Melandri; S. Boissier; S. Covino; M. Puech; J. Greiner; L. K. Hunt; D. Perley; P. Petitjean; T. Vinci; F. Hammer; A. Levan; F. Mannucci; S. Campana; H. Flores; A. Gomboc; G. Tagliaferri

doi:10.1051/0004-6361/201425013

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Volume 581 (September 2015)

A&A, 581 (2015) A102

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Fig. 5

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Cumulative distribution of the stellar masses (including the old stellar population) of the LGRB hosts in our sample (dotted line: whole sample; solid line: with LogM_⋆> 8.4 M_⊙, to comply with the simulation limits) compared to what is obtained by LGRB host galaxy simulations. The observed distribution is explained by a metallicity cut favouring low metallicities (Z < 0.5 Z_⊙).

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