Are long gamma-ray bursts biased tracers of star formation? Clues from the host galaxies of the Swift/BAT6 complete sample of bright LGRBs: III. Stellar masses, star formation rates, and metallicities at z > 1
- Palmerio, J. T.
- Vergani, S. D.
- Salvaterra, R.
- Sanders, R. L.
- Japelj, J.
- Vidal-García, A.
- D’avanzo, P.
- Corre, D.
- Perley, D. A.
- Shapley, A. E.
- Boissier, S.
- Greiner, J.
- Le Floc’h, E.
- Wiseman, P.
DOIAbstract
International audienceAims. Long gamma-ray bursts (LGRB) have been proposed as promising tracers of star formation owing to their association with the core-collapse of massive stars. Nonetheless, previous studies we carried out at z 3, once the bulk of the star forming galaxy population are characterised by metallicities below this limit. The role played by metallicity can be explained by the conditions necessary for the progenitor star to produce an LGRB. The moderately high metallicity threshold found is in agreement with the conditions necessary to rapidly produce a fast-rotating Wolf-Rayet stars in close binary systems, and could be accommodated by single star models under chemically homogeneous mixing with very rapid rotation and wea...
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