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The short-duration GRB 050724 host galaxy in the context of the long-duration GRB hosts | | J. Gorosabel
; A.J. Castro-Tirado
; S. Guziy
; A. de Ugarte Postigo
; D. Reverte Payá
; A. Antonelli
; S. Covino
; D. Malesani
; D. Martín-Gordón
; A. Melandri
; M. Jelínek
; O. Bogdanov
; J.M. Castro Cerón
; | | Date: |
5 Oct 2005 | | Subject: | astro-ph | | Abstract: | We report optical and near-infrared broad band observations of the short-duration GRB 050724 host galaxy, used to construct its spectral energy distribution (SED). Unlike the hosts of long-duration gamma-ray bursts (GRBs), which show younger stellar population, the SED of the GRB 050724 host galaxy is optimally fitted with a synthetic elliptical galaxy template based on an evolved stellar population (age ~2.6 Gyr). The SED of the host is difficult to reproduce with non-evolving metallicity templates. In contrast, if the host galaxy metallicity enrichment is considered, the synthetic templates fit satisfactorily the observed SED. The internal host extinction is low (Av ~< 0.4 mag) so it cannot explain the faintness of the afterglow. The host galaxy is more massive (5x10^10 Msun) and luminous (~1.1 L*) than most of the long-duration GRB hosts. A statistical comparison based on ages of short- and long-duration GRB host galaxies strongly suggests that short-duration GRB hosts contain, on average, older progenitors. These findings support a different origin for short- and long-duration GRBs. | | Source: | arXiv, astro-ph/0510141 | | Services: | Forum | Review | PDF | Favorites | |
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