Details

Autor(en) / Beteiligte

• Gorosabel, J.
• Castro-Tirado, A. J.
• Guziy, S.
• de Ugarte Postigo, A.
• Reverte, D.
• Antonelli, A.
• Covino, S.
• Malesani, D.
• Martín-Gordón, D.
• Melandri, A.
• Jelínek, M.
• Elias de la Rosa, N.
• Bogdanov, O.
• Castro Cerón, J. M.

Titel

The short-duration GRB 050724 host galaxy in the context of the long-duration GRB hosts

Ist Teil von

• Astronomy and astrophysics (Berlin), 2006-04, Vol.450 (1), p.87-92

Ort / Verlag

Les Ulis: EDP Sciences

Erscheinungsjahr

2006

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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 populations, 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 short GRB host galaxy metallicity enrichment is considered, the synthetic templates fit the observed SED satisfactorily. The internal host extinction is low ($A_{\rm v} \lesssim 0.4$ mag) so it cannot explain the faintness of the afterglow. This short GRB host galaxy is more massive (${\sim}5\times10^{10}\, M_{\odot}$) and luminous (${\sim}1.1~ L^{\star}$) than most of the long-duration GRB hosts. A statistical comparison based on the 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.