دورية
The short-duration GRB 050724 host galaxy in the context of the long-duration GRB hosts
| العنوان: | The short-duration GRB 050724 host galaxy in the context of the long-duration GRB hosts |
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| المؤلفون: | 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., 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. |
| المصدر: | Astronomy and Astrophysics; April 2006, Vol. 450 Issue: 1 p87-92, 6p |
| مستخلص: | 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. |
| قاعدة البيانات: | Supplemental Index |
| تدمد: | 00046361 14320746 |
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| DOI: | 10.1051/0004-6361:20054373 |