A multi-colour study of the dark GRB 000210 host galaxy and its environment
Abstract
We present UBVRIZJsHKs broad band photometry of the host galaxy of the dark gamma-ray burst (GRB) of February 10, 2000. These observations represent the most exhaustive photometry given to date of any GRB host galaxy. A grid of spectral templates have been fitted to the Spectral Energy Distribution (SED) of the host. The derived photometric redshift is z=0.842^+0.054_-0.042, which is in excellent agreement with the spectroscopic redshift (z=0.8463+/-0.0002) proposed by Piro et al. (2002) based on a single emission line. Furthermore, we have determined the photometric redshift of all the galaxies in an area of 6'x6' around the host galaxy, in order to check for their overdensity in the environment of the host. We find that the GRB 000210 host galaxy is a subluminous galaxy (L ~ 0.5+/-0.2 L*), with no companions above our detection threshold of 0.18+/-0.06 L*. Based on the restframe ultraviolet flux a star formation rate of 2.1+/-0.2 Solar Masses per year is estimated. The best fit to the SED is obtained for a starburst template with an age of 0.181^+0.037_-0.026 Gyr and a very low extinction (Av~0). We discuss the implications of the inferred low value of Av and the age of the dominant stellar population for the non detection of the GRB 000210 optical afterglow.
Keywords
Cite
@article{arxiv.astro-ph/0212334,
title = {A multi-colour study of the dark GRB 000210 host galaxy and its environment},
author = {J. Gorosabel and L. Christensen and J. Hjorth and J. U. Fynbo and H. Pedersen and B. L. Jensen and M. I. Andersen and N. Lund and A. O. Jaunsen and J. M. Castro Cerón and A. J. Castro-Tirado and A. S. Fruchter and J. Greiner and E. Pian and P. M. Vreeswijk and I. Burud and F. Frontera and L. Kaper and S. Klose and C. Kouveliotou and N. Masetti and E. Palazzi and J. Rhoads and E. Rol and I. Salamanca and N. Tanvir and R. A. M. J. Wijers and E. P. J. van den Heuvel},
journal= {arXiv preprint arXiv:astro-ph/0212334},
year = {2009}
}
Comments
10 pages with 4 encapsulated PostScript figures included. Accepted for publication in Astronomy & Astrophysics