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. (\cite{Piro02}) based on a single emission line. Furthermore, we have determined the photometric redshift of all the galaxies in an area of 6' × 6' 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 Msun yr-1 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. Based on observations collected at the European Southern Observatory, in La Silla and Paranal (Chile), ESO Large Programmes 165.H-0464(E), 165.H-0464(I) and 265.D-5742(C), granted to the GRACE Team. Based on observations made with the Danish 1.54-m telescope, in La Silla (Chile).

A multi-colour study of the dark GRB 000210 host galaxy and its environment

FRONTERA, Filippo;
2003

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. (\cite{Piro02}) based on a single emission line. Furthermore, we have determined the photometric redshift of all the galaxies in an area of 6' × 6' 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 Msun yr-1 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. Based on observations collected at the European Southern Observatory, in La Silla and Paranal (Chile), ESO Large Programmes 165.H-0464(E), 165.H-0464(I) and 265.D-5742(C), granted to the GRACE Team. Based on observations made with the Danish 1.54-m telescope, in La Silla (Chile).
Gorosabel, J.; Christensen, L.; Hjorth, J.; Fynbo, J. U.; Pedersen, H.; Jensen, B. L.; Andersen, M. I.; Lund, N.; Jaunsen, A. O.; Castro, Cern; J., M.; Frontera, Filippo; And, Coauthors
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1202259
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 53
  • ???jsp.display-item.citation.isi??? 57
social impact