The host galaxy of GRB 031203: A new spectroscopic study

R. Margutti*, G. Chincarini, S. Covino, G. Tagliaferri, S. Campana, M. Della Valle, A. V. Filippenko, F. Fiore, R. Foley, D. Fugazza, P. Giommi, D. Malesani, A. Moretti, L. Stella

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Aims. The host galaxy of the long-duration gamma-ray burst (GRB) 031203 (HG031203) offers a precious opportunity to study in detail the environment of a nearby GRB. The aim is to better characterize this galaxy and analyse the possible evolution with time of the spectroscopic quantities we derive. Methods. We analyse HG 031203 using a set of optical spectra acquired with the ESO-VLT and Keck telescope. We compare the metallicity, luminosity and star formation properties of this galaxy and of the other supernova-long gamma-ray burst hosts in the local universe (z < 0.2) against the KPNO International Spectroscopic Survey. Results. HG 031203 is a metal poor, actively star forming galaxy (star formation rate of 12.9 ± 2.2M yr-1) at z = 0.1054. From the emission-line analysis we derive an intrinsic reddening E HG(B - V) ≈ 0.4. This parameter doesn't show a compelling evidence of evolution at a month time-scale. We find an interstellar medium temperature of ≈12 500 K and an electronic density of Ne = 160 cm -3. After investigating for possible Wolf-Rayet emission features in our spectra, we consider dubious the classification of HG 031203 as a Wolf-Rayet galaxy. Long gamma-ray burst (LGRB) and supernova hosts in the local universe (z < 0.2) show, on average, specific star formation rates higher than ordinary star forming galaxy at the same redshift. On the other hand, we find that half of the hosts follows the metallicity-luminosity relation found for star-burst galaxies; HG031203 is a clear outlier, with its really low metallicity (12 + log(0/H) = 8.12 ± 0.04).

Original languageEnglish (US)
Pages (from-to)815-826
Number of pages12
JournalAstronomy and Astrophysics
Volume474
Issue number3
DOIs
StatePublished - Nov 2007

Keywords

  • Galaxies: individual: GRB 031203
  • Gamma rays: bursts
  • ISM: abundances
  • Stars: Wolf-Rayet

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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