Spectro-photometric study of the GRB 030329 host galaxy

/ Authors

J. Gorosabel, D. Pérez-Ramírez, J. Sollerman, A. U. Postigo, J. Fynbo, A. Castro-Tirado, P. Jakobsson, L. Christensen, J. Hjorth, G. Jóhannesson

and 6 more authors

S. Guziy, J. M. C. Cer'on, G. Bjornsson, V. Sokolov, T. Fatkhullin, K. Nilsson

/ Abstract

In this study optical/near-infrared(NIR) broad band photometry and optical spectroscopic observations of the GRB 030329 host galaxy are presented. The Spectral Energy Distribution (SED) of the host is consistent with a starburst galaxy template with a dominant stellar population age of ~150 Myr and an extinction Av ~0.6. Analysis of the spectral emission lines shows that the host is likely a low metallicity galaxy. Two independent diagnostics, based on the restframe UV continuum and the [OII] line flux, provide a consistent unextincted star formation rate of SFR ~0.6 Mo yr^-1. The low absolute magnitude of the host (M_B ~ -16.5) implies a high specific star formation rate value, SSFR = ~34 Mo yr^-1 (L/L*)^-1.

Journal: arXiv: Astrophysics

DOI: 10.1393/ncc/i2005-10126-1