Spectro-photometric study of the GRB 030329 host galaxy
J. Gorosabel, D. Perez-Ramirez, J. Sollerman, A. de Ugarte Postigo, J. P. U. Fynbo, A. J. Castro-Tirado, P. Jakobsson, L. Christensen, J. Hjorth, G. Johannesson, S. Guziy, J. M. Castro Cerón, G. Bjornsson, V. V. Sokolov, T. A. 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 (MB ~ -16.5) implies a high specific star formation rate value, SSFR = ~34 Mo yr-1 (L/L*)-1.
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