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18 April 2024

» arxiv » astro-ph/0507488

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The GRB 030329 host: a blue low metallicity subluminous galaxy with intense star formation
J. Gorosabel ; D. Pérez-Ramírez ; J. Sollerman ; A. de Ugarte Postigo ; J.P.U. Fynbo ; A.J. Castro-Tirado ; P. Jakobsson ; L. Christensen ; J. Hjorth ; G. Jóhannesson ; S. Guziy ; J.M. Castro Cerón ; G. Bjornsson ; V.V. Sokolov ; T.A. Fatkhullin ; K. Nilsson ;
Date:	20 Jul 2005
Subject:	astro-ph
Abstract:	We present broad band photometry and spectroscopic observations of the host galaxy of GRB 030329. Analysis of the spectral emission lines shows that the host is likely a low metallicity galaxy (Z~0.004). The spectral energy distribution (SED) constructed with the photometric points has been fitted using synthetic and observational templates. The best SED fit is obtained with a starburst template with an age of ~150 Myr and an extinction Av~0.6. We find that the GRB 030329 host galaxy is a subluminous galaxy (L~0.016 L) with a stellar mass of >~10^8 Mo. Three independent diagnostics, based on the restframe UV continuum, the [OII], and the Balmer emission lines, provide a consistent unextincted star formation rate of ~0.6 Mo yr^-1, implying a high unextincted specific star formation rate (~34 Mo yr^-1 (L/L)^-1). We estimate that the unextincted specific star formation rate of the GRB 030329 host is higher than ~93.5% of the galaxies at a similar redshift.
Source:	arXiv, astro-ph/0507488
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