The GRB 030329 host: a blue low metallicity subluminous galaxy with intense star formation

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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 (). 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 . We find that the GRB 030329 host galaxy is a subluminous galaxy () with a stellar mass of ≳. Three independent diagnostics, based on the restframe UV continuum, the [], and the Balmer emission lines, provide a consistent unextinguished star formation rate of yr-1, implying a high unextinguished specific star formation rate (~ yr). We estimate that the unextinguished specific star formation rate of the GRB 030329 host is higher than ~93.5% of the galaxies at a similar redshift.
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