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

Free access article

Issue		A&A Volume 444, Number 3, December IV 2005


Page(s)		711 - 721
Section		Extragalactic astronomy
DOI		http://dx.doi.org/10.1051/0004-6361:20052768

A&A 444, 711-721 (2005)
DOI: 10.1051/0004-6361:20052768

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

J. Gorosabel¹, D. Pérez-Ramírez², J. Sollerman³, A. de Ugarte Postigo¹, J. P. U. Fynbo⁴, A. J. Castro-Tirado¹, P. Jakobsson^{4, 5}, L. Christensen⁶, J. Hjorth⁴, G. Jóhannesson⁵, S. Guziy¹, J. M. Castro Cerón⁴, G. Björnsson⁵, V. V. Sokolov⁷, T. A. Fatkhullin⁷ and K. Nilsson^{4, 8}

¹ Instituto de Astrofísica de Andalucía (IAA-CSIC), PO Box 03004, 18080 Granada, Spain
    e-mail: [jgu;ajct;deugarte;gss]@iaa.es
² Universidad de Jaén, Departamento de Física (EPS), Virgen de la Cabeza 2, Jaén 23071, Spain
    e-mail: dperez@ujaen.es
³ Stockholm Observatory, Department of Astronomy, AlbaNova, 106 91 Stockholm, Sweden
    e-mail: jesper@astro.su.se
⁴ Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark
    e-mail: [jfynbo;pallja;jens;kim]@astro.ku.dk; josemari@alumni.nd.edu
⁵ Science Institute, University of Iceland, Dunhaga 3, 107 Reykjavík, Iceland
    e-mail: [gudlaugu;gulli]@raunvis.hi.is
⁶ Astrophysikalisches Institut, 14482 Potsdam, Germany
    e-mail: lchristensen@aip.de
⁷ Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhnij Arkhyz, 357 147 Karachai-Cherkessia, Rusia
    e-mail: [sokolov;timur]@sao.ru
⁸ European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching bei Munchen, Germany

(Received 25 January 2005 / Accepted 20 July 2005)

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 ( $Z\sim0.004$ ). 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 $A_{\rm v} \sim 0.6$ . We find that the GRB 030329 host galaxy is a subluminous galaxy ( $L \sim 0.016~ L^{\star}$ ) with a stellar mass of $\gtrsim$ $10^{8}~ M_{\odot}$ . Three independent diagnostics, based on the restframe UV continuum, the [ $\ion{O}{ii}$ ], and the Balmer emission lines, provide a consistent unextinguished star formation rate of $\sim$ $0.6~ M_{\odot}$ yr^-1, implying a high unextinguished specific star formation rate (~ $34 ~M_{\odot}$ yr $^{-1} (L/L^{\star})^{-1}$ ). 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.

Key words: gamma rays: bursts -- Galaxy: fundamental parameters -- techniques: photometric -- techniques: spectroscopic

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