TY - JOUR
T1 - The GRB 030329 host
T2 - A blue low metallicity subluminous galaxy with intense star formation
AU - Gorosabel, J.
AU - Pérez-Ramírez, D.
AU - Sollerman, J.
AU - De Ugarte Postigo, A.
AU - Fynbo, J. P.U.
AU - Castro-Tirado, A. J.
AU - Jakobsson, P.
AU - Christensen, L.
AU - Hjorth, J.
AU - Jóhannesson, G.
AU - Guziy, S.
AU - Castro Cerón, J. M.
AU - Björnsson, G.
AU - Sokolov, V. V.
AU - Fatkhullin, T. A.
AU - Nilsson, K.
PY - 2005/12
Y1 - 2005/12
N2 - 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 ≳ 108 M⊙. Three independent diagnostics, based on the restframe UV continuum, the [O Π], and the Balmer emission lines, provide a consistent unextinguished star formation rate of ∼0.6 M⊙ yr-1, implying a high unextinguished specific star formation rate (∼34 M⊙ yr -1(L/L*)-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.
AB - 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 ≳ 108 M⊙. Three independent diagnostics, based on the restframe UV continuum, the [O Π], and the Balmer emission lines, provide a consistent unextinguished star formation rate of ∼0.6 M⊙ yr-1, implying a high unextinguished specific star formation rate (∼34 M⊙ yr -1(L/L*)-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.
KW - Galaxy: fundamental parameters
KW - Gamma rays: bursts
KW - Techniques: photometric
KW - Techniques: spectroscopic
UR - https://www.scopus.com/pages/publications/29444438028
U2 - 10.1051/0004-6361:20052768
DO - 10.1051/0004-6361:20052768
M3 - Article
SN - 0004-6361
VL - 444
SP - 711
EP - 721
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
IS - 3
ER -