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Title:
ISM Studies of GRB 030329 with High-Resolution Spectroscopy
Authors:
Thöne, Christina C.; Greiner, Jochen; Savaglio, Sandra; Jehin, Emmanuël
Affiliation:
AA(Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany; Dark Cosmology Centre, Niels Bohr Institut, Juliane Maries Vej 30, 2100 København Ø, Denmark), AB(Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany), AC(Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany), AD(European Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago 19, Chile)
Publication:
The Astrophysical Journal, Volume 671, Issue 1, pp. 628-636. (ApJ Homepage)
Publication Date:
12/2007
Origin:
UCP
Astronomy Keywords:
Gamma Rays: Bursts, Galaxies: Quasars: Absorption Lines
DOI:
10.1086/522558
Bibliographic Code:
2007ApJ...671..628T

Abstract

We present early Very Large Telescope UV-Visual Echelle Spectrograph (VLT UVES) high-resolution spectra of the afterglow of GRB 030329 at redshift z=0.16867+/-0.00001. In contrast to other spectra from this burst, both emission and absorption lines were detected. None of them showed any temporal evolution. From the emission lines, we determine the properties of the host galaxy, which has a star formation rate (SFR) of 0.198 Msolar yr-1 and a low metallicity of 0.17 Zsolar. Given the low total stellar host mass logM*=7.75+/-0.15 Msolar and an absolute luminosity mB=-16.29, we derive specific SFRs (SSFR) of logSFR=-8.5 yr-1 and SFR = 15.1 Msolar yr-1 L-1*. This fits well into the picture of GRB hosts as being low-mass, low-metallicity, actively star-forming galaxies. The Mg II and Mg I absorption lines from the host show multiple narrow (Doppler width b=5-12 km s-1) components spanning a range of v~230 km s-1, mainly blueshifted compared to the redshift from the emission lines. These components are likely probing outflowing material of the host galaxy, which could arise from former galactic superwinds, driven by supernovae from star-forming regions. Similar features have been observed in QSO spectra. The outflowing material has high column densities of logNMgII=13.99+/-0.04 cm-2 and logNMgI=12.39+/-0.04 cm-2 and the nonvariability of the column densities implies a distance of at least 560 pc from the burst, further supporting an outflow scenario.

Based on ESO proposal 70.D-0087.

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