Reference : ISM Studies of GRB 030329 with High-Resolution Spectroscopy
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/107604
ISM Studies of GRB 030329 with High-Resolution Spectroscopy
English
Thöne, Christina C [Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany; Dark Cosmology Centre, Niels Bohr Institut, Juliane Maries Vej 30, 2100 København Ø, Denmark]
Greiner, Jochen [Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany]
Savaglio, Sandra [Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany]
Jehin, Emmanuel mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image]
1-Dec-2007
Astrophysical Journal
University of Chicago Press
671
628-636
Yes (verified by ORBi)
International
0004-637X
1538-4357
Chicago
IL
[en] Gamma Rays: Bursts ; Galaxies: Quasars: Absorption Lines
[en] 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 M[SUB]solar[/SUB] yr[SUP]-1[/SUP] and a low metallicity of 0.17 Z[SUB]solar[/SUB]. Given the low total stellar host mass logM[SUB]*[/SUB]=7.75+/-0.15 M[SUB]solar[/SUB] and an absolute luminosity m[SUB]B[/SUB]=-16.29, we derive specific SFRs (SSFR) of logSFR=-8.5 yr[SUP]-1[/SUP] and SFR = 15.1 M[SUB]solar[/SUB] yr[SUP]-1[/SUP] L[SUP]-1[/SUP][SUB]*[/SUB]. 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[SUP]-1[/SUP]) components spanning a range of v~230 km s[SUP]-1[/SUP], 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 logN[SUB]MgII[/SUB]=13.99+/-0.04 cm[SUP]-2[/SUP] and logN[SUB]MgI[/SUB]=12.39+/-0.04 cm[SUP]-2[/SUP] 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.
Researchers
http://hdl.handle.net/2268/107604
10.1086/522558
http://adsabs.harvard.edu/abs/2007ApJ...671..628T
http://de.arxiv.org/abs/astro-ph/0611772

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Restricted access
70894.web.pdfPublisher postprint373.62 kBRequest copy

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.