The Host Galaxy of GRB 990712

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dc.creatorChristensen, Lise
dc.creatorHjorth, Jens
dc.creatorGorosabel, Javier
dc.creatorVreeswijk, Paul
dc.creatorFruchter, Andrew
dc.creatorSahu, Kailash
dc.creatorPetro, Larry
dc.date2003-09-28
dc.date.accessioned2026-07-07T02:09:48Z
dc.date.available2026-07-07T02:09:48Z
dc.descriptionWe present a comprehensive study of the z=0.43 host galaxy of GRB 990712, involving ground-based photometry, spectroscopy, and HST imaging. The broad-band UBVRIJHKs photometry is used to determine the global spectral energy distribution (SED) of the host galaxy. Comparison with that of known galaxy types shows that the host is similar to a moderately reddened starburst galaxy with a young stellar population. The estimated internal extinction in the host is Av=0.15+/-0.1 and the star-formation rate (SFR) from the UV continuum is 1.3+/-0.3 M_sun/yr, (not corrected for the effects of extinction). Other galaxy template spectra than starbursts failed to reproduce the observed SED. We also present VLT spectra leading to the detection of Halpha from the GRB host galaxy. A SFR of 2.8+/-0.7 M_sun/yr, is inferred from the Halpha line flux, and the presence of a young stellar population is supported by a large equivalent width. Images from HST/STIS show that the host has two separate knots, which could be two distinct star-forming regions.
dc.description11 pages, accepted for publication in Astronomy and Astrophysics
dc.identifierhttps://arxiv.org/abs/astro-ph/0309753
dc.identifierhttp://arxiv.org/abs/astro-ph/0309753
dc.identifierAstron.Astrophys. 413 (2004) 121-130
dc.identifierdoi:10.1051/0004-6361:20031517
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/6573
dc.subjectAstrophysics
dc.titleThe Host Galaxy of GRB 990712
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