Emission Line Spectroscopy of a Damped Lyman-alpha Absorbing Galaxy at z = 0.437

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dc.creatorGharanfoli, Soheila
dc.creatorKulkarni, Varsha P.
dc.creatorChun, Mark R.
dc.creatorTakamiya, Marianne
dc.date2006-09-18
dc.date.accessioned2026-07-07T11:26:04Z
dc.date.available2026-07-07T11:26:04Z
dc.descriptionWe present Keck/LRIS spectra of a candidate damped Lyman-alpha (DLA) galaxy toward the QSO 3C196 (z_em = 0.871). The DLA absorption system has a redshift of z_DLA = 0.437, and a galaxy at 1.5" from the QSO has been identified in high resolution imaging with WFPC2/HST. We have detected emission lines of [O II] 3727A, Hbeta, [O III] 5007A, Halpha and [N II] 6584A at the absorption redshift. Based on the emission lines, we have found the redshift of the galaxy to be z_em = 0.4376 +/- 0.0006. The emission lines also enabled us to calculate the extinction-corrected luminosities and metallicity indicators using established indices based on line strengths of different emission lines. These indicators suggest that the ISM of the DLA galaxy has a high metallicity comparable to or perhaps twice as much as solar (e.g. 12+log (O/H) = 8.98 +/- 0.07). Based on the strengths of Halpha and on the reddening derived from the relative strengths of Halpha and Hbeta, the star formation rate is 4.7 +/- 0.8 M_solar/yr. This places the galaxy in the range of gas-rich spiral galaxies.
dc.description24 pages, 7 figures, 2 tables, accepted for publication in AJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0609502
dc.identifierhttp://arxiv.org/abs/astro-ph/0609502
dc.identifierAstron.J.133:130-138,2007
dc.identifierdoi:10.1086/509618
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195705
dc.subjectAstrophysics
dc.titleEmission Line Spectroscopy of a Damped Lyman-alpha Absorbing Galaxy at z = 0.437
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