Abstract
view Abstract Citations (57) References (40) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Metal Enrichment, Dust, and Star Formation in Galaxies at High Redshifts. II. Lyman-Alpha Emission from the Z = 2.465 Absorber toward Q0836+113 Hunstead, Richard W. ; Pettini, Max ; Fletcher, Andre B. Abstract QSO absorption systems with damped Lyα lines have been suggested as the high-redshift progenitors of present-day galaxies. As part of a survey of element abundances and star formation rates in these systems, we have obtained long-slit, 1.5 A resolution spectroscopic observations of the z_em_ = 2.67 QSO 0836+113. We report the detection of a narrow emission line (at a 4.0-4.5 σ level), centered in the black core of the damped Lyα absorption line at z_abs_= 2.465, which we interpret as Lyα from star-forming H II regions associated with the z = 2.465 galaxy. This is the first detection of Lyα emission from a galaxy identified by its absorption signature. The narrow velocity width of the emission line (FWHM < 60 km s^-1^), its small spatial extent (< 9 x 17 kpc), and its close alignment with the QSO sightline argue in favor of this damped system arising in a gas-rich H II galaxy. The inferred star formation rate, derived from the observed Lyα luminosity, is ~ 1 M_sun_ yr^-1^. This is directly comparable with rates measured for nearby H II galaxies and consistent with limits for damped Lyα systems set by other workers. We discuss the implications of the detection on future observational studies, emphasizing the need for low detector noise and high signal-to- noise ratio (S/N) for the sky background. In this particular case, the emission region is probably confined within 1" of the sightline to the QSO, making it very difficult to achieve a detection by narrow-band imaging. Publication: The Astrophysical Journal Pub Date: June 1990 DOI: 10.1086/168811 Bibcode: 1990ApJ...356...23H Keywords: Cosmic Dust; Galaxies; Lyman Alpha Radiation; Metallicity; Quasars; Star Formation; Absorption Spectra; Abundance; Emission Spectra; H Ii Regions; Red Shift; Star Formation Rate; Astrophysics; GALAXIES: FORMATION; GALAXIES: INTERSTELLAR MATTER; NEBULAE: H II REGIONS; QUASARS; STARS: FORMATION full text sources ADS | data products SIMBAD (2) NED (2) MAST (1) Related Materials (2) Part 1: 1990ApJ...348...48P Part 3: 1994ApJ...426...79P
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