Identification of a galaxy responsible for a high-redshift Lyman-α absorption system

• Published in: Nature (London) 1996-07, Vol.382 (6588), p.234-236
• Main Authors: Djorgovski, S. G, Pahre, M. A, Bechtold, J, Elston, R
• Format: Article
• Language: English
• Subjects: Absorption; Astronomy; Characteristics and properties of external galaxies and extragalactic objects; Earth, ocean, space; Exact sciences and technology; Humanities and Social Sciences; letter; multidisciplinary; Origin, formation, evolution, age, and star formation; Science; Science (multidisciplinary); Stars & galaxies; Stellar systems. Galactic and extragalactic objects and systems. The universe
• ISSN: 0028-0836; 1476-4687
• DOI: 10.1038/382234a0

DAMPEDLyman-α systems are high-column-density intergalactic clouds of hydrogen, the existence of which is inferred from absorption lines appearing in the emission spectra of distant quasars. The galaxies believed to be responsible for these absorption systems have been suggested as possible progenitors of the normal disk galaxies observed in the local Universe 1 . Indeed, Lyman-α systems appear to contain a substantial fraction of the baryons known to exist in galaxies today 2,3 . Here we report the optical detection of a galaxy (designated DLA2233 + 131) associated with a known 4 damped Lyman-α absorption system at a redshift of z = 3.150. The properties of this galaxy correspond closely to those expected of a young disk galaxy in the early stages of formation, and show no evidence for an active nucleus. This finding gives strong support to the idea that damped Lyman-α systems represent a population of young galaxies at high red-shifts.