The nature of low redshift damped Ly-α systems

Kanekar, Nissim ; Chengalur, Jayaram N. (1999) The nature of low redshift damped Ly-α systems Pramana - Journal of Physics, 53 (6). pp. 1013-1019. ISSN 0304-4289

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Damped Ly-α systems are the major repository of the observed neutral HI at high red-shift. These systems are most efficiently detected via absorption spectra taken against distant QSOs. In this paper, we review some of the observational constraints on the nature of these objects, and also discuss the implications of recent observations of two low redshift damped absorbers, made with the Giant Metrewave Radio Telescope. We find that, for the lowest redshift ( z = 0 . 0 9 1 2 ) damped Ly- α system, if the system is a rotating gas disk, then the total associated HI mass has to be less than 2 × 10 9 M € , if the disk is at low inclination angles, and less than 1010 M O if the system is edge on. All limits are 3 σ .

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Quasars; Absorption Lines; Galaxies; Evolution; ISM; General; Cosmology; Observations
ID Code:63596
Deposited On:29 Sep 2011 04:03
Last Modified:18 May 2016 12:19

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