Revealing high-redshift galaxies: results from a new damped Lyman-alpha system survey.

Details Revealing high-redshift galaxies: results from a new damped Lyman-alpha system survey. Revealing high-redshift galaxies: results from a new damped Lyman-alpha system survey.

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000msngr.102...23e&link_type=abstract

The Messenger, vol. 102, p. 23-24

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Using quasar absorption lines as a tool to probe matter in the line of sight towards high-redshift quasars has proved to be a powerful technique for studying both galaxies and the intergalactic medium (IGM) alike. High-resolution echelle spectrographs such as UVES on the VLT can now deliver exquisite data which probe the structure and chemical enrichment of the highredshift universe with unparalleled accuracy. At somewhat lower resolution, instruments such as FORS can provide an efficient means with which to identify the high column density systems that are associated with distant galaxies. Within the menagerie of systems that make up the quasar absorption line ‘zoo', Damped Lyman Alpha systems (DLAs) have the highest column densities and are traditionally defined as systems with neutral hydrogen column densities N(H I) ³ 2 ´ 1020 atoms cm- 2. Although DLAs are thought to be the progenitors of present- day galaxies, the precise nature of these absorbers at high redshift is still unclear. At low redshift, however, there is mounting evidence that DLAs are likely to represent a mixed morphological bag (Le Brun et al 1997), including a significant population of LSBs (Bowen et al. 2000).

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