Damped Lyman-α Systems

Details Damped Lyman-α Systems Damped Lyman-α Systems

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ap%26ss.265..483p&link_type=abstract

Astrophysics and Space Science, v. 265, Issue 1/4, p. 483-486 (1999).

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

Damped Lyman-α systems observed in the spectra of high-redshift quasars are considered as the progenitors of present-day galaxies.Indeed, the large neutral hydrogen column densities observed and the presence of metals imply that the gas is somehow closely associated with regions of star formation. The nature of the absorbing object is unclear however.The discussion of whether high-redshift damped Lyman-α systems are produced throughlarge, fast-rotating, thick disks or through building-blocks of galaxies is important since it is related to how present-day galaxies form, either through initial formation of large disks and subsequent accretion of gas or as a result of merging of pregalactic clumps.We argue here that damped Lyman-α systems are progenitors of any kind of galaxy (dwarfs and large spirals); they trace peaks in the spatial density distribution of the gas.

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