Giant disk galaxies, dwarfs and Lyman alpha clouds.

Details Giant disk galaxies, dwarfs and Lyman alpha clouds. Giant disk galaxies, dwarfs and Lyman alpha clouds.

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phr...311..429s&link_type=abstract

Physics Reports, Vol. 311, No. 3 - 5, p. 429 - 437

Physics

Disk Galaxies: Classification, Galaxy Groups: Lyman-Alpha Forest

Scientific paper

If one omits early-type galaxies and high-density regions, disk galaxies form a one-dimensional sequence, characterized by galaxy mass (or rotation velocity). This sequence has a top and a bottom end. Three stages are involved in the formation of a galaxy and the complexities explain why the sequence has these two distinct ends. The numerous, low-column-density Lyman alpha forest' absorption lines at low redshift seem to be mainly associated with galaxy groups, rather than with individual galaxies. Failed dwarf galaxies near the bottom end of the mass sequence (where thermal equilibrium matches the virial temperature) are attractive candidates for providing the absorption.

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