The Origin of Dwarf Galaxies and Steep Luminosity Functions in Clusters

Details The Origin of Dwarf Galaxies and Steep Luminosity Functions in Clusters The Origin of Dwarf Galaxies and Steep Luminosity Functions in Clusters

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10201c&link_type=abstract

HST Proposal ID #10201

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Hst Proposal Id #10201 Galaxies

Scientific paper

Clusters of galaxies contain an overdensity of dwarfs compared to the field. The origin of these dwarfs is unknown, but a large fraction of them did not form through standard collapses early in the universe. Some dwarf ellipticals in clusters have metal rich and young stellar populations while others contain old metal poor populations, suggesting multiple formation mechanisms and time scales. We propose to test the idea that dwarfs descend from galaxies accreted into clusters during the past 8 Gyrs by correlating ages and metallicities of dwarfs with their internal structures - spiral arms, bars, and disks. If dwarfs originate from more massive galaxies then these features should be common in metal rich and young dwarfs. On the other hand, if no correlation is found it would suggest that dwarfs form through in-situ collapses of gas in the intragalactic medium after the universe was reionized.

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