Other
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sgyu.conf..161b&link_type=abstract
Studies of Galaxies in the Young Universe with New Generation Telescope, Proceedings of Japan-German Seminar, held in Sendai, Ja
Other
Scientific paper
In the universe at redshift z = 0 dwarf galaxies dominate the normal galaxies at least in terms of number. Recently, more and more evidence accumulates, that the galaxy luminosity function is even rising at the faint end (the dwarf galaxies) in both galaxy clusters and the general field. While dwarf elliptical galaxies seem to be the predominant objects at the faint end of the galaxy luminosity function in clusters, in lower density environments the dwarf irregular galaxies dominate. The relation of the two classes is still not known. Some arguments call for a evolutionary link between them: gas-rich dwarf irregular galaxies develop into dwarf elliptical galaxies by means of a starburst-driven galactic wind. Other arguments call for two distinct populations with very different evolution. Depending on the chosen scenario, very different star-formation histories have to be present. This implies also very different observational signatures at intermediate and high redshift. Analysis of the Hubble Deep Field (HDF) implies that most of the small galaxies visible in the HDF are at relatively low redshift, calling for late formation of dwarf galaxies. On the other hand star-formation histories of local dwarf galaxies call exclusively for creation of these galaxies at relatively high redshift. I will discuss the recent results on the importance of dwarf galaxies in the early universe and try to link physical properties of the two observed subclasses of dwarf galaxies into the evolutionary picture.
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