Computer Science
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sgyu.conf..157h&link_type=abstract
Studies of Galaxies in the Young Universe with New Generation Telescope, Proceedings of Japan-German Seminar, held in Sendai, Ja
Computer Science
Scientific paper
Because of their low gravitational energies dwarf galaxies are greatly exposed to energetical influences by their interstellar medium or by their environment. As an explanation for the low metallicities in dwarf irregular galaxies the action of supernova-driven galactic winds is widely accepted. Nonetheless, the reason for their low N/O ratios at also low O abundance is not yet completely understood. In order to reproduce the N/O - O peculiarity, a stepwise element release and multiple starbursts combined with a selective element expulsion by means of galactic winds are invoked by many authors. From chemo-dynamical models at low gravitational potentials like in dwarf galaxies, however, this scenario can be excluded because strong evaporation of interstellar clouds embedded in the hot supernova gas leads to a large-scale homogenization of abundance ratios. This is also supported by lacking radial abundance gradients in spatially resolved observations. Since recently studied intermediate-redshift compact narrow emission-line galaxies have already reached the track of secondary nitrogen production in the N/O-O-diagram, the N/O-O regime of observed present-day starburst dIrrs can be reached by the infall of intergalactic almost primordial gas and the subsequent enhancement of star formation, by this revitalizing the dwarf galaxy. This plausible explanation is supported by the growing evidence of HI envelopes around starburst dwarf galaxies.
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