An H(alpha) Imaging Survey of the Centaurus Group Dwarf Irregular Galaxies

Details An H(alpha) Imaging Survey of the Centaurus Group Dwarf Irregular Galaxies An H(alpha) Imaging Survey of the Centaurus Group Dwarf Irregular Galaxies

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..213s&link_type=abstract

NOAO Proposal ID #1999A-0213

Computer Science

Scientific paper

The active Centaurus group is one of the nearest groups outside the Local group, at 3.5 Mpc, and is now known to contain numerous dwarf irregular galaxies (dIrrs). We propose to image in H(alpha) , with the 0.9m, the 20 dIrr members of the group. The H(alpha) fluxes will reveal their current global star formation rates. Comparing these rates to those of dwarfs in the Local, M81, and Sculptor groups will provide valuable clues to the importance of the environment in galactic evolution. This will also allow us to identify the brightest HII regions, for follow-up spectroscopy for chemical abundance studies. We expect some of these galaxies to possess some of the most primitive chemical environments known, ideal for studying the early stages of nucleosynthesis in galaxies. These galaxies will serve to test our ability to construct self-consistent star formation histories, i.e., compatible luminosities, colors, total and relative chemical abundances.

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