Star formation in the disks of H I-rich S0 galaxies

Details Star formation in the disks of H I-rich S0 galaxies Star formation in the disks of H I-rich S0 galaxies

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1405p&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 4, p. 1405-1419.

Astronomy and Astrophysics

Astronomy

63

Disk Galaxies, Emission Spectra, Galactic Structure, H Alpha Line, Star Formation, Astronomical Spectroscopy, Image Processing, Sky Surveys (Astronomy)

Scientific paper

We present the results of a H-alpha emission-line imaging survey of a sample of neutral-gas-rich S galaxies. We find evidence of disk H II regions in 14 of our sample of 32 galaxies, detect nuclear or faint diffuse circumnuclear H-alpha + forbidden N II emission in another 11 galaxies without disk H II regions, and obtain upper limits for 8 galaxies. We find a striking dichotomy between Ss with and without H II regions; either a galaxy has a number of H II regions, most often distributed into distinct rings or ringlike structures, or there are none down to detection limits equivalent to a single unreddened H II region ionized by single O stars. We find that the S0s without disk H II regions have a lower median MH I/L(B) than those with disk H II regions, but the distributions have a large range of dispersion. Our data suggest that S0s may lie in a regime where local threshold effects, perhaps primarily kinematic in origin, are more important in determining the star formation in these galaxies than the global stability mechanisms that recent empirical models for large-scale star formation have suggested prevail in later-type spirals.

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