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For refcode 1993AJ....106.1405P:
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Copyright by American Astronomical Society. Reproduced by permission
1993AJ....106.1405P STAR FORMATION IN THE DISKS OF H I-RICH S0 GALAXIES RICHARD W. POGGE Department of Astronomy, The Ohio State University, Columbus, Ohio 43210 Electronic mail: pogge@payne.mps.ohio-state.edu PAUL B. ESKRIDGE Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138 Electronic mail: eskridge@cfa268.harvard.edu Received 1993 March 12; revised 1993 June 28 ABSTRACT We present the results of a H{alpha} emission-line imaging survey of a sample of neutral-gas-rich S0 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} + [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 S0's 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 S0's without disk H II regions have a lower median M_HI_/L(B) than those with disk H II regions, but the distributions have a large range of dispersion. Our data suggest that S0's 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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