Star-forming regions in gas-rich lenticulars. I - H-alpha imaging of an initial sample of galaxies

Details Star-forming regions in gas-rich lenticulars. I - H-alpha imaging of an initial sample of galaxies Star-forming regions in gas-rich lenticulars. I - H-alpha imaging of an initial sample of galaxies

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93..291p&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, Feb. 1987, p. 291-300. Research supported by the University of California and Un

Other

72

Astronomical Spectroscopy, Galactic Structure, H Alpha Line, Star Formation, Charge Coupled Devices, Emission Spectra, Galactic Evolution, Gas Evolution, H Ii Regions, Peculiar Galaxies, Star Formation Rate

Scientific paper

The first results of an Hα imaging survey of H I rich S0 and S0/a galaxies are presented, in which the authors are searching for H II regions and other sources of emission (e.g., nuclear emission). Analysis of CCD Hα interference-filter images of 16 galaxies is reported. Eight of these galaxies show evidence for ongoing star formation (H II regions), one has nuclear emission but no H II regions, and the remaining seven have no emission detected with well-defined upper limits. In the peculiar galaxies, the emission from H II regions appears pervasive, while in the apparently normal galaxies the H II regions are either organized into inner-disk rings or randomly distributed throughout the disk. A few of the galaxies are found to be clearly not S0s, or peculiar objects atypical of the S0 class. Using simple models, star-formation rates are derived from the observed Hα fluxes, and an estimate of gas-depletion time scales is made.

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