Astronomy and Astrophysics – Astronomy
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.4304w&link_type=abstract
American Astronomical Society, 200th AAS Meeting, #43.04; Bulletin of the American Astronomical Society, Vol. 34, p.710
Astronomy and Astrophysics
Astronomy
Scientific paper
A sample of ~120 galaxies was chosen from the Hi Parkes All Sky Survey (HiPASS) to deduce details about star formation in nearby disk galaxies with no bias to optical surface brightness selection effects. Broad (B and R) and narrow band (Hα ) photometry was obtained for 69 of these. The sample is dominated by late-type, dwarf disks (mostly Sc and Sm galaxies). For 69 of these HiPASS galaxies, we measured the properties of the Hii regions on Hα , continuum subtracted images, using the HIIphot package developed by Thilker et al (2000). All but one of the galaxies contained at least one detectable Hii region. For each galaxy with sufficient objects, an Hii region luminosity function (LF) was obtained. The LFs typically peak at a luminosity fainter than ~1038 ergs s-1 and extend out to 1039 ergs s-1 or brighter. About 65% of the galaxies contain at least one Hii region with LHα >=1039 ergs s-1. When compared with Hii region LF data for early-type spirals, the slopes for the LFs of this sample are typically more shallow and the fraction of galaxies with at least one luminous HII region is significantly higher. Comparison of the total Hα flux to that from the Hii regions was used to estimated the amount of diffuse ionized gas (DIG) contained in each of these systems. A wide range of diffuse fractions was found; the typical value was similar to the values found for normal spirals.
Bothun Gragory D.
Helmboldt Joseph F.
O'Neil Karen
Walterbos Reinirus Antonius Maria
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