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Date and Time of the Query: 2019-05-19 T14:53:15 PDT
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For refcode 1988ApJ...334..144K:
Retrieve 95 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
1988ApJ...334..144K PROPERTIES OF H II REGION POPULATIONS IN GALAXIES. I. THE FIRST-RANKED H II REGIONS ROBERT C. KENNICUTT, JR. Department of Astronomy, University of Minnesota Received 1988 March 14; accepted 1988 April 25 ABSTRACT H{alpha} photometry of the brightest H II regions in 95 nearby spiral and irregular galaxies has been used to investigate the dependence of the H II region populations on the properties of their parent galaxies. The first-ranked H II regions span a range of four orders of magnitude in luminosity, and their properties are correlated with luminosities and Hubble types of their parent galaxies. The brightest H II regions in Magellanic irregular galaxies are approximately 50 times brighter than those in early-type spirals of the same absolute magnitude. This change results from both an increase in the numbers of H II regions in late-type galaxies and a physical change in the characteristic sizes of the star-forming regions. Similar trends are observed in the diameters of the brightest H II regions and in the magnitudes of the first-ranked stellar associations. The properties of the first-ranked H II regions are also correlated with absolute magnitude, but these correlations can be explained as arising from simple size-of-sample selection effects. Subject headings: galaxies: photometry - galaxies: structure - nebulae: H II regions
Retrieve 95 NED objects in this reference.
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