Composite cummulative Halpha luminosity functions of HII regions
in galaxies of different
morphological type. The luminosity function is divided by the sum
of the luminositites of the galaxies that contribute to it
in units of 10E10 Lsolar. This shows that irregular (Im) galaxies
do not have an unusually large population of supergiant HII
regions for their luminosity. Rather, they contain HII regions in
relative numbers like that of other disk galaxies.
(Funded in part by the NSF through grant
AST-9802193 to DAH and by the Lowell Research Fund.
Work by AJY was funded by NSF through the
Research Experiences for Undergraduates program,
under grant number 9423921 to Northern Arizona University.)