Properties of H II region populations in galaxies. II - The H II region luminosity function

Details Properties of H II region populations in galaxies. II - The H II region luminosity function Properties of H II region populations in galaxies. II - The H II region luminosity function

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...337..761k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 337, Feb. 15, 1989, p. 761-781.

Astronomy and Astrophysics

Astrophysics

343

Astronomical Photometry, H Ii Regions, Irregular Galaxies, Luminosity, Spiral Galaxies, Abundance, Brightness Distribution, Charge Coupled Devices, Emission Spectra, H Alpha Line, Star Formation

Scientific paper

H-alpha emission-line fluxes have been measured for all of the detected H II regions in 30 nearby spiral and irregular galaxies, and these data are used to study the behavior of the H II region luminosity functions (LFs). In most galaxies, the LF is well represented by a power law function. Both the normalization and the shape of the LF change systematically with Hubble type. Early-type spirals possess fewer H II regions of all luminosities, a steeper LF, and in many cases an upper cutoff or turnover in the LF. Taken together, these effects account for the virtual absence of 'supergiant' H II regions such as 30 Doradus in Sa-Sb galaxies. Most of the massive stars in late-type spiral and irregular galaxies form in large H II/OB complexes, while in early-type spirals the bulk of the massive star formation occurs in small regions ionized by no more than a few OB stars.

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