The luminosities of bright H II regions in NGC 628 and its O star formation rate

Details The luminosities of bright H II regions in NGC 628 and its O star formation rate The luminosities of bright H II regions in NGC 628 and its O star formation rate

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100..403v&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 100, Aug. 1990, p. 403-414.

Astronomy and Astrophysics

Astronomy

27

Charge Coupled Devices, H Ii Regions, Luminosity, Star Formation Rate, Stellar Mass, Early Stars, Star Clusters, Stellar Atmospheres, Stellar Evolution, Wolf-Rayet Stars

Scientific paper

H-alpha photometric observations of the face-on Sc spiral galaxy NGC 628, obtained using 10-nm-bandwidth filters and a CCD detector on the 1.5-m Palomar telescope during October 1985, are reported and analyzed. Absolute luminosities are determined for 183 bright H II regions, and it is estimated that they contain clusters of about 100 young ionizing stars on average. Two theoretical models are constructed to explain the observed H II region luminosity function: in model (1) clusters differ only in the mass of gas involved in high-mass star formation and stellar evolution is ignored, while in model (2) clusters differ only in their state of evolution from initially identical conditions. Although both (1) and (2) can fit the observations, physical arguments are presented favoring (2), which also permits estimation of the slope of the massive-star initial mass function (near the Salpeter value of 2.35), the O-star formation rate (about 0.004/yr), the rate of type II SN (about 0.01/yr), and the number of WR stars in NGC 628 (about 800).

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