Other
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..815r&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 103, March 1992, p. 815-823.
Other
56
H Alpha Line, H Ii Regions, Molecular Gases, Star Formation, Stellar Luminosity, Galactic Structure, Gray Scale, Spiral Galaxies
Scientific paper
An investigation of the H II region LF of M51, complete down to a luminosity of about 10 exp 37.6 ergs/s, is presented. A total of 616 regions were identified from a deep H-alpha exposure: 480 in the 'arm' regions, and 136 in the 'interarm' regions. The differential LF shows a significant steepening above 10 exp 39.0 ergs/s. In the region below this break but above the completeness limit, where almost all of the H II regions lie, the slope of the LF is about 1.55, which is rather shallow compared to other spirals and even irregular galaxies. The 616 H II regions account for about 45 percent of the total H-alpha luminosity of 1.8 x 10 exp 41 ergs/s. A real difference in slope is found between the arm and interarm LFs over the luminosity range extending from the completeness limits to the break at 10 exp 39.0 ergs/s: 1.48 +/-0.07 vs -2.05 +/-0.15. The effects of blending of H II regions on the LF are addressed.
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