Where galaxies collide. II - NGC 5195, the M51 system and the luminosity function of H II regions

Details Where galaxies collide. II - NGC 5195, the M51 system and the luminosity function of H II regions Where galaxies collide. II - NGC 5195, the M51 system and the luminosity function of H II regions

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.252..550t&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 252, Oct. 15, 1991, p. 550-557.

Astronomy and Astrophysics

Astronomy

16

H Ii Regions, Interacting Galaxies, Luminosity, Spiral Galaxies, Cosmic Dust, Emission Spectra, Galactic Structure, H Alpha Line, Star Formation

Scientific paper

The characteristics of the interstellar medium and massive star formation in the lenticular galaxy NTGC 5195 and adjacent overlying parts of the Whirlpool spiral are investigated via broadband red and H-alpha imaging. Although NGC 5195 has a moderate amount of interstellar gas, no visual line emission that is unambiguously associated with star formation in this galaxy is found. R and I images are used to compile a map of the obscuring dust distribution toward this galaxy. Good agreement is found between the distribution of the obscuration and published 21-cm H I maps. The map is used to correct the observed red image in order to reveal the unobscured stellar light distribution. The resultant image looks like a nearly normal S0 galaxy, but with a faint bar-like structure and ring. About 100 individual H II regions are identified in the image, which is used to derive the H-II-region LFs for the pair of northern spiral arms. It is concluded that the shape of the high-luminosity end of the H-II-region LF in galaxies is determined largely by the mass function of the molecular clouds.

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