Multifrequency windows on spiral galaxies. 4: Gas content and star formation on the Virgo cluster

Details Multifrequency windows on spiral galaxies. 4: Gas content and star formation on the Virgo cluster Multifrequency windows on spiral galaxies. 4: Gas content and star formation on the Virgo cluster

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...292....1b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 292, no. 1, p. 1-12

Statistics

Computation

27

Brightness, Computational Astrophysics, H I Regions, Infrared Windows, Interstellar Gas, Spiral Galaxies, Star Formation, Statistical Analysis, Stellar Physics, Virgo Galactic Cluster, Carbon Monoxide, H Alpha Line, Helium, Infrared Spectra, Photometers, Solar Neighborhood, Visible Spectrum

Scientific paper

We present a multifrequency statistical analysis of spiral galaxies belonging to the Virgo cluster using photometrical data available in the literature or taken by us. The analysis shows that in spiral galaxies the global star formation activity is tightly coupled with the atomic gas content, while it is almost independent of the molecular gas reservoir (as determined from the CO lines). In spiral discs the surface brightness of stars emitting in the visible and in the infrared H band is correlated with the H2 column density. This technique, in fact, is valid only in solar-neighbourhood environments, with abundant molecular gas and star formation, while it leads to an underestimate of the H2 content in those regions of spiral discs which have abundant cold molecular gas and low mass-star formation activity. In high-mass star formation regions, instead, the intense far-UV radiation field produced by young O-B stars partially photodissociates the diffuse molecular gas, weakening the expected relation between star formation and molecular gas content.

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