Ionizing radiation flux and star formation rate in the Galaxy

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galactic Radiation, Ionizing Radiation, Milky Way Galaxy, Radiant Flux Density, Star Formation, Star Formation Rate, Chemical Composition, Early Stars, Star Clusters, Stellar Luminosity, Stellar Mass, Stellar Rotation, Stellar Structure

Scientific paper

Ionizing fluxes (the Lyman continuum photon flux) for temperatures of 15,000-55,000 K and lg g values of 3.5 and 4.0 are computed on the basis of Mihalas' NLTE model atmosphere (1972). Ionizing luminosities of early type stars of various masses are derived. Ionizing luminosities of young clusters are found using the mass function obtained from star counts. The lg L - lg Nc relation was derived taking the following factors into account: (1) variations of chemical composition; (2) star rotation up to critical velocity; and (3) variations of mass function index. If these effects are taken into account, most sources fall within the lg L - lg Nc correlation region, and the assumption of the absorption of some ionizing photons by dust becomes unnecessary.

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