Latel-type galaxies - Star formation rates

Details Latel-type galaxies - Star formation rates Latel-type galaxies - Star formation rates

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...167...11i&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 167, no. 1, Oct. 1986, p. 11-24. In German.

Astronomy and Astrophysics

Astrophysics

12

Galactic Evolution, Galaxies, Image Processing, Star Formation, Star Formation Rate, Stellar Spectrophotometry, Hubble Constant, Hydrogen, Infrared Radiation, Interstellar Matter, Isophotes, Pixels

Scientific paper

An extremely simple method for the determination of star formation rates in external galaxies is presented. It is based on surface photometry in one colour only. Applying a new image filtering technique the intensity distributions of 59 late-type spiral and irregular galaxies have been devided into two components each, one containing the light of the smoothly distributed old disk population, the other one containing the light of the clumped extreme population I. This allows the determination of the ratios R1/>R< between the "present" star formation rates (for stars with ages T < 50×106years) and the average star formation rates. If the assumption of a constant Initial Mass Function is valid the results confirm the very high present star formation rates obtained by Kennicutt (1983) and Gallagher et al. (1984).

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