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Astron. Astrophys. 354, 802-814 (2000)

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Initial mass function in star formation complexes in galaxies

F. Sakhibov 1,2 and M. Smirnov 1

1 Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya str. 48, 109017 Moscow, Russia (fsakhibov@debitel.net)
2 Insitute of Astrophysics, Tajik Academy of Sciences, Bukhoro str. 22, Dushanbe, 734042, Tajikistan

Received 30 November 1998 / Accepted 3 December 1999


Star formation properties (slope [FORMULA], upper mass limit [FORMULA] of IMF, age t) of 105 star formation complexes (SFCs) in 20 galaxies are estimated by inverting their observed integrated colours into parameters of star formation. Mass functions of individual star formation complexes are studied in three spirals, one irregular and one peculiar galaxy. The derived stellar initial mass functions (IMFs) in the studied galaxies are close to the Salpeter IMF with slopes [FORMULA]. The calculated star formation rate (SFR) shows a burst of star formation in the peculiar colliding galaxy NGC 4038/39. The changes in star formation properties between different galaxies are related to the changes in individual SFCs mass functions and the correlation of the IMF of individual SFCs with their mass.

Key words: methods: data analysis – stars: formation – stars: luminosity function, mass function – ISM: H ii regions – galaxies: star clusters – galaxies: stellar content

Send offprint requests to: F. Sakhibov

© European Southern Observatory (ESO) 2000

Online publication: February 25, 2000