H II regions in M81 group dwarf galaxies

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Photometry, Dwarf Galaxies, Galactic Clusters, H Alpha Line, H Ii Regions, Star Formation Rate, Abundance, Galactic Evolution, Interstellar Extinction, Luminosity, Mass To Light Ratios, Size Distribution, Starburst Galaxies

Scientific paper

H-alpha images of the H II regions of five members of the M81 Group -- Ho I, Ho IX, M81dA, M81dB, and IC 2574 -- have allowed us to calculate their present star formation rates. The H II regions of the galaxies are normal in both their luminosity functions, which are power laws with shallow slopes (approximately -1.4), and in their size distribution, which fit exponentials (D0 approximately 50 pc). However, we find that there is a wide range of star formation activity as measured by the star formation and gas depletion timescales. Present star formation activity ranges from essentially zero for M81dA, which has no detected H II regions, to more active galaxies, such as IC 2574. M81dB appears to be in a burst phase.

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