Journal Article

Hα survey of nearby dwarf galaxies

S. S. Kaisin, I. D. Karachentsev and S. Ravindranath

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 425, issue 3, pages 2083-2098
Published in print September 2012 | ISSN: 0035-8711
Published online September 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21501.x
Hα survey of nearby dwarf galaxies

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Abstract

We present the Hα imaging data and flux measurements for 30 dwarf galaxies in the Local Volume. The Hα fluxes are used to derive the galaxy star-formation rate (SFR). The sample of observed galaxies is characterized by the following parameters: a median distance of 7.5 Mpc, median blue absolute magnitude of −14.8 mag and median SFR of −2.0 dex. Two dSph members of the Local Group, Cetus and Leo IV, do not show signs of star formation, with rates of −5.4 and −7.0 dex, respectively. The BCD galaxy ESO 553−46 has one of the highest specific SFRs among the Local Volume galaxies.

Keywords: galaxies: dwarf; galaxies: star formation galaxies: starburst

Journal Article.  2843 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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