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Issue A&A
Volume 479, Number 2, February IV 2008
Page(s) 603 - 624
Section Online catalogs and data
DOI http://dx.doi.org/10.1051/0004-6361:20078652



A&A 479, 603-624 (2008)
DOI: 10.1051/0004-6361:20078652

Canes Venatici I cloud of galaxies seen in the H$\alpha$ line

S. S. Kaisin and I. D. Karachentsev

Special Astrophysical Observatory, Russian Academy of Sciences, N. Arkhyz, KChR, 369167, Russia
    e-mail: ikar@luna.sao.ru

(Received 11 September 2007 / Accepted 25 September 2007)

Abstract
We present results of H$\alpha$ imaging for 42 galaxies in the nearby low-density cloud Canes Venatici I, populated mainly by late-type objects. Estimates of the H$\alpha$ flux and integrated star formation rate (${\it SFR}$) are now available for all 78 known members of this scattered system, spanning a large range in luminosity, surface brightness, HI content and ${\it SFR}$. Distributions of the CVnI galaxies versus their ${\it SFR}$, blue absolute magnitude and total hydrogen mass, are given in comparison with those for a population of the nearby virialized group around M 81. We found no essential correlation between star formation activity in a galaxy and its density environment. The bulk of CVnI galaxies had enough time to generate their baryon mass with the observed ${\it SFR}$. Most of them also possess a supply of gas that is sufficient to maintain their observed ${\it SFR}$s during the next Hubble time.


Key words: galaxies: evolution -- galaxies: ISM -- galaxies: dwarf



© ESO 2008


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