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

Details Canes Venatici I cloud of galaxies seen in the H-alpha line Canes Venatici I cloud of galaxies seen in the H-alpha line

2007-10-03

arxiv.org/abs/0710.0711v1

Astronomy and Astrophysics

Astrophysics

33 pages, 5 figures. Astronomy and Astrophysics, accepted (figure 1 is available at this http://luna.sao.ru/halpha/articles/CV

Scientific paper

10.1051/0004-6361:20078652

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 (SFR) are now available for all 78 known members of this scattered system, spanning a large range in luminosity, surface brightness, HI content and SFR. Distributions of the CVnI galaxies versus their SFR, blue absolute magnitude and total hydrogen mass are given in comparison with those for a population of the nearby virialized group around M81. We found no essential correlation between star formation activity in a galaxy and its density environment. A bulk of CVnI galaxies had enough time to generate their baryon mass with the observed SFR. Most of them possess also a supply of gas sufficient to maintain their observed SFR's during the next Hubble time.

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