| Issue |
A&A
Volume 479, Number 2, February IV 2008
|
|
|---|---|---|
| Page(s) | 603 - 624 | |
| Section | Online catalogs and data | |
| DOI | https://doi.org/10.1051/0004-6361:20078652 | |
| Published online | 04 December 2007 | |
Canes Venatici I cloud of galaxies seen in the Hα line
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
We present results of Hα imaging for 42 galaxies in the nearby
low-density cloud Canes Venatici I, populated mainly by late-type objects.
Estimates of the Hα flux and integrated star formation rate (
)
are now available for all 78 known members of this scattered system,
spanning a large range in luminosity, surface brightness, HI content and
. Distributions of the CVnI galaxies versus their , 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 . Most of them also
possess a supply of gas that is sufficient to maintain their observed s
during the next Hubble time.
Key words: galaxies: evolution / galaxies: ISM / galaxies: dwarf
© ESO, 2008
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