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

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 (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.

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

References in corpus (3)

• Breathing in Low Mass Galaxies: A Study of Episodic Star Formation
• A view of the M81 galaxy group via the H-alpha window
• The stellar content of the isolated transition dwarf galaxy DDO210

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• An H-alpha Imaging Survey of Galaxies in the Local 11 Mpc Volume
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• A Catalog of Holes and Shells in the Interstellar Medium of the LITTLE THINGS Dwarf Galaxies
• New Halpha flux measurements in nearby dwarf galaxies