The Environment of Star-Forming Dwarf Galaxies

Details The Environment of Star-Forming Dwarf Galaxies The Environment of Star-Forming Dwarf Galaxies

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ap%26ss.276..577n&link_type=abstract

Astrophysics and Space Science, v. 276, Issue 2/4, p. 577-583 (2001).

Astronomy and Astrophysics

Astrophysics

Scientific paper

We are currently performing a new analysis of the close environment of star-forming dwarf galaxies and its effects on their star-forming activity. For a sample of 142 thoroughly studied objects, we search the NASA Extragalactic Database for possible companion galaxies of any apparent luminosity and angular size. From a first analysis of a part of our sample, we find only about 50% of our objects to be isolated in the sense that no companion object was detected within a redshift difference of 500 km s^-1 and an angular separation corresponding to a projected distance of 1 Mpc, assuming H_0=75 km s^-1 Mpc^-1. By splitting the sample into different redshift intervals, we demonstrate an observational bias against low-luminosity companion objects which implies that a large fraction of star-forming dwarf galaxies, although lacking bright companions, might possess dwarf companion objects. Similarly to other authors, we find no evidence for a difference in star-forming activity due to the presence or absence of possible companions.

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