The Environment of Star-Forming Dwarf Galaxies |
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Authors: | KG Noeske J Iglesias-Páramo JM Vílchez KJ Fricke |
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Institution: | 1. Universit?ts–Sternwarte, G?ttingen, Germany 2. Instituto de Astrofísica de Canarias, E-38200, La Laguna, Tenerife, Spain
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Abstract: | 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=75km 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.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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