The spatial distribution of blue compact galaxies in the second Byurakan survey

Details The spatial distribution of blue compact galaxies in the second Byurakan survey The spatial distribution of blue compact galaxies in the second Byurakan survey

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...443..499p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 443, no. 2, p. 499-513

Astronomy and Astrophysics

Astronomy

60

Compact Galaxies, Galactic Clusters, Galactic Evolution, Line Spectra, Spatial Distribution, Astronomical Maps, Astronomical Spectroscopy, Dark Matter, Red Shift, Sky Surveys (Astronomy), Star Formation, Statistical Analysis

Scientific paper

We present the results of a study of the spatial distribution relative to bright normal galaxies of a new large sample of blue compact galaxies (BCGs) in the zone of the Second Byurakan Survey (SBS) alpha greater than or equal to 7 hr 40 min and less than or equal to 17 hr 20 min, delta greater than or equal to 49 deg and less than or equal to 61.2 deg, using as statistic the distance DNN to the nearest neighboring bright galaxy. We found that the majority (approximately 80%) of BCGs have DNN less than 5/h Mpc and follow generally the large-scale structure delineated by bright galaxies, but that a minority (approximately 20%) have DNN greater than 5/h Mpc and are found in voids. The large deficiency of BCGs with DNN less than or approximately equal to 2/h Mpc supports the hypothesis that the majority of dwarf galaxies originate as low-mass primordial density fluctuations but not as debris resulting from tidal interactions between massive galaxies. The spatial distribution of BCGs is consistent with that found for low-surface-brightness (LSB) dwarfs, supporting the idea that BCGs are LSB dwarfs undergoing intense bursts of star formation.

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