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For refcode 1996AJ....112..871B:
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1996AJ....112..871B COMPACT GROUP SELECTION FROM REDSHIFT SURVEYS ELIZABETH BARTON AND MARGARET J. GELLER Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 Electronic mail: ebarton@cfa.harvard.edu, mgeller@cfa.harvard.edu MASSIMO RAMELLA Osservatorio Astronomico di Trieste, via G. B. Tiepolo N. 11, I-34131 Trieste, Italy Electronic mail: ramella@oat.ts.astro.it RONALD O. MARZKE Dominion Astrophysical Observatory, 5071 West Saanich Road, Victoria, BC V8X 4M6, Canada Electronic mail: marzke@dao.hrc.ca L. NICOLACI DA COSTA1 European Southern Observatory, Karl-Schwarzschild-Strasse 2,85748 Garching bei Munchen, Germany Electronic mail: ldacosta@eso.org Received 1996 April 26; revised 1996 June 13 ABSTRACT For the first time, we construct a catalog of compact groups selected from a complete, magnitude-limited redshift survey. We select groups with N >= 3 members based on projected separation and association in redshift space alone. We evaluate the characteristics of the Redshift Survey Compact Groups (RSCG's). Their physical properties (membership frequency, velocity dispersion, density) are similar to those of the Hickson [ApJ, 255,382(1982)) Compact Groups. Hickson's isolation criterion is a strong function of the physical and angular group radii and is a poor predictor of the group environment. In fact, most RSCG's are embedded in dense environments. The luminosity function for RSCG's is mildly inconsistent with the survey luminosity function - the characteristic luminosity is brighter and the faint end shallower for the RSCG galaxies. We construct a model of the selection function of compact groups. Using this selection function, we estimate the abundance of RSCG's; for groups with N >= 4 members the abundance is 3.8 x 1O^-5^h^3^ Mpc^-3^. For all RSCG's (N >= 3) the abundance is 1.4 x 1O^-4^h^3^ Mpc^-3^.
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