Environments of Redshift Survey Compact Groups of Galaxies

Details Environments of Redshift Survey Compact Groups of Galaxies Environments of Redshift Survey Compact Groups of Galaxies

1998-06-30

arxiv.org/abs/astro-ph/9806397v1

Astronomy and Astrophysics

Astrophysics

35 pages, including 10 figures and 5 tables, accepted for publication in the Astronomical Journal

Scientific paper

10.1086/300531

Redshift Survey Compact Groups (RSCGs) are tight knots of N >= 3 galaxies selected from the CfA2+SSRS2 redshift survey. The selection is based on physical extent and association in redshift space alone. We measured 300 new redshifts of fainter galaxies within 1 h^{-1} Mpc of 14 RSCGs to explore the relationship between RSCGs and their environments. 13 of 14 RSCGs are embedded in overdense regions of redshift space. The systems range from a loose group of 5 members to an Abell cluster. The remaining group, RSCG 64, appears isolated. RSCGs are isolated and distinct from their surroundings to varying degrees, as are the Hickson Compact Groups. Among the 13 embedded RSCGs, 3 are distinct from their general environments (RSCG 9, RSCG 11 and RSCG 85).

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