The Environments of a Complete, Moderate-Redshift Sample of FIRST Bent-Double Radio Sources

Details The Environments of a Complete, Moderate-Redshift Sample of FIRST Bent-Double Radio Sources The Environments of a Complete, Moderate-Redshift Sample of FIRST Bent-Double Radio Sources

2001-02-28

arxiv.org/abs/astro-ph/0102499v1

Astronomy and Astrophysics

Astrophysics

31 pages, accepted for publication in AJ

Scientific paper

10.1086/321074

We present an optical spectroscopic and imaging study of the environments of a complete sample of moderate-redshift, bent-double radio sources. More than half of the forty radio galaxies in the sample are associated with Abell richness class 0 or greater clusters at z<0.4. Most of the remaining objects are associated with groups, although a few appear to be hosted by nearly isolated elliptical galaxies. For the bent doubles appearing in poor environments, either dense gas must be associated with the systems to provide the ram pressure to bend the lobes, or alternative bending mechanisms will have to be invoked to explain the radio morphologies. Correlation with the ROSAT All Sky Survey Bright and Faint Source Catalogs reveals the majority of the z<0.2 objects in our sample that we classify optically as clusters are also X-ray sources.

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