A Deep VLA Radio Continuum Study of the Core and Outskirts of the Coma Cluster

Details A Deep VLA Radio Continuum Study of the Core and Outskirts of the Coma Cluster A Deep VLA Radio Continuum Study of the Core and Outskirts of the Coma Cluster

2009-02-19

arxiv.org/abs/0902.3349v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

26 pages, accepted for publication in AJ

Scientific paper

10.1088/0004-6256/137/5/4436

We present deep 1.4GHz Very Large Array (VLA) radio continuum observations of two ~half square degree fields in the Coma cluster of galaxies. The two fields, "Coma 1" and "Coma 3," correspond to the cluster core and southwest infall region and were selected on account of abundant pre-existing multiwavelength data. In their most sensitive regions the radio data reach 22 uJy rms per 4.4" beam, sufficient to detect (at 5-sigma) Coma member galaxies with log(L) = 20.11 W/Hz. The full catalog of radio detections is presented herein and consists of 1030 sources detected at >=5 sigma, 628 of which are within the combined Coma 1 and Coma 3 area. We also provide optical identifications of the radio sources using data from the Sloan Digital Sky Survey (SDSS). The depth of the radio observations allows us to detect AGN in cluster elliptical galaxies with Mr < -20.5 (AB magnitudes), including radio detections for all cluster ellipticals with Mr < -21.8. At fainter optical magnitudes (-20.5 < Mr <~ -19) the radio sources are associated with star-forming galaxies with star formation rates as low as 0.1 solar masses per year.

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