Radio Galaxy Zoo: discovery of a poor cluster through a giant wide-angle tail radio galaxy

Abstract

We have discovered a previously unreported poor cluster of galaxies (RGZ-CL J0823.2+0333) through an unusual giant wide-angle tail radio galaxy found in the Radio Galaxy Zoo project. We obtained a spectroscopic redshift of $z=0.0897$ for the E0-type host galaxy, 2MASX J08231289+0333016, leading to M${}_r=-22.6$ and a $1.4$GHz radio luminosity density of $L_{1.4}=5.5\times 10^{24}$ W Hz${}^{-1}$. These radio and optical luminosities are typical for wide-angle tailed radio galaxies near the borderline between Fanaroff-Riley (FR) classes I and II. The projected largest angular size of $\approx 8$arcmin corresponds to $800$kpc and the full length of the source along the curved jets/trails is $1.1$Mpc in projection. X-ray data from the XMM-Newton archive yield an upper limit on the X-ray luminosity of the thermal emission surrounding RGZ J082312.9+033301,at $1.2-2.6\times 10^{43}$ erg s${}^{-1}$ for assumed intra-cluster medium temperatures of $1.0-5.0$keV. Our analysis of the environment surrounding RGZ J082312.9+033301 indicates that RGZ J082312.9+033301 lies within a poor cluster. The observed radio morphology suggests that (a) the host galaxy is moving at a significant velocity with respect to an ambient medium like that of at least a poor cluster, and that (b) the source may have had two ignition events of the active galactic nucleus with $10^7$yrs in between. This reinforces the idea that an association between RGZ J082312.9+033301, and the newly discovered poor cluster exists.

arXiv commentPublished in MNRAS

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