Radio Galaxy Zoo: discovery of a poor cluster through a giant wide-angle tail radio galaxy
2016
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 × 10 24 W Hz −1 . These radio and optical luminosities are typical for wide-angle
tailed radio galaxies near the borderline between Fanaroff–Riley classes I and II. The projected
largest angular size of ≈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 × 10 43 erg s −1 for assumed intracluster 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 yr in between. This reinforces the idea
that an association between RGZ J082312.9+033301 and the newly discovered poor cluster
exists.
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