A galaxy cluster in the innermost Zone of Avoidance, close to the radio phoenix VLSSJ2217.5+594
arXiv:2105.07714 · doi:10.1051/0004-6361/202141056
Abstract
The steep spectrum radio source VLSSJ2217.5+5943 shows a complex, filamentary morphology and a curved spectrum. Therefore, the source has previously been classified as a radio phoenix. However, no galaxy cluster associated with this radio source has been confidently detected so far because the source is located in the direction of the innermost zone of the Galactic Plane at b = +2.4 degr (innermost Zone of Avoidance, ZoA). We analysed archival observations in the near infrared (UKIDSS) and mid infrared (Spitzer) to select the galaxies in the immediate neighbourhood of the radio source. A sample of 23 galaxies was selected as candidate cluster members. Furthermore, we carried out deep integral field spectroscopy covering 6450 to 10500 AA with the red unit of the Hobby-Eberly Telescope second generation low resolution spectrograph (LRS2-R). We also reanalysed archival GMRT observations at 325 and 610 MHz. We selected 23 galaxies within a radius of 2.5 arcmin, centered on RA=22:17.5, DEC=+59:43 (J2000). Spectra were obtained for three of the brightest galaxies. For two galaxies we derived redshifts of z = 0.165 and z = 0.161, based on NaD absorption and TiO band heads. Their spectra correspond to E-type galaxies. Both galaxies are spatially associated with VLSSJ2217.5+5943. The spectrum of the third galaxy, which is slightly more distant from the radio source, indicates a LINER at z = 0.042. It is apparently a foreground galaxy with respect to the cluster we identified. VLSSJ2217.5+5943 is associated with a massive galaxy cluster at redshift z = 0.163 +- .003, supporting its classification as radio phoenix.
12 pages, 11 figures, Astronomy & Astrophysics in press
References in corpus (13)
- The UKIRT Infrared Deep Sky Survey (UKIDSS)
- The UKIDSS Galactic Plane Survey
- The WFCAM Science Archive
- The Very Large Array Low-frequency Sky Survey Redux (VLSSr)
- The UKIRT Infrared Deep Sky Survey Early Data Release
- The Mid-Infrared Extinction Law in the Ophiuchus, Perseus, and Serpens Molecular Clouds
- The Second Data Release of the INT Photometric H-Alpha Survey of the Northern Galactic Plane (IPHAS DR2)
- Search and modelling of remnant radio galaxies in the LOFAR Lockman Hole field
- The 2MASS Redshift Survey in the Zone of Avoidance
- The 2MASS redshift survey galaxy group catalogue derived from a graph-theory based friends-of-friends algorithm
- The K-band luminosity functions of cluster galaxies
- Relative distribution of dark matter and stellar mass in three massive galaxy clusters
- Radio and near-infrared observations of the steep spectrum Galactic plane radio source WKB 0314+57.8