Optical Identifications of High-Redshift Galaxy Clusters from the Planck Sunyaev–Zeldovich Survey

R.A. Burenin , I.F. Bikmaev , I.M. Khamitov , I.A. Zaznobin , G.A. Khorunzhev , M.V. Eselevich , V.L. Afanasiev , S.N. Dodonov , J.A. Rubiño-Martín , N. Aghanim (1) , R.A. Sunyaev

1 IAS - Institut d'astrophysique spatiale

We present the results of optical identifications and spectroscopic redshift measurements for galaxy clusters from the second Planck catalogue of Sunyaev–Zeldovich sources (PSZ2) located at high redshifts, z ≈ 0.7−0.9. We used the data of optical observations with the Russian–Turkish 1.5-mtelescope (RTT-150), the Sayan Observatory 1.6-m telescope, the Calar Alto 3.5-m telescope, and the 6-m SAO RAS telescope (BTA). The spectroscopic redshift measurements were obtained for seven galaxy clusters, including one cluster, PSZ2 G126.57+51.61, from the cosmological sample of the PSZ2 catalogue. In the central regions of two clusters, PSZ2 G069.39+68.05 and PSZ2 G087.39−34.58, we detected arcs of strong gravitational lensing of background galaxies, one of which is at redshift z = 4.262. The data presented below roughly double the number of known galaxy clusters in the second Planck catalogue of Sunyaev–Zeldovich sources at high redshifts, z ≈ 0.8.

Mots clés: galaxy clusters; sky surveys

Domaines: Astrophysique [astro-ph]

R.A. Burenin, I.F. Bikmaev, I.M. Khamitov, I.A. Zaznobin, G.A. Khorunzhev, et al.. Optical Identifications of High-Redshift Galaxy Clusters from the Planck Sunyaev–Zeldovich Survey. Astronomy Letters / Pis'ma v Astronomicheskii Zhurnal, 2018, 44 (5), pp.297-308. ⟨10.1134/S1063773718050018⟩. ⟨hal-01703721⟩