We present the results of optical identifications and spectroscopic redshifts measurements for galaxy clusters from 2-nd Planck catalogue of Sunyaev-Zeldovich sources (PSZ2), located at high redshifts, z≈0.7−0.9. We used the data of optical observations obtained with Russian-Turkish 1.5-m telescope (RTT150), Sayan observatory 1.6-m telescope, Calar Alto 3.5-m telescope and 6-m SAO RAS telescope (Bolshoi Teleskop Alt-azimutalnyi, BTA). Spectroscopic redshift measurements were obtained for seven galaxy clusters, including one cluster, PSZ2 G126.57+51.61, from the cosmological sample of PSZ2 catalogue. In central regions of two clusters, PSZ2 G069.39+68.05 and PSZ2 G087.39-34.58, the strong gravitationally lensed background galaxies are found, one of them 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.
@article{arxiv.1801.04464,
title = {Optical identifications of high-redshift galaxy clusters from Planck Sunyaev-Zeldovich survey},
author = {R. A. Burenin and I. F. Bikmaev and I. M. Khamitov and I. A. Zaznobin and G. A. Khorunzhev and M. V. Eselevich and V. L. Afanasyev and S. N. Dodonov and J. A. Rubiño-Martín and N. Aghanim and R. A. Sunyaev},
journal= {arXiv preprint arXiv:1801.04464},
year = {2018}
}
Comments
12 pages, 9 figures. Accepted for publication in Astronomy Letters