3 years ago

Optical identifications of high-redshift galaxy clusters from Planck Sunyaev-Zeldovich survey.

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

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, $z\approx0.7-0.9$. 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, $z\approx0.8$.

Publisher URL: http://arxiv.org/abs/1801.04464

DOI: arXiv:1801.04464v1

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