New Galaxy Cluster Discovered Behind the Zone of Avoidance

The paper reports the discovery and multiwavelength characterization of a new galaxy cluster, SRGe CL0512.7+3712, located in the Zone of Avoidance (ZoA). The ZoA is a region of the sky obscured by the plane of our Galaxy, making it difficult to detect objects behind it. The discovery was made using data from the SRG/eROSITA all-sky survey. Combining the data of radio, optical, and infrared surveys, the researchers identified an overdensity of possible red sequence galaxies, as well as the candidate brightest cluster galaxy. Follow-up optical and X-ray observations confirmed that the newly found object is a massive galaxy cluster with a mass of (4-5) * 10^14 solar masses and a redshift of z=0.0745. The cluster shows possible indications of unrelaxed dynamical scale. The location and elongation of this cluster is consistent with an expectation from the large-scale structure at this redshift, and it might be a part of an extended overdensity of such objects in the Galactic Anticenter direction. The authors suggest that examination of X-ray, radio, and infrared data in the locations of ZoA might reveal another ~10 clusters at this redshift in the future. This discovery highlights the incompleteness of the local Universe's galaxy cluster census due to obscuration by the Milky Way.

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