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Peer-reviewedCC BYAstronomy & Astrophysics

New galaxy cluster in the zone of avoidance SRGe CL0512.7+3712

  • Khabibullin Ildar1
  • Churazov Eugene1
  • Lyskova Natalya2
  • Bikmaev Ilfan3
  • Irtuganov Eldar3
  • Suslikov Mikhail3
  • Zaznobin Igor2
  • Forman William R.4
  • Kraft Ralph4
  • Sunyaev Rashid1
  • Moiseev Alexei5
  • Sarkisyan Arkadiy5
5 affiliations
  1. 1Max Planck Institute for Astrophysics
  2. 2Space Research Institute (IKI)
  3. 3Kazan Federal University
  4. 4Center for Astrophysics, Harvard & Smithsonian
  5. 5Special Astrophysical Observatory, Russian Academy of Sciences
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Abstract

The census of massive clusters of galaxies in the local Universe is almost complete, thanks to their prominent observational signatures at X-ray, optical, and submillimeter wavelengths. Nevertheless, a number of such systems are likely to be missing and hidden behind the plane of our Galaxy, where high interstellar absorption as well as strong contamination by foreground stellar and diffuse sources prevent detection of even the brightest and the most massive ones. Here we report the discovery and multiwavelength characterization of such a cluster in the zone of avoidance (ZoA) SRGe CL0512.7+3712 in the data of the SRG/eROSITA all-sky survey. Combining the data of radio, optical, and infrared surveys, we identify an overdensity of possible red-sequence galaxies, as well as the candidate brightest cluster galaxy. Follow-up optical and X-ray observations confirm that the newly found object is a massive (M500c = (4–5) · 1014M⊙, kT ≈ 5 keV) galaxy cluster at redshift z = 0.0745 with possible indications of an unrelaxed dynamical scale. Location and elongation of this cluster are 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. Examination of X-ray, radio, and infrared data in the locations of the ZoA, where similar objects are expected to be found based on the large-scale structure properties, might reveal another ~10 clusters at this redshift in the future.

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Cite

BibTeXRIS
BibTeX
@article{ildar2026galaxy,
  title = {{New galaxy cluster in the zone of avoidance SRGe CL0512.7+3712}},
  author = {Khabibullin Ildar and Churazov Eugene and Lyskova Natalya and Bikmaev Ilfan and Irtuganov Eldar and Suslikov Mikhail and Zaznobin Igor and Forman William R. and Kraft Ralph and Sunyaev Rashid and Moiseev Alexei and Sarkisyan Arkadiy},
  journal = {Astronomy \& Astrophysics},
  year = {2026},
  month = oct,
  doi = {10.1051/0004-6361/202661093},
  url = {https://doi.org/10.1051/0004-6361/202661093},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - New galaxy cluster in the zone of avoidance SRGe CL0512.7+3712
AU  - Khabibullin Ildar
AU  - Churazov Eugene
AU  - Lyskova Natalya
AU  - Bikmaev Ilfan
AU  - Irtuganov Eldar
AU  - Suslikov Mikhail
AU  - Zaznobin Igor
AU  - Forman William R.
AU  - Kraft Ralph
AU  - Sunyaev Rashid
AU  - Moiseev Alexei
AU  - Sarkisyan Arkadiy
PY  - 2026
DA  - 2026/10/24
JO  - Astronomy & Astrophysics
DO  - 10.1051/0004-6361/202661093
UR  - https://doi.org/10.1051/0004-6361/202661093
AB  - The census of massive clusters of galaxies in the local Universe is almost complete, thanks to their prominent observational signatures at X-ray, optical, and submillimeter wavelengths. Nevertheless, a number of such systems are likely to be missing and hidden behind the plane of our Galaxy, where high interstellar absorption as well as strong contamination by foreground stellar and diffuse sources prevent detection of even the brightest and the most massive ones. Here we report the discovery and multiwavelength characterization of such a cluster in the zone of avoidance (ZoA) SRGe CL0512.7+3712 in the data of the SRG/eROSITA all-sky survey. Combining the data of radio, optical, and infrared surveys, we identify an overdensity of possible red-sequence galaxies, as well as the candidate brightest cluster galaxy. Follow-up optical and X-ray observations confirm that the newly found object is a massive (M500c = (4–5) · 1014M⊙, kT ≈ 5 keV) galaxy cluster at redshift z = 0.0745 with possible indications of an unrelaxed dynamical scale. Location and elongation of this cluster are 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. Examination of X-ray, radio, and infrared data in the locations of the ZoA, where similar objects are expected to be found based on the large-scale structure properties, might reveal another ~10 clusters at this redshift in the future.
SN  - 0004-6361
SN  - 1432-0746
ER  -