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PreprintCC BY 4.0arXiv

The extreme Disturbed Galaxy Cluster Sample (eDGeS): Spectroscopy and Dynamical Analysis of the eROSITA-Selected Merging Galaxy Cluster Candidate 1eRASS J025859.4-193727

  • Anish S. Aradhey
  • Eleazar R. Carrasco
  • Alfredo Zenteno
  • Rogério Monteiro-Oliveira
  • Facundo A. Gómez
  • Konstantina Boutsia
  • Esra Bulbul
  • Guillermo Damke
  • Amelia Ramirez
  • Hector Cuevas
Open at sourcePDFDOICite

Abstract

Addressing open questions such as the effect of galaxy cluster mergers on the evolution of galaxies and the self-interaction cross-section of dark matter requires the construction of a large, diverse sample of disturbed galaxy clusters. One contribution to such a sample is the extreme Disturbed Galaxy Cluster Sample (eDGeS), an ongoing spectroscopic study of massive disturbed and merging galaxy clusters selected from complementary surveys. Here, we present our first results from the eROSITA-selected subsample (eDGeS-eROSITA): a dynamical state analysis for the merging cluster candidate 1eRASS J025859.4-193727. We present the first spectroscopic redshift measurements for 76 galaxies in the direction of the cluster, confirming 51 as cluster members. The cluster displays a line-of-sight velocity dispersion of σcl=808+59−66 km s−1 and a dynamical mass of M200=4.47+0.94−0.93 × 1014 MSun. While the cluster shows no evidence for substructure along the line of sight, the projected distribution of member galaxies reveals three subclusters, only one of which appears associated with the cluster's X-ray contours. Phase-space analysis reveals a large fraction of recently infallen member galaxies. Together, this evidence suggests a cluster merger along the plane of the sky. Assuming that the two most massive subclusters are on outgoing (incoming) trajectories after their first pericentric passage, a two-body Monte Carlo model predicts that the two subclusters collided 0.50+0.20−0.22 Gyr (1.24+0.96−0.38 Gyr) ago.

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Cite

BibTeXRIS
BibTeX
@misc{aradhey2026extreme,
  title = {{The extreme Disturbed Galaxy Cluster Sample (eDGeS): Spectroscopy and Dynamical Analysis of the eROSITA-Selected Merging Galaxy Cluster Candidate 1eRASS J025859.4-193727}},
  author = {Anish S. Aradhey and Eleazar R. Carrasco and Alfredo Zenteno and Rogério Monteiro-Oliveira and Facundo A. Gómez and Konstantina Boutsia and Esra Bulbul and Guillermo Damke and Amelia Ramirez and Hector Cuevas},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.19509},
  eprint = {2609.19509},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.19509},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - The extreme Disturbed Galaxy Cluster Sample (eDGeS): Spectroscopy and Dynamical Analysis of the eROSITA-Selected Merging Galaxy Cluster Candidate 1eRASS J025859.4-193727
AU  - Anish S. Aradhey
AU  - Eleazar R. Carrasco
AU  - Alfredo Zenteno
AU  - Rogério Monteiro-Oliveira
AU  - Facundo A. Gómez
AU  - Konstantina Boutsia
AU  - Esra Bulbul
AU  - Guillermo Damke
AU  - Amelia Ramirez
AU  - Hector Cuevas
PY  - 2026
DA  - 2026/09/16
PB  - arXiv
DO  - 10.48550/arxiv.2609.19509
UR  - https://arxiv.org/abs/2609.19509
AB  - Addressing open questions such as the effect of galaxy cluster mergers on the evolution of galaxies and the self-interaction cross-section of dark matter requires the construction of a large, diverse sample of disturbed galaxy clusters. One contribution to such a sample is the extreme Disturbed Galaxy Cluster Sample (eDGeS), an ongoing spectroscopic study of massive disturbed and merging galaxy clusters selected from complementary surveys. Here, we present our first results from the eROSITA-selected subsample (eDGeS-eROSITA): a dynamical state analysis for the merging cluster candidate 1eRASS J025859.4-193727. We present the first spectroscopic redshift measurements for 76 galaxies in the direction of the cluster, confirming 51 as cluster members. The cluster displays a line-of-sight velocity dispersion of σ_cl=808^+59_−66 km s^−1 and a dynamical mass of M_200=4.47^+0.94_−0.93 × 10^14 M_Sun. While the cluster shows no evidence for substructure along the line of sight, the projected distribution of member galaxies reveals three subclusters, only one of which appears associated with the cluster's X-ray contours. Phase-space analysis reveals a large fraction of recently infallen member galaxies. Together, this evidence suggests a cluster merger along the plane of the sky. Assuming that the two most massive subclusters are on outgoing (incoming) trajectories after their first pericentric passage, a two-body Monte Carlo model predicts that the two subclusters collided 0.50^+0.20_−0.22 Gyr (1.24^+0.96_−0.38 Gyr) ago.
ER  -