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PreprintarXiv licencearXiv

EP-FXT Observations of Abell 1795: X-ray properties and structure out to R200

  • Y. Tang
  • S. M. Jia
  • H. H. Zhao
  • C. K. Li
  • H. Yu
  • Y. Chen
  • S. S. Weng
  • X. Y. Zheng
  • H. Feng
  • L. M. Song
  • C. Z. Liu
  • F. J. Lu
11 more authors
  • S. N. Zhang
  • W. M. Yuan
  • S. Andreon
  • J. F. Wang
  • W. W. Cui
  • J. Guan
  • C. C. Jin
  • Y. Liu
  • J. Zhang
  • H. S. Zhao
  • X. F. Zhao
Open at sourcePDFDOICite

Abstract

We present deep X-ray observations of the nearby X-ray-luminous galaxy cluster Abell 1795 obtained with the Einstein Probe Follow-up X-ray Telescope EP-FXT, with a total exposure time of ∼ 480 ks. Exploiting the large field of view and low particle background of EP-FXT, we directly measured the radial temperature profile of A1795 out to R200 with full azimuthal coverage, which was shown to increase in line with the radius within 6' and then gradually decline toward larger radii. The surface-brightness residual map and 2D thermodynamic maps reveal a clockwise spiral structure extending from the cluster core towards the south-east, which traces low-temperature and low-entropy gas, which is also consistent with sloshing-induced cold fronts. In the north-west, the surface-brightness-enhanced region exhibits an arc-like high-temperature feature and both the temperature-derived and density-derived Mach numbers support the assumption that it is a weak shock. These substructures can be explained by a binary merger scenario: the perturbing subcluster induces sloshing during its first passage past the primary core and its subsequent return passage through the ICM might drive the shock towards the north-west. Our results indicate that relaxed galaxy clusters such as A1795 might still retain signatures of dynamical activity.

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Cite

BibTeXRIS
BibTeX
@misc{tang2026epfxt,
  title = {{EP-FXT Observations of Abell 1795: X-ray properties and structure out to $R_200$}},
  author = {Y. Tang and S. M. Jia and H. H. Zhao and C. K. Li and H. Yu and Y. Chen and S. S. Weng and X. Y. Zheng and H. Feng and L. M. Song and C. Z. Liu and F. J. Lu and S. N. Zhang and W. M. Yuan and S. Andreon and J. F. Wang and W. W. Cui and J. Guan and C. C. Jin and Y. Liu and J. Zhang and H. S. Zhao and X. F. Zhao},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2607.12816},
  eprint = {2607.12816},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.12816},
}
RIS
TY  - UNPB
TI  - EP-FXT Observations of Abell 1795: X-ray properties and structure out to R_200
AU  - Y. Tang
AU  - S. M. Jia
AU  - H. H. Zhao
AU  - C. K. Li
AU  - H. Yu
AU  - Y. Chen
AU  - S. S. Weng
AU  - X. Y. Zheng
AU  - H. Feng
AU  - L. M. Song
AU  - C. Z. Liu
AU  - F. J. Lu
AU  - S. N. Zhang
AU  - W. M. Yuan
AU  - S. Andreon
AU  - J. F. Wang
AU  - W. W. Cui
AU  - J. Guan
AU  - C. C. Jin
AU  - Y. Liu
AU  - J. Zhang
AU  - H. S. Zhao
AU  - X. F. Zhao
PY  - 2026
DA  - 2026/09/16
PB  - arXiv
DO  - 10.48550/arxiv.2607.12816
UR  - https://arxiv.org/abs/2607.12816
AB  - We present deep X-ray observations of the nearby X-ray-luminous galaxy cluster Abell 1795 obtained with the Einstein Probe Follow-up X-ray Telescope EP-FXT, with a total exposure time of ∼ 480 ks. Exploiting the large field of view and low particle background of EP-FXT, we directly measured the radial temperature profile of A1795 out to R_200 with full azimuthal coverage, which was shown to increase in line with the radius within 6' and then gradually decline toward larger radii. The surface-brightness residual map and 2D thermodynamic maps reveal a clockwise spiral structure extending from the cluster core towards the south-east, which traces low-temperature and low-entropy gas, which is also consistent with sloshing-induced cold fronts. In the north-west, the surface-brightness-enhanced region exhibits an arc-like high-temperature feature and both the temperature-derived and density-derived Mach numbers support the assumption that it is a weak shock. These substructures can be explained by a binary merger scenario: the perturbing subcluster induces sloshing during its first passage past the primary core and its subsequent return passage through the ICM might drive the shock towards the north-west. Our results indicate that relaxed galaxy clusters such as A1795 might still retain signatures of dynamical activity.
ER  -