{
  "id": "2108.10036",
  "version": "v1",
  "published": "2021-08-23T09:53:07.000Z",
  "updated": "2021-08-23T09:53:07.000Z",
  "title": "Discovery of Galaxy Clusters with Chandra Discovery of Galaxy Clusters and a Head-Tail Radio Galaxy in the Direction of Globular Cluster NGC 6752",
  "authors": [
    "Zhongqun Cheng",
    "Xiaohui Sun",
    "Wei Wang",
    "Zhiyuan Li"
  ],
  "comment": "11 pages, 11 figures and 4 tables. Accepted for publication in MNRAS",
  "categories": [
    "astro-ph.HE",
    "astro-ph.GA"
  ],
  "abstract": "We report the discovery of CXOU J191100-595621 and CXOU J191012-595619, two galaxy clusters serendipitously detected in the direction of globular cluster NGC 6752, based on archival {\\it Chandra} observations with a total exposure time of $\\sim 344$ ks. The deep {\\it Chandra} X-ray data enabled us to measure properties of both systems, which result in a redshift of $z=0.239\\pm0.013$ and $z=0.375\\pm0.016$, a temperature of $kT=3.32^{+0.57}_{-0.46}$ keV and $kT=3.71^{+1.18}_{-0.86}$ keV, an iron abundance of $Z_{\\rm Fe}=0.64^{+0.34}_{-0.29}Z_{\\rm Fe\\odot}$ and $Z_{\\rm Fe}=1.29^{+0.97}_{-0.65}Z_{\\rm Fe\\odot}$, and a rest-frame full band (0.5-7 keV) luminosity of $L_{\\rm X}=9.2^{+1.2}_{-1.1}\\times 10^{43} {\\rm \\, erg\\, s^{-1}}$ and $L_{\\rm X}=9.9^{+2.7}_{-2.2}\\times 10^{43} {\\rm \\, erg\\, s^{-1}}$ for CXOU J191100-595621 and CXOU J191012-595619, respectively. The temperature profile of CXOU J191100-595621 is found to decreases with decreasing radius, indicating a cool core in this cluster. The hydrostatic equilibrium estimation suggests the clusters are moderately weighted, with $M_{500}=(1.3\\pm0.4)\\times 10^{14}\\, M_{\\odot}$ and $M_{500}=(2.0\\pm1.5)\\times 10^{14}\\, M_{\\odot}$, respectively. We search for optical and radio counterparts of X-ray point sources in the clusters. Three active galactic nuclei are found, among which one is identified with a narrow-angle-tail radio galaxy, and one is found to associated with the brightest central galaxy (BCG) of CXOU J191100-595621.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-08-23T09:53:07.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "galaxy clusters",
      "globular cluster ngc",
      "head-tail radio galaxy",
      "chandra discovery",
      "total exposure time"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}