{
  "id": "2106.10455",
  "version": "v1",
  "published": "2021-06-19T09:00:35.000Z",
  "updated": "2021-06-19T09:00:35.000Z",
  "title": "X-ray sources in the 1.75 Ms Ultra Narrow Deep Field observed by XMM-Newton",
  "authors": [
    "M. Elías-Chávez",
    "A. L. Longinotti",
    "Y. Krongold",
    "C. Vignali",
    "F. Nicastro",
    "D. Rosa-González",
    "Y. D. Mayya",
    "S. Mathur"
  ],
  "comment": "30 pages, 19 figures, to be published in ApJ",
  "categories": [
    "astro-ph.GA",
    "astro-ph.HE"
  ],
  "abstract": "In this work we present the results of the survey carried out on one of the deepest X-ray fields observed by the XMM-Newton satellite. The 1.75 Ms Ultra Narrow Deep Field (XMM175UNDF) survey is made by 13 observations taken over 2 years with a total exposure time of 1.75 Ms (1.372 Ms after flare-filtered) in a field of $30' \\times 30' $ centered around the blazar 1ES 1553+113. We stacked the 13 observations reaching flux limits of $4.03 \\times 10^{-16} $, $1.3 \\times 10^{-15}$, and $9.8 \\times 10^{-16}\\, erg\\, s^{-1}\\, cm^{-2}$ in the soft $(0.2 - 2\\, \\mathrm{keV})$, hard $(2 - 12\\, \\mathrm{keV})$, and full $(0.2 - 12\\, \\mathrm{keV})$ bands, respectively. Using a conservative threshold of Maximum Likelihood significance of $ML \\geq 6$, corresponding to $3\\sigma$, we detected 301 point-sources for which we derived positions, fluxes in different bands, and hardness ratios. Thanks to an optical follow-up carried out using the 10.4m the Gran Telescopio Canarias (GTC) on the same field in the $u'g'r'i'z'$ bands, combined with WISE/2MASS IR data; we identified 244 optical/IR counterpart candidates for our X-ray sources and estimated their X-ray luminosities, redshift distribution, X-ray/optical $-$ X-ray/IR flux ratios, and absolute magnitudes. Finally, we divided this subsample in 40 non-active sources and 204 AGNs, of which 139 are classified as Seyfert galaxies and 41 as Quasars.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-06-19T09:00:35.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "ms ultra narrow deep field",
      "x-ray sources",
      "xmm-newton",
      "deepest x-ray fields",
      "observations reaching flux limits"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 30,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}