{
  "annotation_id": "20bdf7e1-d962-4cbf-b655-ff1d52bc3556",
  "date_created": "2026-02-17T05:53:08.815000Z",
  "date_modified": "2026-02-17T05:53:08.815000Z",
  "file_hash": "9cd8995947869adbb15f91e65cde726a5e9bd2830665079ae0c360ff692d68a5",
  "private": false,
  "record": {
    "abstract": "Extended ultraviolet (XUV) emission in nearby disk galaxies supports the inside-out growth scenario through low-efficiency star formation in their outer regions. However, such detections have largely been limited to the local Universe (z ~ 0) due to the need for deep, high-resolution UV imaging. We report the detection of a clumpy XUV disk in a massive, isolated spiral galaxy $(log(M_*/M_\\odot) \\approx 11.04)$ at z=0.67, observed with AstroSat/UVIT. The intrinsic rest frame FUV surface brightness profile, corrected for the instrument PSF, shows a more extended disk than its optical and IR counterparts. The XUV disk reaches nearly twice the optical radius and includes a large UV-bright low surface brightness (LSB) region $(S_{LSB}/S_{K80}\\approx9.3, \\mu_{FUV}-\\mu_K\\approx 1)$, consistent with the Type II XUV definition. Additionally, the detection of UV clumps without optical counterparts supports a Type I classification, suggesting gravitational instabilities and recent star formation. These features point to recent cold gas accretion onto the outer disk. From the asymmetric light profile, we estimate a gas accretion rate of $\\sim 11 M_\\odot$ $yr^{-1}$, providing evidence of active disk growth at intermediate redshift.",
    "arxiv_id": "2601.06581",
    "authors": [
      "Pushpak Pandey",
      "Kanak Saha",
      "Sanchayeeta Borthakur"
    ],
    "categories": [
      "astro-ph.GA"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "title": "AstroSat UV Deep Field IV. An Extended UV disk around a massive spiral galaxy at z=0.67",
    "url": "https://arxiv.org/abs/2601.06581",
    "version": "v1"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d81b8446-355b-4b65-a2e4-095a5b4b15af",
    "id": "arXiv Dataset",
    "type": "Model",
    "variant": "snapshot-2026-01-17",
    "version": "0.1.0"
  },
  "user_id": 1000002
}