{
  "annotation_id": "e9dbbdda-390d-4e3a-bcd2-896e488777d8",
  "date_created": "2026-02-17T05:53:04.122000Z",
  "date_modified": "2026-02-17T05:53:04.122000Z",
  "file_hash": "1961b526adeb70d1d56b83042876627027a8bf8a59b987392046f63d37bf6a5c",
  "private": false,
  "record": {
    "abstract": "Rejuvenating galaxies are important probes of galaxy evolution, yet identifying them observationally is challenging as constraining recent star formation histories requires both photometric and spectroscopic data. We present a method for identifying rejuvenating galaxies in the local Universe using ultraviolet (UV) imaging and optical spectroscopy, building on a recent selection that identifies a system as rejuvenating if it is quenched in the near-UV (NUV; tracing $\\sim\\!100\\,\\mathrm{Myr}$ timescales) but star-forming in H$\\alpha$ (tracing $\\sim\\!10\\,\\mathrm{Myr}$ timescales). Shortly after a star formation episode, however, the NUV is dominated by the same massive stars that power H$\\alpha$, so these indicators do not always trace distinct timescales. To address this, we derive a relation that predicts the NUV emission associated with the ionizing O-star population traced by H$\\alpha$, enabling us to isolate the NUV contribution from longer-lived stars (primarily B/A stars with $M\\lesssim\\!20\\,M_\\odot$). Subtracting the predicted O-star NUV from the dust-corrected NUV yields a more reliable rejuvenation diagnostic. Using this method, we identify $\\sim\\!10^{4}$ rejuvenating galaxies in a sample of Sloan Digital Sky Survey (SDSS) galaxies ($\\sim\\!4.5\\%$). These galaxies have intermediate stellar masses and are found primarily in lower-density environments, becoming increasingly rare toward the centers of groups and clusters. Rejuvenating galaxies also exhibit systematically lower gas-phase metallicities, consistent with fueling by the accretion of metal-poor gas.",
    "arxiv_id": "2601.05992",
    "authors": [
      "Dylan Lazarus",
      "Laura C. Parker"
    ],
    "categories": [
      "astro-ph.GA",
      "astro-ph.IM"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "title": "An Improved UV-Optical Diagnostic for Rejuvenating Galaxies in the Local Universe and Implications for Galaxy Evolution",
    "url": "https://arxiv.org/abs/2601.05992",
    "version": "v1"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "0bbf94b2-7995-4a57-a040-04090a011fc5",
    "id": "arXiv Dataset",
    "type": "Model",
    "variant": "snapshot-2026-01-17",
    "version": "0.1.0"
  },
  "user_id": 1000002
}