{
  "abstract": "Relic galaxies are the descendants of high-redshift compact quiescent systems. We present the first spatially resolved spectroscopic study of J1447-0149, a massive relic at $z=0.21$, observed with MUSE+AO. We characterize its kinematics and stellar population properties to probe its spatially resolved mass assembly history. We measured stellar kinematics with sub-kpc bin sizes, covering $\\sim 1.4$ effective radii. We then used a coarser three-bin configuration informed by the kinematics to recover the higher-order velocity moments, $[α/{\\rm Fe}]$, stellar age and metallicity. We reconstructed the star formation history and computed the degree of relicness (DoR). MUSE data reveal a velocity gradient, showing that J1447-0149 is not purely pressure supported. The velocity-dispersion field displays a central peak, reaching $σ_\\star=233\\pm13\\,{\\rm km\\,s^{-1}}$, substantially larger than previous seeing-limited measurements ($σ_{\\star} =187 \\pm 9\\,{\\rm km\\,s^{-1}}$). The $h_3$--$V_\\star$ anti-correlation and mildly positive $h_4$ values support a composite structure, with a rotating stellar component surrounding a compact dynamically hot core. This central, dispersion-dominated region is also the oldest and most metal-rich component. Its SFH rises rapidly, with the stellar mass assembled within $\\sim2\\,{\\rm Gyr}$ after the Big Bang, and reaches ${\\rm DoR}=0.9^{+0.1}_{-0.2}$. The two outer bins have a DoR value of ${\\rm DoR}=0.8\\pm0.2$, consistent with the central bin, but possibly indicating slightly longer formation times. Spatially resolved spectroscopy has been crucial to confirm the relic nature of J1447-0149, linking resolved morphology, kinematics, and stellar populations to constrain the early assembly of its central spheroid and surrounding disk.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.21658",
  "author_total": 16,
  "authors": [
    {
      "name": "Johanna Hartke"
    },
    {
      "name": "Chiara Spiniello"
    },
    {
      "name": "Michele Cappellari"
    },
    {
      "name": "Davide Bevacqua"
    },
    {
      "name": "Enrico Congiu"
    },
    {
      "name": "Anna Ferré-Mateu"
    },
    {
      "name": "Adriano Poci"
    },
    {
      "name": "Claudia Pulsoni"
    },
    {
      "name": "Magda Arnaboldi"
    },
    {
      "name": "Giuseppe D'Ago"
    },
    {
      "name": "Michalina Maksymowicz-Maciata"
    },
    {
      "name": "Paolo Saracco"
    },
    {
      "name": "Diana Scognamiglio"
    },
    {
      "name": "David A. Simon"
    },
    {
      "name": "Crescenzo Tortora"
    },
    {
      "name": "Petri Väisänen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bb2q1sb59wf5r.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.21658",
  "fulltext_url": null,
  "id": "bb2q1sb59wf5r",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.21658",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7213914061",
  "pdf_url": "https://arxiv.org/pdf/2609.21658",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bb2q1sb59wf5r.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:03Z",
      "native_id": "2609.21658",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.21658"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "KiDS J1447-0149: The first spatially resolved spectroscopy of a relic galaxy beyond the local universe. An old high-dispersion core embedded in a compact rotating stellar structure",
  "title_text": "KiDS J1447-0149: The first spatially resolved spectroscopy of a relic galaxy beyond the local universe. An old high-dispersion core embedded in a compact rotating stellar structure",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:03Z",
  "url": "https://research.draconitic.com/paper/bb2q1sb59wf5r",
  "venue": "arXiv",
  "versions": []
}