{
  "abstract": "Centaurus A (NGC 5128) is the nearest radio galaxy (d = 3.8 Mpc), so individual X-ray point sources can be resolved against its giant radio lobes. We test whether a compact X-ray source population over the lobes exceeds the expected field population, once the selection function, foreground stars and the cosmic X-ray background (CXB) are accounted for. From five Chandra/ACIS-I lobe pointings we build a 0.5-7 keV catalogue of 185 sources, with Bayesian hardness ratios, Gaia DR3 and AllWISE counterparts, and spectral fits to the eight brightest. The hardness-ratio distribution (median -0.17; 80% of sources below N_H = 10^22 cm^-2) is that of background AGN plus a few foreground stars. Above the flux at which half the footprint is covered, the good sample holds 83 sources, 9 of them foreground stars, against 101 expected background sources: 27% below the expectation (-1.5 sigma including a 15% normalisation uncertainty), with no excess. The 90% upper limit on a lobe-associated excess above 6.9x10^36 erg/s is N_lobe < 18, or < 38 for a conservative 30% normalisation uncertainty. With the usual resolved-source masking and CXB subtraction, no additional lobe-associated correction to diffuse-emission or inverse-Compton measurements is indicated.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.22168",
  "author_total": 4,
  "authors": [
    {
      "name": "Karthik Balasubramaniam"
    },
    {
      "name": "Hsiang-Kuang Chang"
    },
    {
      "name": "Łukasz Stawarz"
    },
    {
      "name": "Volodymyr Marchenko"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9s9p0ad3q5wa9.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.22168",
  "fulltext_url": null,
  "id": "9s9p0ad3q5wa9",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.22168",
  "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.HE"
    ],
    [
      "openalex",
      "3103|Astrophysical Phenomena and Observations"
    ]
  ],
  "openalex": "W7222565164",
  "pdf_url": "https://arxiv.org/pdf/2610.22168",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-15",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9s9p0ad3q5wa9.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:50Z",
      "native_id": "2610.22168",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.22168"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "X-ray point sources towards the giant radio lobes of Centaurus A",
  "title_text": "X-ray point sources towards the giant radio lobes of Centaurus A",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:50Z",
  "url": "https://research.draconitic.com/paper/9s9p0ad3q5wa9",
  "venue": "arXiv",
  "versions": []
}