{
  "abstract": "The SMMAN project has carried out nine years of radio flux monitoring in the C and K bands of the blazar 4C+72.28. The two bands show markedly different secular evolution, with a substantially stronger K-band decline producing a gradual decrease in the C-K spectral index. After accounting for this secular evolution, multiple timing diagnostics reveal a candidate quasi-periodic modulation with a characteristic timescale of $\\sim1000$ d, most clearly in the C band. The C-band GLSP peak reaches a local significance of $3.29σ$, while its global significance remains modest at $\\sim2σ$ and the monitoring baseline covers only about three cycles. Independent and joint MCMC fits support a phenomenological decomposition for both bands into a long-term linear trend and a recurrent component. Under the shared-period assumption, the joint fit returns a characteristic timescale of approximately 1027 d and a similar fractional recurrent amplitudes of $\\simeq5.45\\%$. Information-criterion comparisons favor the combined linear-plus-sinusoidal model in both bands. Cross-correlation analysis shows a nominal K-leading offset in the original light curves but a centroid consistent with zero lag after detrending, although the lag distributions overlap substantially. These results are consistent with a common recurrent modulation superposed on slower frequency-dependent jet evolution. Geometrical Doppler-factor modulation provides one plausible interpretation, although intrinsic and opacity-related processes cannot be excluded.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.32168",
  "author_total": 9,
  "authors": [
    {
      "name": "Xin Wang"
    },
    {
      "name": "Timur Mufakharov"
    },
    {
      "name": "Guiping Tan"
    },
    {
      "name": "Zhenhua Han"
    },
    {
      "name": "Ning Chang"
    },
    {
      "name": "Qi Yuan"
    },
    {
      "name": "Yunzhuo Wang"
    },
    {
      "name": "Xiang Liu"
    },
    {
      "name": "Lang Cui"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/23zshyyns5q2r.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.32168",
  "fulltext_url": null,
  "id": "23zshyyns5q2r",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.32168",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "openalex",
      "3106|Astrophysics and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7223682125",
  "pdf_url": "https://arxiv.org/pdf/2610.32168",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-23",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/23zshyyns5q2r.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:15Z",
      "native_id": "2610.32168",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.32168"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "SMMAN Studies of AGN Variability. I. Long-term Spectral Evolution and a Candidate $\\sim1000$-day Quasi-periodic Modulation in 4C+72.28",
  "title_text": "SMMAN Studies of AGN Variability. I. Long-term Spectral Evolution and a Candidate ∼1000-day Quasi-periodic Modulation in 4C+72.28",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:15Z",
  "url": "https://research.draconitic.com/paper/23zshyyns5q2r",
  "venue": "arXiv",
  "versions": []
}