{
  "abstract": "We present simultaneous XRISM, XMM-Newton, and NuSTAR observations of ESP 39607, a Seyfert 2 galaxy at z = 0.201. XRISM/Resolve reveals two absorption features near 4.7 and 4.9 keV in the observed frame, consistent with redshifted Fe xxv He α and Fe xxvi Ly α absorption from gas inflowing at v in ≃ 0.16 c . The high velocity identifies the absorber as an ultrafast inflow (UFI), which is detected at ∼3 σ –3.7 σ across different methods and continuum models. Photoionization modeling yields log ξ / erg s − 1 cm ≃ 3.7 –3.8 and a column density log N H , abs / cm − 2 ≃ 23.2 –23.8, the latter depending on the assumed metallicity. The inflow velocity and line properties are consistent with those reported from two earlier NuSTAR epochs, indicating that similar inflowing material was present over a baseline of at least 2.2 yr in the source rest frame. Across all three epochs, the combined detection significance of the UFI is 5.3 σ . Given the dynamical timescale of a few days at the inferred radius, R ≃ 49–77 R g , the multiyear evidence favors a scenario in which the inflow is continuously replenished, forming an accretion “cascade,” rather than a single long-lived cloud. With an estimated mass inflow rate of M ̇ in ≃ 0.3 –1.4 M ⊙ yr ⁻¹ , depending on metallicity, and a ratio M ̇ in / M ̇ acc ≃ 0.2 –1.0, the inflow could supply a substantial fraction of the accretion needed to power the central active galactic nucleus.",
  "abstract_shown": true,
  "affiliations": [
    "Eureka Scientific",
    "Yale University",
    "Universidad Diego Portales",
    "Space Science Institute",
    "INAF—Osservatorio Astronomico di Roma",
    "Yale Center for Astronomy & Astrophysics",
    "University of Geneva",
    "James Madison University",
    "University of Modena and Reggio Emilia",
    "California Institute of Technology",
    "INAF—Osservatorio di Astrofisica e Scienza dello Spazio di Bologna",
    "Max-Planck-Institut für Extraterrestrische Physik",
    "University of Maryland",
    "INAF—Istituto di Astrofisica e Planetologia Spaziali"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 13,
  "authors": [
    {
      "affs": [
        0,
        1,
        2
      ],
      "name": "Alessandro Peca",
      "orcid": "0000-0003-2196-3298"
    },
    {
      "affs": [
        0,
        3
      ],
      "name": "Michael J. Koss",
      "orcid": "0000-0002-7998-9581"
    },
    {
      "affs": [
        2,
        4
      ],
      "name": "Roberto Serafinelli",
      "orcid": "0000-0003-1200-5071"
    },
    {
      "affs": [
        1,
        5
      ],
      "name": "C. Megan Urry",
      "orcid": "0000-0002-0745-9792"
    },
    {
      "affs": [
        6
      ],
      "name": "Claudio Ricci",
      "orcid": "0000-0001-5231-2645"
    },
    {
      "affs": [
        7
      ],
      "name": "Keigo Fukumura",
      "orcid": "0000-0001-5709-7606"
    },
    {
      "affs": [
        8
      ],
      "name": "Massimo Gaspari",
      "orcid": "0000-0003-2754-9258"
    },
    {
      "affs": [
        9
      ],
      "name": "Elias Kammoun",
      "orcid": "0000-0002-0273-218X"
    },
    {
      "affs": [
        10
      ],
      "name": "Alessia Tortosa",
      "orcid": "0000-0003-3450-6483"
    },
    {
      "affs": [
        9
      ],
      "name": "Giulia Cerini",
      "orcid": "0000-0002-5273-4634"
    },
    {
      "affs": [
        11
      ],
      "name": "Peter G. Boorman",
      "orcid": "0000-0001-9379-4716"
    },
    {
      "affs": [
        12
      ],
      "name": "Richard Mushotzky",
      "orcid": "0000-0002-7962-5446"
    },
    {
      "affs": [
        13
      ],
      "name": "Quirino D’Amato",
      "orcid": "0000-0002-9948-0897"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7tdq0v92scw24.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/aea573",
  "fulltext_url": null,
  "id": "7tdq0v92scw24",
  "issns": [
    "0004-637X",
    "1538-4357"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea573",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3103|Astrophysical Phenomena and Observations"
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  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea573/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-21",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/7tdq0v92scw24.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:11Z",
      "native_id": "10.3847/1538-4357/aea573",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea573"
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  "subjects": [
    {
      "field": "astronomy",
      "origin": "journal-openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "Multiepoch Detection of an Ultrafast Inflow in ESP 39607: Evidence for an Accretion Cascade",
  "title_text": "Multiepoch Detection of an Ultrafast Inflow in ESP 39607: Evidence for an Accretion Cascade",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:11Z",
  "url": "https://research.draconitic.com/paper/7tdq0v92scw24",
  "venue": "The Astrophysical Journal",
  "versions": []
}