{
  "abstract": "GRS 1915+105 is one of the most studied black-hole X-ray binaries, known for its extreme variability and rich phenomenology. Previous studies of this source using the Rossi X-ray Timing Explorer reported a transition in the phase lags of type-C quasi-periodic oscillations (QPOs): from soft (where low-energy photons lag the high-energy ones) at QPO frequencies above ∼2 Hz to hard at frequencies below ∼2 Hz. The hard lags of the QPO coincide with episodes of strong radio emission. We analysed NICER observations of GRS 1915+105 obtained between 2018 and 2020, during a period in which the source flux decreased steadily, and performed a detailed spectral-timing study of the detected type-C QPOs. We identify a type-C QPO with frequencies ranging from ∼1.3 − 3.9 Hz that displays soft lags and, contrary to the RXTE observations, shows no evidence of hard phase lags at frequencies below 2 Hz. Quasi-simultaneous AMI-LA radio observations show consistently low radio flux (≲5 mJy) during this period. These results suggest that the hard QPO lags in GRS 1915+105 are linked to the presence of strong radio activity, implying that the relativistic jet may be responsible for the hard phase lags. This supports a scenario in which QPO phase lags trace changes in coronal geometry and accretion–ejection coupling in GRS 1915+105.",
  "abstract_shown": true,
  "affiliations": [
    "Instituto Argentino de Radioastronomía (CCT La Plata, CONICET; CICPBA; UNLP), C.C.5",
    "Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata",
    "Kapteyn Astronomical Institute, University of Groningen",
    "Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Brera",
    "Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences",
    "Astrophysics, Department of Physics, University of Oxford"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 8,
  "authors": [
    {
      "affs": [
        0,
        1,
        2
      ],
      "name": "Candela Bellavita",
      "orcid": "0009-0001-7084-3244"
    },
    {
      "affs": [
        2
      ],
      "name": "Mariano Méndez",
      "orcid": "0000-0003-2187-2708"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Federico García",
      "orcid": "0000-0001-9072-4069"
    },
    {
      "affs": [
        3
      ],
      "name": "Sara Motta"
    },
    {
      "affs": [
        2
      ],
      "name": "Pengcheng Yang",
      "orcid": "0000-0002-0841-0712"
    },
    {
      "affs": [
        2
      ],
      "name": "Wyncko Tonckens",
      "orcid": "0009-0008-6459-9514"
    },
    {
      "affs": [
        4
      ],
      "name": "Liang Zhang",
      "orcid": "0000-0003-4498-9925"
    },
    {
      "affs": [
        5
      ],
      "name": "Rob Fender"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/aq1y0p5xvaa42.bib",
  "cited_by": 0,
  "doi": "10.1051/0004-6361/202661476",
  "fulltext_url": null,
  "id": "aq1y0p5xvaa42",
  "issns": [
    "0004-6361",
    "1432-0746"
  ],
  "landing_url": "https://www.aanda.org/10.1051/0004-6361/202661476",
  "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"
    ]
  ],
  "openalex": "W7213372373",
  "pdf_url": null,
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-28",
  "publisher": "EDP Sciences",
  "ris": "https://research.draconitic.com/paper/aq1y0p5xvaa42.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:18Z",
      "native_id": "10.1051/0004-6361/202661476",
      "source": "crossref",
      "url": "https://www.aanda.org/10.1051/0004-6361/202661476"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "journal-openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "Compelling evidence of a link between the lags of the quasi-periodic oscillations and the radio jet in the black-hole X-ray binary GRS 1915+105",
  "title_text": "Compelling evidence of a link between the lags of the quasi-periodic oscillations and the radio jet in the black-hole X-ray binary GRS 1915+105",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:18Z",
  "url": "https://research.draconitic.com/paper/aq1y0p5xvaa42",
  "venue": "Astronomy & Astrophysics",
  "versions": []
}