Preprint

A clean broad iron line in GS 1354--64 as seen by XRISM

H. LiuInstitut für Astronomie und Astrophysik , Universität Tübingen , Sand 1 , D-72076 Tübingen , GermanyL. KongSchool of Physics , Nankai University , Tianjin 300071 , ChinaOluwashina AdegokeCahill Center for Astronomy & Astrophysics , California Institute of Technology , Pasadena , CA 91125 , USAJiachen JiangDepartment of Physics , University of Warwick , Gibbet Hill Road , Coventry CV4 7AL , UKCosimo BambiSchool of Humanities and Natural Sciences , New Uzbekistan University , Tashkent 100001 , UzbekistanA. C. FabianInstitute of Astronomy , University of Cambridge , Madingley Road , Cambridge CB3 0HA , UKAdam IngramSchool of Mathematics, Statistics, and Physics , Newcastle University , Newcastle upon Tyne NE1 7RU , UKSwati RaviMIT Kavli Institute for Astrophysics and Space Research , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , MA 02139 , USAJames F. SteinerCenter for Astrophysics | Harvard & Smithsonian , 60 Garden Street , Cambridge , MA 02138 , USAQingcang ShuiKey Laboratory of Particle Astrophysics , Institute of High Energy Physics , Chinese Academy of Sciences , 100049 , Beijing , People's Republic of ChinaDominic J. WaltonCentre for Astrophysics Research , University of Hertfordshire , College Lane , Hatfield AL10 9AB , UKYerong XuUniversitat Politècnica de CatalunyaA. J. YoungYuexin ZhangCenter for Astrophysics | Harvard & Smithsonian , 60 Garden Street , Cambridge , MA 02138 , USAZuobin ZhangAstrophysics , Department of Physics , University of Oxford , Keble Road , Oxford OX1 3RH , UKAndrea SantangeloCenter for Astronomy and Astrophysics , Department of Physics , Fudan University , Shanghai 200438 , China

2026

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Annotatsiya

We present a spectroscopic analysis of XRISM and NuSTAR observations of the black hole X-ray binary GS~1354--64 during its 2026 outburst. A total number of 3.5 million photons are collected by the microcalorimeter Resolve on board XRISM, providing an unprecedented high-resolution view of the iron line profile. A clean broad iron line is found in the data, without significant narrow features. Modeling the broad iron line with relativistic reflection from the inner accretion disk suggests a rapidly spinning black hole (a>0.98) in the system. Measurements of the disk inclination angle from the reflection method are model-dependent. This work demonstrates the power of X-ray microcalorimeters in studying the inner accretion flow and constraining black hole parameters.

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DOI: 10.48550/arxiv.2603.06883

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