Evolution of QPOs in GX 339–4 and EXO 1846–031 with Insight-HXMT and NICER
Zuobin ZhangCenter for Astronomy and Astrophysics, Center for Field Theory and Particle Physics, and Department of Physics, Fudan University, Shanghai 200438, ChinaH. LiuCenter for Astronomy and Astrophysics, Center for Field Theory and Particle Physics, and Department of Physics, Fudan University, Shanghai 200438, ChinaDivya RawatObservatoire Astronomique de Strasbourg, Université de Strasbourg, CNRS, F-67000 Strasbourg, FranceCosimo BambiSchool of Natural Sciences and Humanities, New Uzbekistan University, Tashkent 100007, UzbekistanRanjeev MisraInter-University Center for Astronomy and Astrophysics, Ganeshkhind, Pune 411007, IndiaPengju WangUniversity of Chinese Academy of SciencesLong JiSchool of Physics and Astronomy, Sun Yat-Sen University, Zhuhai 519082, ChinaShuang‐Nan ZhangKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
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Abstract We conduct a spectral and timing analysis of GX 339−4 and EXO 1846−031 with the aim of studying the evolution of type-C quasiperiodic oscillations (QPOs) with spectral parameters. The high-cadence data from Insight-HXMT and NICER allow us to track the evolution of QPOs and spectra simultaneously. Type-C QPOs appear at the end of the low–hard state and/or the hard–intermediate state. Our results reveal that the QPO frequency is closely related to the inner disk radius and mass accretion rate in the two sources. This correlation aligns well with the dynamic frequency model of a truncated disk.
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