The spectral-timing analysis of Cygnus X-1 with Insight-HXMT

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dc.contributor.authorZhou, M.
dc.contributor.authorGrinberg, V.
dc.contributor.authorBu, Q.-C.
dc.contributor.authorSantangelo, A.
dc.contributor.authorCangemi, F.
dc.contributor.authorDiez, C. M.
dc.contributor.authorKönig, O.
dc.contributor.authorJi, L.
dc.contributor.authorNowak, M. A.
dc.contributor.authorPottschmidt, Katja
dc.contributor.authorRodriguez, J.
dc.contributor.authorWilms, J.
dc.contributor.authorZhang, S.
dc.contributor.authorQu, J.-L.
dc.contributor.authorZhang, S.-N.
dc.date.accessioned2022-10-11T16:42:38Z
dc.date.available2022-10-11T16:42:38Z
dc.date.issued2022-10-21
dc.description.abstractCygnus X-1, as the first discovered black hole binary, is a key source for understanding the mechanisms of state transitions and the scenarios of accretion in extreme gravity fields. We present a spectral-timing analysis of observations taken with the Insight–Hard X-ray Modulation Telescope (HXMT) mission, focusing on the spectral-state-dependent timing properties in the broad energy range of 1−150 keV, thus extending previous studies based on Rossi X-ray Timing Explorer (RXTE) to both lower and higher energies. Our main results are the following: (a) We successfully use a simple empirical model to fit all spectra, confirming that the reflection component is stronger in the soft state than in the hard state. (b) The evolution of the total fractional root mean square (rms) depends on the selected energy band and the spectral shape, which is a direct result of the evolution of the power spectral densities (PSDs). (c) In the hard/intermediate state, we see clear short-term variability features and a positive correlation between the central frequencies of the variability components and the soft photon index Γ1, which we also see at energies above 15 keV. In the soft state, the power spectrum is instead dominated by red noise. These behaviors can be traced to at least 90 keV. (d) Finally, the coherence and the phase-lag spectra show different behaviors, depending on the different spectral shapes.en_US
dc.description.sponsorshipM.Z. would like to thank the support from China Scholarship Council (CSC 202006100027). This research has made use of NASA’s Astrophysics Data System Bibliographic Services. This research also made use of ISIS functions (http://www.sternwarte.uni-erlangen.de/isis/) provided by ECAP/Remeis observatory and MIT. This work made use of data from the Insight-HXMT mission, a project funded by China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). J.R. acknowledges partial funding from the French space agency (CNES), and the French programme national des hautes énergies. Z.S. is supported by the National Key R&D Program of China (2021YFA0718500), the National Natural Science Foundation of China under grants U1838201, U1838202. The material is based upon work supported by NASA under award number 80GSFC21M0002 (CRESST II).en_US
dc.description.urihttps://www.aanda.org/articles/aa/full_html/2022/10/aa44240-22/aa44240-22.htmlen_US
dc.format.extent17 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2weed-tdhm
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202244240
dc.identifier.urihttp://hdl.handle.net/11603/26150
dc.language.isoen_USen_US
dc.publisherEDP Sciences
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Space Sciences and Technology
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Physics Department
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.en_US
dc.rightsAttribution 4.0 International (CC BY 4.0)
dc.rightshttps://creativecommons.org/licenses/by/4.0/
dc.titleThe spectral-timing analysis of Cygnus X-1 with Insight-HXMTen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-4656-6881en_US

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