The 150D modulation of the X-ray emission of CYG X-1

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dc.contributor.authorÖzdemir, S
dc.contributor.authorDemircan, O
dc.date.accessioned2025-01-27T20:49:30Z
dc.date.available2025-01-27T20:49:30Z
dc.date.issued2001
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractThe X-ray observations of Cyg X-1, covering a period of 3.8 years, by the All Sky Monitor (ASM) on board the Rossi X-ray Timing Explorer (RXTE) were analysed to search for long periodicities. The periodicities in the original data were seen to be distorted by the high/soft state and the failed state counts of the system, and thus the power spectra showed two unrealistic peaks at 1608 and 406 days. The similar to 300 day modulation reported previously (e.g. Priedhorsky et al. 1983) is not confirmed by the present ASM data. Truncation of the high counts above 30 cnts/s partly eliminates the distortion and reveals the true period of 150(d) in the power spectra. It is interesting that the high/soft state (HS) and the failed state transitions (FST) always occur on the maximum phase of the 150(d) cycle.
dc.identifier.endpage325
dc.identifier.issn0004-640X
dc.identifier.issue3
dc.identifier.scopus2-s2.0-0035641285
dc.identifier.scopusqualityQ2
dc.identifier.startpage319
dc.identifier.urihttps://hdl.handle.net/20.500.12428/25196
dc.identifier.volume278
dc.identifier.wosWOS:000172587600006
dc.identifier.wosqualityQ4
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherKluwer Academic Publ
dc.relation.ispartofAstrophysics and Space Science
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectOrbital Modulation
dc.subjectVariability
dc.subjectPeriod
dc.titleThe 150D modulation of the X-ray emission of CYG X-1
dc.typeArticle

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