Monitoring the short-term variability of Cyg X-1: Spectra and timing

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dc.contributor.authorPottschmidt, Katja
dc.contributor.authorWilms, J.
dc.contributor.authorStaubert, R.
dc.contributor.authorNowak, M. A.
dc.contributor.authorDove, J. B.
dc.contributor.authorHeindl, W. A.
dc.contributor.authorSmith, D. M.
dc.date.accessioned2023-10-12T21:52:24Z
dc.date.available2023-10-12T21:52:24Z
dc.date.issued2000-04-12
dc.descriptionTHE FIFTH COMPTON SYMPOSIUM, 15-17 Sep 1999, Portsmouth, New Hampshire (USA)en_US
dc.description.abstractWe present first results from the spectral and temporal analysis of an RXTE monitoring campaign of the black hole candidate Cygnus X-1 in 1999. The timing properties of this hard state black hole show considerable variability, even though the state does not change. This has previously been noted for the power spectral density, but is probably even more pronounced for the time lags. From an analysis of four monitoring observations of Cyg X-1, separated by 2 weeks from each other, we find that a shortening of the time lags is associated with a hardening of the X-ray spectrum, as well as with a longer characteristic “shot time scale.” We briefly discuss possible physical/geometrical reasons for this variability of the hard state properties.en_US
dc.description.sponsorshipWe thank all participants in the 1999 broad band campaign for their continued effort to obtain simultaneous radio through X-ray observations of Cygnus X-1. This work has been partially financed by DFG grant Sta 173/22 and a travel grant by the Deutsche Forschungsgemeinschaft to JW.en_US
dc.description.urihttps://pubs.aip.org/aip/acp/article-abstract/510/1/109/559148/Monitoring-the-short-term-variability-of-Cyg-X-1en_US
dc.format.extent5 pagesen_US
dc.genreconference papers and proceedingsen_US
dc.genrepreprintsen_US
dc.identifierdoi:10.13016/m2funt-jlka
dc.identifier.citationK. Pottschmidt, J. Wilms, R. Staubert, M. A. Nowak, J. B. Dove, W. A. Heindl, D. M. Smith; Monitoring the short-term variability of Cyg X-1: Spectra and timing. AIP Conf. Proc. 12 April 2000; 510 (1): 109–113. https://doi.org/10.1063/1.1303184en_US
dc.identifier.urihttps://doi.org/10.1063/1.1303184
dc.identifier.urihttp://hdl.handle.net/11603/30136
dc.language.isoen_USen_US
dc.publisherAIPen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Space Sciences and Technology
dc.relation.ispartofUMBC Physics Department
dc.rightsThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in K. Pottschmidt, J. Wilms, R. Staubert, M. A. Nowak, J. B. Dove, W. A. Heindl, D. M. Smith; Monitoring the short-term variability of Cyg X-1: Spectra and timing. AIP Conf. Proc. 12 April 2000; 510 (1): 109–113. https://doi.org/10.1063/1.1303184 and may be found at https://pubs.aip.org/aip/acp/article-abstract/510/1/109/559148/Monitoring-the-short-term-variability-of-Cyg-X-1.en_US
dc.titleMonitoring the short-term variability of Cyg X-1: Spectra and timingen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-4656-6881en_US

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