Modeling the precession of the warped inner accretion disk in the pulsars LMC X-4 and SMC X-1 with NuSTAR and XMM-Newton

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dc.contributor.authorBrumback, McKinley C.
dc.contributor.authorHickox, Ryan C.
dc.contributor.authorFurst, Felix S.
dc.contributor.authorPottschmidt, Katja
dc.contributor.authorTomsick, John A.
dc.contributor.authorWilms, Jorn
dc.date.accessioned2019-11-13T17:23:50Z
dc.date.available2019-11-13T17:23:50Z
dc.date.issued2019-09-23
dc.description.abstractWe present a broad-band X-ray study of the effect of superorbital periods on X-ray spectra and pulse profiles in the neutron star X-ray binaries LMC X-4 and SMC X-1. These two sources display periodic or quasi-periodic variations in luminosity on the order of tens of days which are known to be superorbital, and are attributed to warped, precessing accretion disks. Using joint NuSTAR and XMM-Newton observations that span a complete superorbital cycle, we examine the broad-band spectra of these sources and find the shape to be well described by an absorbed power law with a soft blackbody component. Changes in spectral shape and pulse profile shape are periodic with superorbital period, as expected from a precessing disk. We perform X-ray tomography using the changes in pulse profiles to model the geometry and kinematics of the inner accretion disk. Our simple beam and inner disk geometric model indicates that the long term changes in soft pulse shape and phase are consistent with reprocessed emission from a precessing inner disk.en_US
dc.description.urihttps://arxiv.org/abs/1909.10559en_US
dc.format.extent16 pagesen_US
dc.genrejournal articles preprintsen_US
dc.identifierdoi:10.13016/m2vfyh-0g07
dc.identifier.citationMcKinley C. Brumback and Ryan C. Hickox and Felix S. Fürst and Katja Pottschmidt and John A. Tomsick and Jörn Wilms,Modeling the precession of the warped inner accretion disk in the pulsars LMC X-4 and SMC X-1 with NuSTAR and XMM-Newton, 2019, https://arxiv.org/abs/1909.10559en_US
dc.identifier.urihttp://hdl.handle.net/11603/16280
dc.language.isoen_USen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Space Sciences and Technology
dc.relation.ispartofUMBC Faculty Collection
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.
dc.subjectbroad-band X-ray studyen_US
dc.subjectsuperorbital periodsen_US
dc.subjectwarped inner accretion disken_US
dc.subjectpulsarsen_US
dc.subjectNuSTAR and XMM-Newtonen_US
dc.titleModeling the precession of the warped inner accretion disk in the pulsars LMC X-4 and SMC X-1 with NuSTAR and XMM-Newtonen_US
dc.typeTexten_US

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