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.authorFürst, Felix S.
dc.contributor.authorPottschmidt, Katja
dc.contributor.authorTomsick, John A.
dc.contributor.authorWilms, Jörn
dc.date.accessioned2022-08-15T21:01:22Z
dc.date.available2022-08-15T21:01:22Z
dc.date.issued2020-01-16
dc.description.abstractWe present a broadband 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 quasiperiodic variations in luminosity of 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 broadband 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 geometric model of a beam and inner disk 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.sponsorshipWe would like to thank the anonymous referee for their comments, which improved the manuscript. We would like to thank the NuSTAR Galactic Binaries Science Team and G. Vasilopoulos for comments and contributions. M.C.B. acknowledges support from NASA grant Nos. NNX15AV32G and NNX15AH79H. This research made use of NuSTARDAS, developed by ASDC (Italy) and Caltech (USA), XMMSAS developed by ESA, ISIS functions (ISISscripts) provided by ECAP/Remeis observatory and MIT (http://www.sternwarte.uni-erlangen.de/isis/), and the MAXI data provided by RIKEN, JAXA, and the MAXI team.en_US
dc.description.urihttps://iopscience.iop.org/article/10.3847/1538-4357/ab5b04en_US
dc.format.extent15 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2eoka-4qfn
dc.identifier.citationBrumback, M. C., Hickox, R. C., Fürst, F. S., Pottschmidt, K., Tomsick, J. A., and Wilms, J., “Modeling the Precession of the Warped Inner Accretion Disk in the Pulsars LMC X-4 and SMC X-1 with NuSTAR and XMM-Newton”, The Astrophysical Journal, vol. 888, no. 2, 2020. doi:10.3847/1538-4357/ab5b04.en_US
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ab5b04
dc.identifier.urihttp://hdl.handle.net/11603/25416
dc.language.isoen_USen_US
dc.publisherAASen_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.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.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
dcterms.creatorhttps://orcid.org/0000-0002-4656-6881en_US

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