Publication:
Breaking the Degeneracy in Magnetic Cataclysmic Variable X-Ray Spectral Modeling Using X-Ray Light Curves

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dc.contributor.authorBelloni, Diogo
dc.contributor.authorLuna, Gerardo Juan Manuel
dc.date.accessioned2025-01-30T00:05:44Z
dc.date.available2025-01-30T00:05:44Z
dc.date.issued2022
dc.description.abstractWe present an analysis of mock X-ray spectra and light curves of magnetic cataclysmic variables using an upgraded version of the 3D cyclops code. This 3D representation of the accretion flow allows us to properly model total and partial occultation of the postshock region by the white dwarf as well as the modulation of the X-ray light curves due to the phase-dependent extinction of the preshock region. We carried out detailed postshock region modeling in a four-dimensional parameter space by varying the white dwarf mass and magnetic field strength as well as the magnetosphere radius and the specific accretion rate. To calculate the postshock region temperature and density profiles, we assumed equipartition between ions and electrons; took into account the white dwarf gravitational potential, the finite size of the magnetosphere, and a dipole-like magnetic field geometry; and considered cooling by both bremsstrahlung and cyclotron radiative processes. By investigating the impact of the parameters on the resulting X-ray continuum spectra, we show that there is an inevitable degeneracy in the four-dimensional parameter space investigated here, which compromises X-ray continuum spectral fitting strategies and can lead to incorrect parameter estimates. However, the inclusion of X-ray light curves in different energy ranges can break this degeneracy, and it therefore remains, in principle, possible to use X-ray data to derive fundamental parameters of magnetic cataclysmic variables, which represents an essential step toward understanding their formation and evolution.
dc.description.filiationFil: Belloni, Diogo. Universidad Técnica Federico Santa María; Chile
dc.description.filiationFil: Rodrigues, Claudia V. Instituto Nacional de Pesquizas Espaciais; Brasil
dc.description.filiationFil: Schreiber, Matthias R.. Universidad Técnica Federico Santa María; Chile
dc.description.filiationFil: Castro, Manuel. Instituto Nacional de Pesquizas Espaciais; Brasil
dc.description.filiationFil: Costa, Joaquim E. R.. Instituto Nacional de Pesquizas Espaciais; Brasil
dc.description.filiationFil: Hayashi, Katsuhiro. National Aeronautics and Space Administration; Estados Unidos
dc.description.filiationFil: Lima, Isabel J.. Instituto Nacional de Pesquizas Espaciais; Brasil
dc.description.filiationFil: Martins, Murilo. Universidade Estadual da Paraiba; Brasil
dc.description.filiationFil: Oliveira, Alexandre S.. Universidade Estadual da Paraiba; Brasil
dc.description.filiationFil: Parsons, Steven G.. University of Sheffield; Reino Unido
dc.format.mimetypeapplication/pdf
dc.identifier.citationBelloni, Diogo; Rodrigues, Claudia V.; Schreiber, Matthias R.; Castro, Manuel; Costa, Joaquim E. R.; et al. (2021) Breaking the Degeneracy in Magnetic Cataclysmic Variable X-Ray Spectral Modeling Using X-Ray Light Curves. Astrophysical Journal Supplement Series; 256 (2), 1-42
dc.identifier.doihttp://dx.doi.org/10.3847/1538-4365/ac141c
dc.identifier.issn0067-0049
dc.identifier.urihttps://iopscience.iop.org/article/10.3847/1538-4365/ac141c
dc.identifier.urihttps://repositorio.unahur.edu.ar/handle/123456789/517
dc.journal.number2
dc.journal.pagination1-42
dc.journal.titleAstrophysical Journal, Supplement Series
dc.journal.volume256
dc.language.isoeng
dc.publisherIOP Publishing
dc.rights.licenseinfo:eu-repo/semantics/restrictedAccess
dc.subject.ocde1Ciencias Exactas y Naturales
dc.subject.ocde2Ciencias Físicas
dc.subject.unahurCiencias Básicas y Aplicadas
dc.titleBreaking the Degeneracy in Magnetic Cataclysmic Variable X-Ray Spectral Modeling Using X-Ray Light Curves
dc.typeinfo:eu-repo/semantics/article
dc.type.oaireinfo:eu-repo/semantics/article
dc.type.snrdinfo:ar-repo/semantics/artículo
dc.type.versioninfo:eu-repo/semantics/draftVersion
dspace.entity.typePublication
relation.isAuthorOfPublication780246c8-d7fb-43ba-b6f5-1ef1f4e7f242
relation.isAuthorOfPublication.latestForDiscovery780246c8-d7fb-43ba-b6f5-1ef1f4e7f242
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