Developing the Physical Understanding of Intermediate Polars: An X-Ray Study of TV Col and V2731 Oph

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dc.contributor.authorOliveira, R. Lopes de
dc.contributor.authorMukai, K.
dc.date.accessioned2019-10-31T17:16:47Z
dc.date.available2019-10-31T17:16:47Z
dc.date.issued2019-08-02
dc.description.abstractThe X-rays in intermediate polars (IPs) originate in a compact region near the surface of a magnetic white dwarf (WD) and interact with the complex environment surrounding the emission region. Here we report a case study of two IPs, TV Col and V2731 Oph, with selected archival X-ray observations (NuSTAR, Swift, Suzaku, and XMMNewton). For TV Col, we were successful in simultaneously accounting for the primary X-rays, the secondary X-rays due to Compton scattering and fluorescence, and the effects of local absorbers. In this case, we were able to demonstrate that the shock height is small, based on the high reflection amplitude; hence, the maximum temperature of the post-shock region can be used to derive the WD mass of 0.735 ± 0.015 Me. Despite the high specific accretion rate required to explain the small shock height, we do not detect any spin modulation in our NuSTAR data, consistent with the modest amount of complex absorption seen spectroscopically. We argue that our results are robust because they are based on the joint temporal–spectral analysis of broadband X-ray data. The spectrum of V2731 Oph is more highly absorbed. Through our analysis of the Suzaku data, we present a spectral model with nitrogen overabundance without the previously claimed soft blackbody that should be further explored. We have been unable to constrain the reflection amplitude for V2731 Oph; this and the detection of spin modulation above 10 keV suggest that it may have a tall shock. Hence, we only derive a lower limit to the mass of its WD (>0.9 Me).en_US
dc.description.sponsorshipWe thank the anonymous referee for numerous helpful suggestions. R.L.O. was partially supported by the Brazilian agency CNPq (Universal grants 459553/2014-3, PQ 302037/ 2015-2, and PDE 200289/2017-9). This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC; https://www. cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This research has made use of the NuSTAR Data Analysis Software (NuSTARDAS), jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (Caltech, USA). This research has made use of the XRT Data Analysis Software (XRTDAS) developed under the responsibility of the ASI Science Data Center (ASDC), Italy.en_US
dc.description.urihttps://iopscience.iop.org/article/10.3847/1538-4357/ab2b41en_US
dc.format.extent14 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2euse-i5ld
dc.identifier.citationOliveira, R. Lopes de; Mukai, K.; Developing the Physical Understanding of Intermediate Polars: An X-Ray Study of TV Col and V2731 Oph; The Astrophysical Journal 880,2; https://doi.org/10.3847/1538-4357/ab2b41en_US
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ab2b41
dc.identifier.urihttp://hdl.handle.net/11603/16015
dc.language.isoen_USen_US
dc.publisherIOP Publishingen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Space Sciences and Technology
dc.relation.ispartofUMBC Goddard Planetary Heliophysics Institute (GPHI)
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.rights@2019 IOP
dc.subjectnovaeen_US
dc.subjectcataclysmic variablesen_US
dc.subjectstarsen_US
dc.subjectindividual (TV Col, V2731 Oph)en_US
dc.subjectultravioleten_US
dc.subjectX-raysen_US
dc.subjectbinariesen_US
dc.titleDeveloping the Physical Understanding of Intermediate Polars: An X-Ray Study of TV Col and V2731 Ophen_US
dc.typeTexten_US

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