Constraining the Accretion Geometry of the Intermediate Polar EX Hya Using NuSTAR, Swift, and Chandra Observations

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In magnetically accreting white dwarfs, the height above the white dwarf surface where the standing shock is formed is intimately related with the accretion rate and the white dwarf mass. However, it is difficult to measure. We obtained new data with NuSTAR and Swift that, together with archival Cha...

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Autores principales: Luna, G.J.M., Mukai, K., Orio, M., Zemko, P.
Formato: JOUR
Materias:
novae, cataclysmic variables
radiation mechanisms: general
X-rays: individual (EX Hydrae)
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_20418205_v852_n1_p_Luna
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_20418205_v852_n1_p_Luna
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spelling todo:paper_20418205_v852_n1_p_Luna2023-10-03T16:38:06Z Constraining the Accretion Geometry of the Intermediate Polar EX Hya Using NuSTAR, Swift, and Chandra Observations Luna, G.J.M. Mukai, K. Orio, M. Zemko, P. novae, cataclysmic variables radiation mechanisms: general X-rays: individual (EX Hydrae) In magnetically accreting white dwarfs, the height above the white dwarf surface where the standing shock is formed is intimately related with the accretion rate and the white dwarf mass. However, it is difficult to measure. We obtained new data with NuSTAR and Swift that, together with archival Chandra data, allow us to constrain the height of the shock in the intermediate polar EX Hya. We conclude that the shock has to form at least at a distance of about one white dwarf radius from the surface in order to explain the weak Fe Kα 6.4 keV line, the absence of a reflection hump in the high-energy continuum, and the energy dependence of the white dwarf spin pulsed fraction. Additionally, the NuSTAR data allowed us to measure the true, uncontaminated hard X-ray (12-40 keV) flux, whose measurement was contaminated by the nearby galaxy cluster Abell 3528 in non-imaging X-ray instruments. © 2018. The American Astronomical Society. All rights reserved.. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_20418205_v852_n1_p_Luna
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic novae, cataclysmic variables
radiation mechanisms: general
X-rays: individual (EX Hydrae)
spellingShingle novae, cataclysmic variables
radiation mechanisms: general
X-rays: individual (EX Hydrae)
Luna, G.J.M.
Mukai, K.
Orio, M.
Zemko, P.
Constraining the Accretion Geometry of the Intermediate Polar EX Hya Using NuSTAR, Swift, and Chandra Observations
topic_facet novae, cataclysmic variables
radiation mechanisms: general
X-rays: individual (EX Hydrae)
description In magnetically accreting white dwarfs, the height above the white dwarf surface where the standing shock is formed is intimately related with the accretion rate and the white dwarf mass. However, it is difficult to measure. We obtained new data with NuSTAR and Swift that, together with archival Chandra data, allow us to constrain the height of the shock in the intermediate polar EX Hya. We conclude that the shock has to form at least at a distance of about one white dwarf radius from the surface in order to explain the weak Fe Kα 6.4 keV line, the absence of a reflection hump in the high-energy continuum, and the energy dependence of the white dwarf spin pulsed fraction. Additionally, the NuSTAR data allowed us to measure the true, uncontaminated hard X-ray (12-40 keV) flux, whose measurement was contaminated by the nearby galaxy cluster Abell 3528 in non-imaging X-ray instruments. © 2018. The American Astronomical Society. All rights reserved..
format JOUR
author Luna, G.J.M.
Mukai, K.
Orio, M.
Zemko, P.
author_facet Luna, G.J.M.
Mukai, K.
Orio, M.
Zemko, P.
author_sort Luna, G.J.M.
title Constraining the Accretion Geometry of the Intermediate Polar EX Hya Using NuSTAR, Swift, and Chandra Observations
title_short Constraining the Accretion Geometry of the Intermediate Polar EX Hya Using NuSTAR, Swift, and Chandra Observations
title_full Constraining the Accretion Geometry of the Intermediate Polar EX Hya Using NuSTAR, Swift, and Chandra Observations
title_fullStr Constraining the Accretion Geometry of the Intermediate Polar EX Hya Using NuSTAR, Swift, and Chandra Observations
title_full_unstemmed Constraining the Accretion Geometry of the Intermediate Polar EX Hya Using NuSTAR, Swift, and Chandra Observations
title_sort constraining the accretion geometry of the intermediate polar ex hya using nustar, swift, and chandra observations
url http://hdl.handle.net/20.500.12110/paper_20418205_v852_n1_p_Luna
work_keys_str_mv AT lunagjm constrainingtheaccretiongeometryoftheintermediatepolarexhyausingnustarswiftandchandraobservations
AT mukaik constrainingtheaccretiongeometryoftheintermediatepolarexhyausingnustarswiftandchandraobservations
AT oriom constrainingtheaccretiongeometryoftheintermediatepolarexhyausingnustarswiftandchandraobservations
AT zemkop constrainingtheaccretiongeometryoftheintermediatepolarexhyausingnustarswiftandchandraobservations
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