Journal Article

X-rays and γ-rays from cataclysmic variables: the example case of intermediate polar V1223 Sgr

W. Bednarek and J. Pabich

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 411, issue 3, pages 1701-1706
Published in print March 2011 | ISSN: 0035-8711
Published online February 2011 | e-ISSN: 1365-2966 | DOI:
X-rays and γ-rays from cataclysmic variables: the example case of intermediate polar V1223 Sgr

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The accretion of matter on to intermediate polar white dwarfs (IPWDs) seems to provide attractive conditions for acceleration of particles to high energies in a strongly magnetized turbulent region at the accretion disc inner radius. We consider possible acceleration of electrons and hadrons in such region and investigate their high-energy radiation processes. It is concluded that accelerated electrons lose energy mainly on synchrotron process producing non-thermal X-ray emission. On the other hand, accelerated hadrons are convected on to the white dwarf (WD) surface and interact with dense matter. As a result, high-energy γ-rays from decay of neutral pions and secondary leptons from decay of charged pions appear. We show that GeV–TeV γ-rays can escape from the vicinity of the WD. Secondary leptons produce synchrotron radiation in the hard X-rays and soft γ-rays. As an example, we predict the X-ray and γ-ray emission from IPWD V1223 Sgr. Depending on the spectral index of injected particles, this high-energy emission may be detected by the Fermi Large Array Telescope and/or the future Cherenkov Telescope Array observatory.

Keywords: radiation mechanisms: non-thermal; binaries: close; white dwarfs; gamma-rays: stars

Journal Article.  5098 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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