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Astron. Astrophys. 356, 373-376 (2000)

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Effect of beam-plasma instabilities on accretion disk flares

V. Krishan 1, P.J. Wiita 2 and S. Ramadurai 3

1 Indian Institute of Astrophysics, Koramangala, Bangalore 560034, India (vinod@iiap.ernet.in)
2 Georgia State University, Department of Physics and Astronomy, Atlanta, GA 30303, USA (wiita@chara.gsu.edu)
3 Tata Institute of Fundamental Research, Theoretical Astrophysics Group, Homi Bhabha Marg, Mumbai 400005, India (durai@tifr.res.in)

Received 26 July 1999 / Accepted 4 February 2000

Abstract

We show that a certain class of flare models for variability from accretion disk coronae are subject to beam-plasma instabilities. These instabilities can prevent significant direct acceleration and greatly reduce the variable X-ray emission argued to arise via inverse Compton scattering involving relativistic electrons in beams and soft photons from the disk.

Key words: accretion, accretion disks – plasmas – Sun: flares – galaxies: active – X-rays: general

Send offprint requests to: Vinod Krishan

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© European Southern Observatory (ESO) 2000

Online publication: March 28, 2000
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