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An Accretion-Ejection Instability in magnetized disks

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arxiv astro-ph/9907267 v1 pith:BLFXLARJ submitted 1999-07-20 astro-ph

classification astro-ph
keywords instabilityangulardiskdisksgalacticmagneticmomentumspiral
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We present an instability occurring in the inner part of disks threaded by a moderately strong vertical (poloidal) magnetic field. Its mechanism is such that a spiral density wave in the disk, driven by magnetic stresses (rather than self-gravity as in galactic spirals), becomes unstable by exchanging angular momentum with a Rossby vortex it generates at its corotation radius. This angular momentum can then ``leak'' as Alfven waves emitted toward the corona of the disk thus providing, as an element of the accretion process, an energetic source for a wind or a jet. As galactic spirals, this instability forms low azimuthal wavenumber, standing spiral patterns which might provide an explanation for low-frequency QPOs in low-mass X-ray binaries.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 47 citations worldwide. Full citation record

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    astro-ph.HE 2026-05 unverdicted novelty 7.0 of 10

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    astro-ph.HE 2025-07 conditional novelty 6.0 of 10

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  4. Probing the Strong Gravity Region of Black Holes with eXTP

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    eXTP's large collecting area and combined spectral, timing, and polarimetric instruments are simulated to improve black hole spin and mass measurements and to tighten tests of the Kerr metric.

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    A recurring 0.03 Hz radio QPO was detected in the 2025 flare of GRS 1915+105 at >5.9 sigma in one epoch, identical across S- and X-bands and prior years, indicating an intrinsic accretion-jet timescale.

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