Abundance enhancements in black-hole accretion: application to γ-ray line observations of the Orion complex.

Details Abundance enhancements in black-hole accretion: application to γ-ray line observations of the Orion complex. Abundance enhancements in black-hole accretion: application to γ-ray line observations of the Orion complex.

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...298l..13m&link_type=abstract

Astronomy and Astrophysics, v.298, p.L13

Physics

12

Gamma Rays: Lines, Black Hole Physics

Scientific paper

We show that stochastic acceleration of a Solar composition plasma in the accretion disk of a black hole can lead to enhancements of energetic C and O relative to H and He. The mechanism whereby this occurs is gyroresonance with cascading Alfven wave turbulence, which preferentially accelerates ions with a low charge to mass (Q/A) ratio. For reasonable conditions found near Solar mass black holes, this can produce enhanced energetic C and O abundances, in accordance with COMPTEL observations of nuclear deexcitation line signatures from the direction of the Orion complex. We predict time-variable line signatures due to variations in the accretion rate, along with a radiation pattern consistent with a point source.

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