Escape of TeV Gamma Rays from Anisotropic Thermal Photon Fields in Active Galactic Nuclei

Details Escape of TeV Gamma Rays from Anisotropic Thermal Photon Fields in Active Galactic Nuclei Escape of TeV Gamma Rays from Anisotropic Thermal Photon Fields in Active Galactic Nuclei

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...475..534z&link_type=abstract

Astrophysical Journal v.475, p.534

Astronomy and Astrophysics

Astronomy

8

Galaxies: Active, Gamma Rays: Theory, Accretion, Accretion Disks

Scientific paper

We calculate the optical depth of TeV gamma -rays that result from the anisotropic IR--UV thermal radiation of the alpha -disk model proposed by Shakura & Sunyaev. Our calculations yield the dependences of the optical depth of high-energy gamma -rays on the disk parameters (i.e., alpha , M8, and M dot 26), photon energy, and Phi , the angle between the propagation direction and the rotation axis of the accretion disk. Our results indicate that TeV gamma -rays can escape more easily from the central engine with lower values of alpha (<~0.01) and Phi . We conclude that the optical depth of TeV gamma -rays in the anisotropic thermal radiation field places certain constraints on the possible values of the parameter alpha and the position of the emission region.

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