On how much X-ray and UV radiation processes are coupled in accretion disks: AGN case

Details On how much X-ray and UV radiation processes are coupled in accretion disks: AGN case On how much X-ray and UV radiation processes are coupled in accretion disks: AGN case

2005-07-06

arxiv.org/abs/astro-ph/0507152v1

Astrophys.J.630:L9-L12,2005

Astronomy and Astrophysics

Astrophysics

to appear in ApJ Letters

Scientific paper

10.1086/462417

Within the standard accretion disk theory for active galactic nuclei (AGN), the observed X-rays are often modeled by Compton up-scattering of ultraviolet (UV) disk photons inside a hot disk corona. Here, we point out that for many AGN, radiation pressure due to the very same UV disk photons can drive a flow from the disk into the corona and couple the processes producing X-rays and UV photons. This coupling could lead to quenching of the disk corona because the regions above the UV disk will be too dense, too opaque, and consequently too cold. We discuss various consequences of this new type of the X-ray/UV coupling on the dynamical and radiative properties of AGN.

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