How Much X-Ray and UV Radiation Processes Are Coupled in Accretion Disks? The Active Galactic Nucleus Case | Zendy

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How Much X-Ray and UV Radiation Processes Are Coupled in Accretion Disks? The Active Galactic Nucleus Case

Author(s) -

Daniel Proga

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/462417

Subject(s) - physics , active galactic nucleus , opacity , photon , astrophysics , corona (planetary geology) , compton scattering , accretion (finance) , radiative transfer , ultraviolet , accretion disc , radiation , thin disk , thick disk , astronomy , optics , galaxy , astrobiology , venus , halo

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 manyAGN, radiation pressure due to the very same UV disk photons can drive a flowfrom the disk into the corona and couple the processes producing X-rays and UVphotons. This coupling could lead to quenching of the disk corona because theregions above the UV disk will be too dense, too opaque, and consequently toocold. We discuss various consequences of this new type of the X-ray/UV couplingon the dynamical and radiative properties of AGN.Comment: to appear in ApJ Letter

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