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**Session 90 - High Energy Phenomena in AGNs.**

*Oral session, Friday, January 09*

*Georgetown, *

## [90.06] Analytic forms for Hard X-ray Spectra with Compton Reflection

*D. A. Schwartz (SAO)*
Compton reflection of hard X-rays seems to be a common
process in AGN. It is potentially significant both as a diagnostic of
individual AGN, and because the emission of all AGN likely make up the
diffuse X-ray background. We follow the classical, "multi-stream"
method as presented by Chandrasekhar, to develop an approximate
solution for the Compton reflection of a power law X-ray spectrum
incident on a semi-infinite, plane parallel slab. The set of particular
solutions of the transfer equations can be combined to solve a
variety of boundary conditions; e.g., an isotropic or 1/cos law for the
incident spectrum, or even to consider a finite optical depth for the
slab. For pure Thomson scattering, (applicable in the 20 to
100 keV range), a third order polynomial in the energy adequately
fits the albedo. The coefficients of the polynomial are particular
numerical values depending on the boundary conditions and the
exiting angle, and depending on integer powers of the incident photon
index. These expressions are therefore very time efficient for
fitting to actual X-ray spectral data.

**Program
listing for Friday**