The Two-Phase Pair Corona Model for Active Galactic Nuclei and X-ray Binaries: How to Obtain Exact Solutions

Abstract

We consider two phase accretion disk-corona models for active galactic nuclei and some X-ray binaries. We describe in detail how one can exactly solve the polarized radiative transfer and Comptonization using the iterative scattering method, while simultaneously solving the energy and pair balance equation for both the cold and hot phases. We take into account Compton scattering, photon-photon pair production, pair annihilation, bremsstrahlung, and double Compton scattering, as well as exact reflection from the cold disk. We consider coronae having slab geometry as well as coronae consisting of one or more well separated active regions of cylinder or hemisphere geometry. The method is useful for determining the spectral intensity and the polarization emerging in different directions from disk-corona systems. The code is tested against a Monte-Carlo code. We also compare with earlier, less accurate, work. The method is more than an order of magnitude faster than applying Monte Carlo methods to the same problem and has the potential of being used in spectral fitting software such as XSPEC.

39 pages; AASTEX 4.0; 6 postscript figures; ApJ, Oct 10, 1996

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• Black holes: accretion processes in X-ray binaries
• The NuSTAR view of Ultra-Compact X-ray Binaries
• A possible two-fold scenario for the disc-corona of the luminous AGN 1H 0419--577: a high-density disc or a warm corona
• Interaction between disk and extended corona in a general relativistic framework
• X-ray polarization in radio-quiet AGN: Insights from the wedge corona model using Monte Carlo simulations
• Accretion Geometry of Black Hole X-ray Binaries: Insights from X-ray Observations
• Supermassive black holes and their surroundings: MeV signatures
• Optical polarimetry of the accreting black hole X-ray binary Swift J1727.8$-$1613 over the state transition and radio ejections
• X-ray polarization observations of NGC 2110 with IXPE
• Spectral analysis of a large sample of BeppoSAX Seyfert spectra with Comptonization models: Preliminary results
• Shape and ionization of equatorial matter near compact objects from X-ray polarization reflection signatures
• Neutron star atmospheres composed of fusion ashes
• Photon Escape from Slab Thomson Media: A Scattering-order-resolved Recursive Formalism for Comptonization Applications