Thermal instability in X-ray photoionized media in active galactic nuclei:

2006/12/01 by A. C. Goncalves, António Gonçalves, S. Collin +3
Physics and Astronomy · #Active galactic nucleus #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Star Formation Studies #Atomic physics #Context (archaeology) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Geology #Instability #Mechanics #Optics #Physics #Radiation #Thermal #Thermal equilibrium #Thermal instability #Thermal radiation #Thermodynamics #astro-ph

paper · pdf · doi:10.1051/0004-6361:20066089

LaTeX file: 18 pages, including 14 figures. Accepted for publication in Astronomy & Astrophysics

arxiv created 2006/12/01 · openalex publication_date 2007/01/02 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Context.A photoionized gas in thermal equilibrium can display a thermal instability, with three or more solutions in the multi-branch region of the S-shape curve that gives the temperature versus the radiation-to-gas-pressure ratio. Many studies have been devoted to this curve and to its dependence on different parameters, always in the optically thin case.

Citations

• Cosmic-Ray Heating of the Interstellar Gas
• A new type of photoionized code required for the new era of X-ray spectroscopy
• CLOUDY 90: Numerical Simulation of Plasmas and Their Spectra
• Two-phase radiative/conductive equilibrium in active galactic nuclei and galactic black holes
• Reprocessing of X-rays in AGN. I. Plane parallel geometry -- test of pressure equilibrium