2009A&A...499..349C -
Astronomy and Astrophysics, volume 499, 349-355 (2009/5-3)
Thermal instability in X-ray photoionized media in active galactic nuclei. II. Role of the thermal conduction in warm absorber.
CZERNY B., CHEVALLIER L., GONCALVES A.C., ROZANSKA A. and DUMONT A.-M.
Abstract (from CDS):
A photoionized gas under constant pressure can display thermal instability with three or more solutions for possible thermal equilibrium. A unique solution of the structure of the irradiated medium is obtained only if electron conduction is considered. The subject of our study is to estimate how the efect of thermal conduction affects the structure and transmitted spectrum of the warm absorber, computed by solving radiative transfer with the code titan. We developed a new computational mode for the code titan to obtain several solutions for a given external conditions and we test a posteriori which solution is the closest one to the required integral condition based on conduction. We demonstrate that the automatic mode of the code titan provides the solution to the radiative transfer, that is generally consistent with the estimated exact solution within a few per cent accuracy, with larger errors for some line intensities (up to 20 per cent) for iron lines in an intermediate ionization state.
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Journal keyword(s):
instabilities - radiation mechanisms: thermal - radiative transfer - galaxies: active - X-rays: general - X-rays: galaxies
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ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
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