Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..157g&link_type=abstract
SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.
Astronomy and Astrophysics
Astrophysics
Scientific paper
The photoionization code TITAN, developed by our team, is well suited for the study of both optically thick and thin ionized media. It treats all relevant physical processes from each level and all induced processes, computing the gas structure in thermal and ionization equilibria. It gives as output the ionization, density, and temperature structures, as well as the reflected, emitted outward, and absorbed spectra. Its advantages over other photoionization codes are the exact transfer of both the lines and the continuum, using the Accelerated Lambda Iteration method, and the possibility of treating the ionized gas in total (gas+radiation) pressure. Models in pressure equilibrium present temperature discontinuities which, however difficult to tackle, can be adressed with TITAN. The most recent version of our code allows to choose between the hot and the cold stable solutions in the multi-branch regime of the S-curve, and then to compute a fully consistent photoionisation model with the chosen solution. For the first time, it is thus possible to compare the true stable solution models with the approximate solution model, used so far. We have studied the thermal instabilities in thick stratified X-ray illuminated media and compared the behavior of both kind of models. Our studies may be applied to media in any pressure equilibrium conditions, like constant gas pressure, constant total pressure, or hydrostatic pressure equilibrium.
Collin Suzy
Dumont Anne-Marie
Goncalves Alexandre C.
No associations
LandOfFree
TITAN: a transfer-photoionisation code for hot, thick media does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with TITAN: a transfer-photoionisation code for hot, thick media, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and TITAN: a transfer-photoionisation code for hot, thick media will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1480455