2000/03/06 by Sergei A. Levshakov, S. A. Levshakov, I. I. Agafonova +6 · 1 citation
Chemistry · Engineering · Physics and Astronomy · #Astrophysics (astro-ph) #Chemical Thermodynamics and Molecular Structure #FOS: Physical sciences #Phase Equilibria and Thermodynamics #Spectroscopy and Chemometric Analyses #Spectroscopy and Laser Applications #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0003078
14 pages, 5 ps figures, l-aa.sty file, submit. AA
arxiv created 2000/03/06 · openalex publication_date 2000/03/06 · arxiv updated 2009/12/01 · openalex created_date 2025/10/24 · openalex updated_date 2026/07/28
A new method, based on the simulated annealing algorithm and aimed at the\ninverse problem in the analysis of intergalactic (interstellar) complex spectra\nof hydrogen and metal lines, is presented. We consider the process of line\nformation in clumpy stochastic media accounting for fluctuating velocity and\ndensity fields (mesoturbulence). This approach generalizes our previous Reverse\nMonte Carlo and Entropy-Regularized Minimization methods which were applied to\nvelocity fluctuations only. The method allows one to estimate, from an observed\nsystem of spectral lines, both the physical parameters of the absorbing gas and\nappropriate structures of the velocity and density distributions along the line\nof sight. The validity of the computational procedure is demonstrated using a\nseries of synthetic spectra that emulate the up-to-date best quality data. HI,\nCII, SiII, CIV, SiIV, and OVI lines, exhibiting complex profiles, were fitted\nsimultaneously. The adopted physical parameters have been recovered with a\nsufficiently high accuracy. The results obtained encourage the application of\nthe proposed procedure to the analysis of real observational data.\n