Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-09-27
Monthly Notices of the Royal Astronomical Society, 2010, Volume 402, Issue 4, pp. 2548-2558
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
11 pages, 3 figures, MNRAS 2010
Scientific paper
10.1111/j.1365-2966.2009.16065.x
Using high-resolution (~85000) and high signal-to-noise ratio (~200) optical spectra acquired with the European Southern Observatory Ultraviolet and Visual Echelle Spectrograph, we have determined the interstellar column densities of C2 for six Galactic lines of sight with E(B- V) ranging from 0.33 to 1.03. For our purposes, we identified and measured absorption lines belonging to the (1, 0), (2, 0) and (3, 0) Phillips bands A1{\Pi}u-X1{\Sigma}+g. We report on the identification of a few lines of the C2 (4, 0) Phillips system towards HD 147889. The curve-of-growth method is applied to the equivalent widths to determine the column densities of the individual rotational levels of C2. The excitation temperature is extracted from the rotational diagrams. The physical parameters of the intervening molecular clouds (e.g. gas kinetic temperatures and densities of collision partners) were estimated by comparison with the theoretical model of excitation of C2.
Bondar Alex
Kaźmierczak Marcin
Krelowski Jacek
Schmidt Mirek R.
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