Observations of rotationally resolved C3 in translucent sight lines

Details Observations of rotationally resolved C3 in translucent sight lines Observations of rotationally resolved C3 in translucent sight lines

2003-06-03

arxiv.org/abs/astro-ph/0306059v1

Astrophys.J. 595 (2003) 235-246

Astronomy and Astrophysics

Astrophysics

12 pages, 4 figures, accepted for publication in The Astrophysical Journal

Scientific paper

10.1086/377305

The rotationally resolved spectrum of the A ^1Pi_u <- X ^1Sigma^+_g 000-000 transition of C3, centered at 4051.6A, has been observed along 10 translucent lines of sight. To interpret these spectra, a new method for the determination of column densities and analysis of excitation profiles involving the simulation and fitting of observed spectra has been developed. The populations of lower rotational levels (J<14) in C3 are best fit by thermal distributions that are consistent with the kinetic temperatures determined from the excitation profile of C2. Just as in the case of C2, higher rotational levels (J>14) of C3 show increased nonthermal population distributions in clouds which have been determined to have total gas densities below ~500 cm-3.

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