Detection of C$_{3}$ in Diffuse Interstellar Clouds

Details Detection of C$_{3}$ in Diffuse Interstellar Clouds Detection of C$_{3}$ in Diffuse Interstellar Clouds

2001-02-26

arxiv.org/abs/astro-ph/0102449v1

Astronomy and Astrophysics

Astrophysics

14 pages, 5 figures, 3 tables. To appear in the Astrophysical Journal

Scientific paper

10.1086/320668

The smallest polyatomic carbon chain, C$_{3}$, has been identified in interstellar clouds (A$_{v}\sim$1 mag) towards $\zeta$ Ophiuchi, 20 Aquilae, and $\zeta$ Persei by detection of the origin band in its $A^{1}\Pi_{u}-X^{1}\Sigma^{+}_{g}$ electronic transition, near 4052\AA. Individual rotational lines were resolved up to $J$=30 enabling the rotational level column densities and temperature distributions to be determined. The inferred limits for the total column densities ($\sim$1 to 2$\times10^{12}$ cm$^{-2}$) offer a strong incentive to laboratory and astrophysical searches for the longer carbon chains. Concurrent searches for C$_2^{+}$, C$_2^{-}$ and C$_3^{-}$ were negative but provide sensitive estimates for their maximum column densities.

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