SIMBAD references

2009ApJ...691.1494G - Astrophys. J., 691, 1494-1500 (2009/February-1)

A survey of C4H, C6H, and C6H with the Green Bank Telescope.


Abstract (from CDS):

A survey of the carbon chain negative ion C6H and the structurally similar radicals C4 H and C6H has been done with the 100 m Green Bank Telescope toward 24 galactic molecular sources. The most readily observed molecular anion to date, C6H was detected in two new sources: the dark clouds L1544 and L1521F, where it was found to be present at the level of 2.5%±0.8% and 4%±1%, respectively relative to neutral C6H. C4 H was detected in nearly all dark clouds surveyed (in six for the first time), and C6 H was detected in five dark clouds and one translucent cloud. The observed C6H/C6 H (1%-4%) and C6H/C4H (0.2%-1%) ratios in these sources suggest that C6H may be close to detection in many other dark clouds. The fractional ionization derived from the C6H/C6 H ratio in L1544 and L1521F of 10–8 to 10–7 is comparable to earlier estimates from positive molecular ions.

Abstract Copyright:

Journal keyword(s): ISM: molecules - molecular data - molecular processes - radio lines: ISM

Simbad objects: 33

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