A new Unidentified Far Infrared Band in NGC7027

Details A new Unidentified Far Infrared Band in NGC7027 A new Unidentified Far Infrared Band in NGC7027

2004-03-15

arxiv.org/abs/astro-ph/0403348v1

Astrophys.J. 609 (2004) 225-230

Astronomy and Astrophysics

Astrophysics

15 pages, 2 figures, accepted in ApJ part I

Scientific paper

10.1086/421061

We report on the detection of a molecular band centered at ~98 um (~102 cm^-1), observed with the Infrared Space Observatory in the young Planetary Nebula NGC7027. The band structure and intensity can not be reproduced by atomic fine structure lines, recombination lines or by the rotational emission of abundant molecules. We discuss the possible contribution of the low-energy bending modes of pure carbon chains to the unidentified far-IR bands (UfIBs) observed in C-rich evolved objects. In particular, we speculate that the band emission could arise from the nu_9 and nu_7 bending modes of C_6 and C_5, for which wavenumbers of 90+/-50 and 107+/-5 cm^-1 have been estimated from photoelectron spectroscopy.

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