A New Unidentified Far‐Infrared Band in NGC 7027 | Zendy

J. R. Goicoechea | Zendy; J. Cernicharo | Zendy; H. Massó | Zendy; M. L. Senent | Zendy

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A New Unidentified Far‐Infrared Band in NGC 7027

Author(s) -

J. R. Goicoechea,

J. Cernicharo,

H. Massó,

M. L. Senent

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/421061

Subject(s) - infrared , planetary nebula , physics , infrared spectroscopy , spectroscopy , astrophysics , bending , molecule , atomic physics , astronomy , stars , quantum mechanics , thermodynamics

We report on the detection of a molecular band centered at ~98 um (~102cm^-1), observed with the Infrared Space Observatory in the young PlanetaryNebula NGC7027. The band structure and intensity can not be reproduced byatomic fine structure lines, recombination lines or by the rotational emissionof abundant molecules. We discuss the possible contribution of the low-energybending modes of pure carbon chains to the unidentified far-IR bands (UfIBs)observed in C-rich evolved objects. In particular, we speculate that the bandemission could arise from the nu_9 and nu_7 bending modes of C_6 and C_5, forwhich wavenumbers of 90+/-50 and 107+/-5 cm^-1 have been estimated fromphotoelectron spectroscopy.Comment: 15 pages, 2 figures, accepted in ApJ part

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