Discovery of Far-IR Pure Rotational Transitions of CH + in NGC 7027

Details Discovery of Far-IR Pure Rotational Transitions of CH + in NGC 7027 Discovery of Far-IR Pure Rotational Transitions of CH + in NGC 7027

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...483l..65c&link_type=abstract

Astrophysical Journal Letters v.483, p.L65

Astronomy and Astrophysics

Astronomy

55

Ism: Planetary Nebulae: Individual Ngc Number: Ngc 7027, Infrared: Ism: Lines And Bands

Scientific paper

We report the discovery of the rotational spectrum of CH+ in the Infrared Space Observatory Long Wavelength Spectrometer (LWS) spectrum of the planetary nebula NGC 7027. The identification relies on a 1996 reanalysis of the LWS spectrum by Liu et al. and on new LWS data. The strong line at 179.62 mu m (coinciding with the 212--101 transition of water vapor) and the lines at 119.90 and 90.03 mu m (reported as unidentified by Liu et al.), whose frequencies are in the harmonic relation 2 : 3:4, are shown to arise from the J = 2--1, 3--2, and 4--3 rotational transitions of CH+. This identification is strengthened by the new LWS spectra of NGC 7027, which clearly show the next two rotational lines of CH+ at 72.140 and 60.247 mu m. This is the first time that the pure rotational spectrum of CH+ has been observed. This discovery opens the possibility of probing the densest and warmest zones of photodissociation regions. We derive a rotational temperature for the CH+ lines of 150 +/- 20 K and a CH+/CO abundance ratio of 2--6 x 10-4.

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