2MASS J21070267+4214099 , the SIMBAD biblio

2020ApJ...894...37N - Astrophys. J., 894, 37-37 (2020/May-1)

Detection of vibrational emissions from the helium hydride ion (HeH+) in the planetary nebula NGC 7027.

NEUFELD D.A., GOTO M., GEBALLE T.R., GUSTEN R., MENTEN K.M. and WIESEMEYER H.

Abstract (from CDS):

We report the detection of emission in the v = 1 - 0 P(1) (3.51629 µm) and P(2) (3.60776 µm) rovibrational lines of the helium hydride cation (HeH+) from the planetary nebula NGC 7027. These detections were obtained with the iSHELL spectrograph on NASA's Infrared Telescope Facility on Maunakea. They confirm the discovery of HeH+ reported recently by Gusten et al., who used the GREAT instrument on the SOFIA airborne observatory to observe its pure rotational J = 1 - 0 transition at 149.137 µm. The flux measured for the HeH+ v = 1 - 0 P(1) line is in good agreement with our model for the formation, destruction, and excitation of HeH+ in NGC 7027. The measured strength of the J = 1 - 0 pure rotational line, however, exceeds the model prediction significantly, as does that of the v = 1 - 0 P(2) line, by factors of 2.9 and 2.3 respectively. Possible causes of these discrepancies are discussed. Our observations of NGC 7027, covering the 3.26-3.93 µm spectral region, have led to the detection of more than 60 spectral lines including nine rovibrational emissions from CH+. The latter are detected for the first time in an astronomical source.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Interstellar medium - Interstellar molecules - Planetary nebulae - Molecular physics - Astrochemistry - Interstellar emissions - Infrared astronomy

Simbad objects: 4

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2021.09.18-18:50:15

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