Physics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.322..524h&link_type=abstract
Nature (ISSN 0028-0836), vol. 322, Aug. 7, 1986, p. 524-526.
Physics
22
Electron Transitions, Hydronium Ions, Interstellar Chemistry, Line Spectra, Electron Recombination, Interstellar Gas, Molecular Clouds, Orion Nebula, Thermalization (Energy Absorption)
Scientific paper
Double-sideband observations of the Orion KL nebular region with the NRAO 12 m radiotelescope in March 1986 detected a weak emission spectral line that coincided with the P(2,1) rotation-inversion transition of H3O+. Spectral maps are provided for the observed line at 307,192 MHz with 2 and 1 MHz resolution. The line parameters, along with a calculated transition dipole moment of 1.44 D, are used to estimate column densities of 7.7 and 8.7 x 10 to the 13/sq cm for excitation temperatures of 50 and 90 K, respectively. A minimum H2 density of 1 million/cu cm is estimated for the region if the thermalization of the transition to the excitation temperatures is to occur. Finally, fractional abundances of H2O in the Orion cloud are projected to be 1/100,000 and 1/1 million for the nonthermal and thermal transition cases, respectively.
Churchwell Edward B.
de Lucia Frank C.
Herbst Eric
Hollis Jan. M.
No associations
LandOfFree
An interstellar line coincident with the P(2,1) transition of hydronium (H3O+) does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with An interstellar line coincident with the P(2,1) transition of hydronium (H3O+), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An interstellar line coincident with the P(2,1) transition of hydronium (H3O+) will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-894193