Newly discovered sources of non-metastable ammonia

Details Newly discovered sources of non-metastable ammonia Newly discovered sources of non-metastable ammonia

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...146..168m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 146, no. 1, May 1985, p. 168-174.

Astronomy and Astrophysics

Astronomy

40

Ammonia, Interstellar Gas, Line Spectra, Molecular Clouds, Radio Astronomy, Stellar Evolution, Abundance, Astronomical Spectroscopy, Density Distribution, Gas Temperature, H Ii Regions, Hydroxyl Radicals, Metastable State, Water Masers

Scientific paper

Detections of the (J,K) = (2,1) non-metastable inversion line of ammonia in eight sources near compact H II regions or OH and H2O masers are reported. The authors report a first detection of the (5,3) line and a second detection of the (4,2) line, both found in W51e. If the non-metastable levels are collisionally excited, the H2 densities should be greater than 105cm-3, and hence non-metastable ammonia lines are expected to be indicators for high density regions. The measurements of various metastable NH3 lines and model calculations allow estimates of the rotational, Tr, and kinetic temperatures, Tk, in these regions. The authors have estimated source sizes, virial masses, and average H2 densities. These densities are compared with those obtained from statistical equilibrium calculations. The H2 densities and source sizes are used to obtain column densities of H2 and the abundance ratios of NH3 relative to H2. Comparisons with values of Tk and n(H2) from studies of other molecules are made.

Affiliated with

Also associated with

No associations

Rating

Newly discovered sources of non-metastable ammonia 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 Newly discovered sources of non-metastable ammonia, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Newly discovered sources of non-metastable ammonia will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1630239