Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....71..275w&link_type=abstract
Astronomy and Astrophysics, vol. 71, no. 3, Jan. 1979, p. 275-282.
Astronomy and Astrophysics
Astrophysics
49
Ammonia, Astronomical Spectroscopy, Interstellar Gas, Molecular Spectra, Nebulae, Astronomical Maps, Line Spectra, Optical Thickness, Radial Velocity, Spectral Line Width
Scientific paper
Radio observations of the (1, 1), (2, 2), and (3, 3) metastable lines of NH3 in the Orion Nebula are reported. The NH3 line emission is separated into two spatial components, a background ridge and an unresolved core. It is shown that the background is probably the same ridge detected in CO and other molecules and that the unresolved core is centered on the IR cluster in the Kleinmann-Low nebula. The core source is found to consist of three velocity components: (1) a strong narrow optically thick feature at an LSR velocity of 9 km/s and with a rotation temperature of about 60 K; (2) a weaker narrow feature at an LSR velocity of 3 km/s that appears to be optically thin and to originate in a hot region with a rotation temperature in excess of 200 K; and (3) a broad line with a width of approximately 50 km/s and a rotational temperature of about 40 K. An upper limit of 20 arcsec is placed on the size of the emission region for the narrow-line component at 9 km/s, and a lower limit of 350 is obtained for the (N4-14)H3/(N-15)H3 ratio, which is close to the terrestrial value of 279.
Bieging John
Downes Dennis
Wilson Thomas L.
No associations
LandOfFree
Ammonia in Orion 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 Ammonia in Orion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ammonia in Orion will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1140826