Ammonia observations of DR 21, W51, NGC 1333, and other sources

Journal Article · Wed Oct 15 00:00:00 EDT 1980 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/158378· OSTI ID:6848604

Matsakis, D N; Bologna, J M; Schwartz, P R; Cheung, A C; Townes, C H

The ammonia clouds in DR 21, W51, NGC 1333, NGC 2264, L134 N, and S140 have been mapped in several transitions. Ammonia has also been detected in several other sources we well. The DR 21 data reveal a long, narrow emission ridge and suggest a slight anomaly in the NH/sub 3/(1,1) satellite emission, as was previously predicted. The validity of the single-temperature local thermodynamic equilibrium (LTE) model is discussed, and curves describing the effect of a gradient in excitation temperature are presented.

• Research Organization: E.O. Hulbert Center for Space Research, Naval Research Laboratory, Washington, DC
• OSTI ID: 6848604
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 241:2; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMMONIA
ELECTROMAGNETIC RADIATION
EMISSION
ENERGY SPECTRA
ENERGY-LEVEL TRANSITIONS
EQUILIBRIUM
HYDRIDES
HYDROGEN COMPOUNDS
INTERSTELLAR GRAINS
LTE
NEBULAE
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
PARTICLES
RADIATIONS
RADIOWAVE RADIATION
SPECTRA