Ammonia Observations of NGC 6334 I(N)

Details Ammonia Observations of NGC 6334 I(N) Ammonia Observations of NGC 6334 I(N)

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...446..692k&link_type=abstract

Astrophysical Journal v.446, p.692

Astronomy and Astrophysics

Astronomy

23

Ism: Individual Ngc Number: Ngc 6334, Radio Lines: Ism

Scientific paper

Coincident with the far-infrared source NGC 6334 1(N) and water maser source E is a massive dense cloud which has the most intense ammonia (1, 1) emission of any known interstellar cloud. We have mapped the (3, 3) emission and find the cloud is extended 0.8 pc in the direction parallel to the Galactic plane, and 0.5 pc perpendicular to it. It has a velocity gradient of 1 km s-1 pc-1 perpendicular to the Galactic plane. The gas kinetic temperature is about 30 K and the density is greater than 106 cm-3. The mass of the cloud is about 3000 Msun, 3 times greater than previously estimated. The para-ammonia column density is 6-8 × 1015 cm-2. An ammonia abundance of 0.5-1.5 × 10-8 is inferred, where the larger number assumes an early time ortho/ para ratio. This suggests either a cloud age of less than ˜106 yr, or substantial depletion of ammonia.

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