Hot ammonia in the Galaxy

Details Hot ammonia in the Galaxy Hot ammonia in the Galaxy

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...162..199m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 162, no. 1-2, July 1986, p. 199-210.

Astronomy and Astrophysics

Astronomy

92

Ammonia, Interstellar Gas, Milky Way Galaxy, Molecular Gases, Abundance, High Temperature Gases, Hydrogen Clouds, Nebulae, Radio Sources (Astronomy)

Scientific paper

The (J, K) = (7,7) metastable inversion line of ammonia has been detected in interstellar space; measurements are reported for 15 sources. Since these levels are 535K above the ground state, the detection of such lines indicates the presence of hot (TK > 100K) molecular gas. On the basis of TK, source size, and NH3 abundance, the authors classify these hot clouds into two groups. For those outside the galactic center, there is a similarity to the hot core in Orion KL. Here the heating of the NH3 is provided by collisions with warm grains which are in turn heated by IR sources. For the hot clouds in the galactic center, where the H2 densities are lower and the dust is cooler, the most likely process involves the conversion of rotational energy into turbulence, and thus heat.

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