Detection of the /8,8/ and /9,9/ absorption lines of ammonia - The hot molecular cloud toward SGR B2

Details Detection of the /8,8/ and /9,9/ absorption lines of ammonia - The hot molecular cloud toward SGR B2 Detection of the /8,8/ and /9,9/ absorption lines of ammonia - The hot molecular cloud toward SGR B2

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...115..185w&link_type=abstract

Astronomy and Astrophysics, vol. 115, no. 1, Nov. 1982, p. 185-189.

Astronomy and Astrophysics

Astrophysics

72

Absorption Spectra, Ammonia, Line Spectra, Molecular Clouds, Molecular Spectra, Galactic Nuclei, Gas Temperature, Hydrogen Clouds, Metastable State, Molecular Excitation

Scientific paper

Absorption in the (J, K) equals (8, 8) and (9, 9) metastable lines of ammonia is reported for the 63 km/s cloud toward Sgr B2. The lines are in pure absorption, consistent with a low-density (an nH2 of approximately 10,000/cu cm), high-temperature (approximately 200 K) region. A possible heating mechanism for the gas might be turbulence, driven by the shearing motion of the cloud. It is concluded that the cloud seen in absorption, as well as other galactic center clouds, may be dissipating the supersonic motions which are known to be present in this region. The ultimate energy source may then be the galactic rotation field.

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