Ammonia in the neutral ring around the galactic center

Details Ammonia in the neutral ring around the galactic center Ammonia in the neutral ring around the galactic center

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...161..334s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 161, no. 2, June 1986, p. 334-338.

Astronomy and Astrophysics

Astrophysics

26

Ammonia, Galactic Nuclei, Molecular Clouds, Absorption Spectra, Carbon Monoxide, Interstellar Masers, Molecular Rotation, Spectrum Analysis

Scientific paper

Several metastable NH3 lines have been detected from the molecular gas which orbits about the center of our galaxy at radii ⪆2 pc. A rotational temperature of ≡95K is estimated for this gas, implying a kinetic temperature of 240±100K. Several spectral features arising from gas along the line of sight to the center have also been detected. Gas at 40 km s-1 is seen in absorption in the higher lying inversion transitions. From a comparison of the excitation temperatures of the levels with the background continuum temperature, the density of this gas is estimated to be ≡1 - 3x104cm-3. Also seen are NH3 absorption features at -135, -51, -30 and -3 km s-1, associated with the "expanding molecular ring at 300 pc" and with the spiral structure of our galaxy. The three lower velocity features have Trot ⪉ 14 - 19K.

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