Millimeter-wave absorption features toward the galactic center - Evidence for a massive nuclear disk

Details Millimeter-wave absorption features toward the galactic center - Evidence for a massive nuclear disk Millimeter-wave absorption features toward the galactic center - Evidence for a massive nuclear disk

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243..147l&link_type=abstract

Astrophysical Journal, Part 1, vol. 243, Jan. 1, 1981, p. 147-154.

Astronomy and Astrophysics

Astrophysics

67

Absorption Spectra, Galactic Nuclei, Interstellar Chemistry, Interstellar Gas, Microwave Spectra, Millimeter Waves, Molecular Gases, Abundance, Carbon Isotopes, Carbon Monoxide, Line Spectra, Molecular Ions

Scientific paper

The detection of molecular gas which appears in absorption at large negative velocities near the galactic center for a number of millimeter-wavelength molecular transitions previously observed only in emission is reported. Millimeter-continuum emission measurements have been made which show that the absorbing line is optically thick in HCO(+) and has an excitation temperature consistent with no collisional excitation from -117 to -83 km/s toward Sgr B2. At these velocities CO is seen in emission at a level of 3 K. Molecular column densities are obtained for five species and a molecular hydrogen column density of approximately 5 x 10 to the 23rd/sq cm to Sgr B2 is estimated. This absorbing gas is associated with the nuclear disk and it is estimated that the total mass involved is approximately 8 x 10 to the 9th solar masses. It is shown that spiral arms in the galactic disk also appear as absorption features in HCO(+) and HCN.

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