On ultracold molecular gas toward the galactic center

Details On ultracold molecular gas toward the galactic center On ultracold molecular gas toward the galactic center

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235..840z&link_type=abstract

Astrophysical Journal, Part 1, vol. 235, Feb. 1, 1980, p. 840-844.

Astronomy and Astrophysics

Astronomy

5

Carbon Monoxide, Emission Spectra, Galactic Nuclei, Infrared Astronomy, Interstellar Gas, Molecular Gases, Absorption Spectra, Milky Way Galaxy, Optical Thickness, Spectral Resolution, Temperature Effects

Scientific paper

Several positions near the galactic center (Sgr A) in the J=1-0 rotational transitions of (C-12)O, (C-13)O, and C(O-18) were observed in order to better understand the nature of the 'very cold' molecular gas whose existence was first stressed by Liszt and his colleagues (1975, 1977). It is established that several dips in the (C-12)O spectra are due to optically thick clouds of foreground CO with relatively low excitation temperatures (Tex). Tex is found to be greater than about 5.3 K for all such (C-12)O clouds in all five observed directions. Such clouds fall at the extreme low end of the measured range of Tex for nearby dark clouds, but would, nonetheless, generally be detected in sensitive emission surveys of galactic CO.

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