Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...208..255g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 208, no. 1-2, Jan. 1989, p. 255-260.
Astronomy and Astrophysics
Astronomy
18
Carbon Monoxide, Galactic Nuclei, Infrared Sources (Astronomy), Line Of Sight, Absorption Spectra, Ionized Gases, Line Spectra, Microwave Spectra, Molecular Spectra, Radio Spectra
Scientific paper
High resolution absorption spectra of a low-lying fundamental vibration-rotation band line of carbon monoxide at 4.64 microns have been obtained toward several galactic center infrared sources. The absorption profiles show contributions over a wide range of velocities from a number of individual clouds which have been observed previously in radio and millimeter-wave molecular line spectra. They also demonstrate that the 20 km/s cloud is situated in front of the galactic center and that the 50 km/s cloud is located behind much or all of SgrA West. Two galactic center sources, IRS3 and IRS7, show strong absorptions near 50 km/s which may originate in the circumnuclear neutral ring; otherwise these objects must lie behind the 50 km/s cloud, and behind the galactic center by at least a few parsecs.
Baas F.
Geballe Thomas Ronald
Wade Richard
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