Other
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apjs...80..305w&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 80, no. 1, May 1992, p. 305-345.
Other
2
Galactic Structure, Interstellar Gas, Milky Way Galaxy, Molecular Clouds, Astronomical Spectroscopy, Carbon Monoxide, Emission Spectra, Star Distribution
Scientific paper
Estimates are presented of the distances to the nearest CO-emitting material along 31,500 lines of sight in the northern Milky Way on the basis of an analysis of the Massachusetts-Stony Brook survey of CO emission in the first Galactic quadrant. For Galactic latitudes between -1.0 and +1.0 deg and longitudes between 8 and 53 deg, significant CO emission (greater than 1.2 K) and associated optical obscuration (greater than 1.2 mag) is found within 2 kpc of the sun in 21,149 of the lines of sight. Much of this local emission is associated with the Aquila Rift system of dark clouds. Another 8,179 lines of sight are obscured at distances between 2 and 10 kpc. The remaining 2,172 lines of sight are completely free of significant CO emission. These cloud-free positions can be used as 'offs' for radio or IR spectroscopy of molecular sources in the Galactic plane, as 'ons' for studies of the diffuse intercloud medium itself, and as possible 'windows', through which distant disk and bulge stars might be optically observable.
Tacconi-Garman Lowell Evan
Waller William H.
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