A Study of CO Emission from Molecular Clouds in the Northern Milky Way

Details A Study of CO Emission from Molecular Clouds in the Northern Milky Way A Study of CO Emission from Molecular Clouds in the Northern Milky Way

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985baas...17..606d&link_type=abstract

Bulletin of the American Astronomical Society, 17, 606 (1985)

Other

Scientific paper

Molecular clouds in the Galactic quadrant from l = 12 deg - 100 deg were fully sampled over a wide latitude range in the 115 GHz line of CO with the Columbia University 1.2 m telescope. A preliminary survey, completed several years ago, covered the latitude range -5 deg to +6 deg with extensions to +11 deg to map specific clouds; this area was fully sampled with a synthesized 1 deg beam to an rms noise of 0.43 K per 0.65 km/s spectral channel. We have now undertaken a new CO survey of the region with improved sensitivity (0.28 K rms) and angular resolution (0.5 deg beam); we expect to cover +/-10 deg in latitude by the end of this year, and to date have covered +/-7 deg, again with extensions to +11 deg. CO emission, detected from about half the region surveyed, comes nearly equally from local clouds associated with the Great Rift in the Milky Way and from distant clouds in the inner spiral arms of the Galaxy 4 to 7 kpc from the Galactic center. Using the CO radial velocities, it is possible to resolve the Rift into distinct molecular clouds 200 to 2300 pc away, to associate many of these with optical objects (dark nebulae, OB associations, etc.), and to determine distances and masses. The mean half- thickness at half-intensity of local molecular gas is estimated to be 75 +/- 25 pc, in agreement with that obtained at the solar circle by other CO surveys; the mean molecular column density at midplane is 0.013 Mo pc-3. The correlation between the integrated CO line intensity and optical obscuration throughout the region is close, demonstrating that nearly all dark nebulae are molecular clouds and vice versa.

Affiliated with

Also associated with

No associations

Rating

A Study of CO Emission from Molecular Clouds in the Northern Milky Way does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A Study of CO Emission from Molecular Clouds in the Northern Milky Way, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Study of CO Emission from Molecular Clouds in the Northern Milky Way will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-820963