The BU-FCRAO Galactic Ring Survey: Resolving the Near-Far Kinematic Distance Ambiguity

Details The BU-FCRAO Galactic Ring Survey: Resolving the Near-Far Kinematic Distance Ambiguity The BU-FCRAO Galactic Ring Survey: Resolving the Near-Far Kinematic Distance Ambiguity

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.2503j&link_type=abstract

American Astronomical Society, 196th AAS Meeting, #25.03; Bulletin of the American Astronomical Society, Vol. 32, p.708

Astronomy and Astrophysics

Astronomy

Scientific paper

We compare 13CO 1-0 data from the BU-FCRAO Galactic Ring Survey to H I 21 cm data from the BU-Arecibo H I Galactic Plane Survey. We often find a remarkable correlation in both position and velocity between 13CO emission and H I absorption. Because H I emission is ubiquitous throughout the Galaxy, with sufficient angular resolution, the cold H I can be used to determine whether the molecular cloud lies at the near or far kinematic distance. Clouds at the near distance will show H I self-absorption, whereas clouds at the far distance will show H I in emission. This technique has the potential to resolve the kinematic distance ambiguity by cleanly separating near clouds from far clouds.

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