The BU-FCRAO Milky Way Galactic Ring Survey

Details The BU-FCRAO Milky Way Galactic Ring Survey The BU-FCRAO Milky Way Galactic Ring Survey

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...20111222s&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #112.22; Bulletin of the American Astronomical Society, Vol. 34, p.1283

Astronomy and Astrophysics

Astronomy

Scientific paper

The Milky Way Galactic Ring Survey (GRS) continues to map J=1-> 0 13CO emission in the First Galactic Quadrant with an excellent combination of sensitivity (0.2 K), angular resolution (45''), and spectral resolution (0.2 km/s). Here we present the integrated intensity image and channel maps of our Second Release data (www.bu.edu/grs), covering 16 square degrees from l=40o to 51o and b=-1o to 0.5o. We also display maps of the 12CO/13CO intensity ratio using the UMASS-Stony Brook 12CO survey. In addition to confirming the widely accepted 12CO/13CO intensity ratio for the CO isotopes of 5-6 for the bulk of the Galactic emission seen from molecular clouds, we also find a significantly lower value of I(12CO)/I(13CO)=3 toward infrared-dark clouds (IRDCs) identified by Simon et al. Such low values suggest very large CO opacities and molecular column densities for the IRDCs. This work is supported by the National Science Foundation via grants AST-9800334 and AST-0098562 and the National Aeronautics and Space Administration via grant NAG5-10808.

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