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[112.22] The BU-FCRAO Milky Way Galactic Ring Survey

R.Y. Shah, R. Simon, E. Flynn, J.M. Jackson, T.M. Bania, D.P. Clemens (Institute for Astrophysical Research, Boston University), M.H. Heyer (Five College Radio Astronomy Observatory, University of Massachusetts, Amherst), A. Johnson, M. Kolpak, K. McQuinn, O. Fox, I. Kubiszewski, D. Nero, K. Rogers, T. Veach (Institute for Astrophysical Research, Boston University)

The Milky Way Galactic Ring Survey (GRS) continues to map J=1arrow 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=40^o to 51^o and b=-1^o to 0.5^o. 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.

If you would like more information about this abstract, please follow the link to http://www.bu.edu/grs. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser.

The author(s) of this abstract have provided an email address for comments about the abstract: ronak@bu.edu

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.