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C.J. Law, R. Simon, T.M. Bania, D.P. Clemens (Institute for Astrophysical Research, Boston University), M.H. Heyer (FCRAO, University of Massachusetts, Amherst), J.M. Jackson, M.A. Kolpak (Institute for Astrophysical Research, Boston University)
As a part of the Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey, we have mapped both 13CO(1-0) and CS(2-1) over two square degrees (44.25 < l < 46.25, -0.5 < b < 0.5). Because CS has a higher critical density than 13CO, the 13CO/CS brightness ratio is sensitive to volume density. The GRS offers an unbiased, high-resolution dataset to examine the 13CO/CS ratio toward a variety of objects, ranging from dense, star-forming regions to cool, diffuse clouds. We find that this ratio varies by factors of ~7 between star-forming cores and diffuse clouds, and that this variation most likely reflects density variation. We also find that 13CO data alone are sufficient to identify star forming cores.
The Galactic Ring Survey is supported by NSF grant AST-9800334.
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