The UMass/INAOE Galaxy Survey

Details The UMass/INAOE Galaxy Survey The UMass/INAOE Galaxy Survey

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.4722p&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #47.22; Bulletin of the American Astronomical Society, Vol. 31, p.892

Astronomy and Astrophysics

Astronomy

Scientific paper

We are using the unique mapping capability and sensitivity of the new 16-element array SEQUOIA at the Five College Radio Astronomy Observatory to map the extended (13) CO and (12) CO J=1-0 emission from over 50 galaxies. The survey involves more than a dozen undergraduates who are responsible for taking the data, judging its quality, and reducing and analyzing the maps. This project should span 2 to 3 observing seasons. Our goals are to: (1) map the full extent of their molecular emission, (2) find the (12) CO/(13) CO ratio with position, (3) determine whether this ratio varies with galactocentric radius or other galaxy properties. As an array, SEQUOIA can detect such changes with negligible uncertainties in relative calibration and pointing. In this, our first season of operation, we concentrated on the emission along the major axes of 8 nearby galaxies that have bright, extended molecular emission. Overall, the (12) CO/(13) CO ratio rises toward the nuclei of these galaxies, with an average peak value ~ 25.

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