The COMPLETE Calibration of 12CO and 13CO in Perseus

Details The COMPLETE Calibration of 12CO and 13CO in Perseus The COMPLETE Calibration of 12CO and 13CO in Perseus

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.5505p&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #55.05; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

We use COMPLETE molecular line maps, 12CO and 13CO (1-0) data, together with the extinction map, derived using the NICER algorithm, to study the properties of the gas in the whole Perseus Molecular Complex. We derive LTE 13CO column densities and a linear conversion to estimate the extinction. Comparing with previous results in the same region we find similar 13CO abundances but significant differences in the threshold extinction value (AVo), above which 13CO is detected. This suggests that differences in the environment (especially in the impinging radiation field) may cayse the observed local changes in abundance, dust and gas temperature as well as AVo.
In addition, we present new NH3 and CCS data recently obtained with the GBT and perform a comparison between the different tracers, in particular between central velocities, line widths, and excitation temperatures. Abundance ratios across the Perseus Complex will also be presented and correlated with differences in AVo, to check if different environmental properties also affect the embedded dense cores.
JEP is supported by a student support grant from the National Radio Astronomy Observatory and by the National Science Foundation through grant #AF002 from the Association of Universities for Research in Astronomy, Inc., under NSF cooperative agreement AST-9613615 and by Fundación Andes under project No. C-13442. JBF is supported by a student support grant from the National Radio Astronomy Observatory.

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