AAS 207th Meeting, 8-12 January 2006
Session 163 Star Formation Grab Bag I
Oral, Wednesday, 2:00-3:30pm, January 11, 2006, Wilson A/B

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[163.01] Gas-phase CO2 emission toward Cepheus A East: the result of recent shock activity?

P. Sonnentrucker (Johns Hopkins University), E. González-Alfonso (Universidad de Alcala de Henares, Spain), D.A. Neufeld (Johns Hopkins University), G.J. Melnick (Harvard Smithsonian Center for Astrophysics), E.A. Bergin (University of Michigan), W.J. Forrest, D.M. Watson, J.D. Green (University of Rochester), R. Gutermuth (Harvard Smithsonian Center for Astrophysics), K.H. Kim, J.L. Pipher (University of Rochester)

Using the Infrared Spectrograph (IRS) onboard the Spitzer Space Telescope, we have obtained the first maps of the distribution of both gas-phase CO2 emission (14.98 microns) and CO2 ice absorption (15.2 microns) toward the star-forming region Cepheus A East. We will discuss the relative importance of the various excitation mechanisms capable of producing this gaseous CO2 emission. We will use the CO2 abundances we derived both in the gas phase and the solid phase to discuss whether shocks might have played an important role in determining the CO2 chemistry toward this particular star-forming region.

P.S acknowledges support from grant NAG5-13114. This work is based [in part] on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by NASA.

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