Rho, J. and Jarrett, T. H. and Reach, W. T. and Gomez, H. and Andersen, M. (2009) Carbon Monoxide in the Cassiopeia a Supernova Remnant. Astrophysical Journal Letters, 693 (1). L39-L43. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20091002-140700145
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We report the likely detection of near-infrared 2.29 μm first overtone carbon monoxide (CO) emission from the young supernova (SN) remnant Cassiopeia A (Cas A). The continuum-subtracted CO filter map reveals CO knots within the ejecta-rich reverse shock. We compare the first overtone CO emission with that found in the well studied supernova SN 1987A and find ~30 times less CO in Cas A. The presence of CO suggests that molecule mixing is small in the SN ejecta and that astrochemical processes and molecule formation may continue at least ~ 300 yr after the initial explosion.
|Additional Information:||© 2009. The American Astronomical Society. Received 2008 October 8; accepted 2009 January 14; published 2009 February 16. We are grateful to Achim Tappe who participated in the Palomar observing run, and thank Takashi Onaka for fruitful discussion on dust and CO formation. We also thank Palomar Observatory staff (Jean Mueller, Jeff Hickey, and Karl Dunscombe) for assistance during our observing runs.We thank the anonymous referee for careful reading and helpful comments. H. Gomez would like to thank Las Cumbres Observatory for its support. M. Andersen is partially supported byNASA through LTSA grant NRA-01-01-LTSA-013. Based on observations obtained at the Hale Telescope, Palomar Observatory, as part of a continuing collaboration between the California Institute of Technology, NASA/JPL, and Cornell University.|
|Subject Keywords:||dust, extinction; ISM: molecules; supernova remnants; supernovae: general|
|Official Citation:||Carbon Monoxide in the Cassiopeia a Supernova Remnant J. Rho, T. H. Jarrett, W. T. Reach, H. Gomez, and M. Andersen 2009 ApJ 693 L39-L43 doi: 10.1088/0004-637X/693/1/L39|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||02 Oct 2009 23:31|
|Last Modified:||26 Dec 2012 11:26|
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