Carbon Monoxide in the Cassiopeia A Supernova Remnant

Details Carbon Monoxide in the Cassiopeia A Supernova Remnant Carbon Monoxide in the Cassiopeia A Supernova Remnant

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341201r&link_type=abstract

American Astronomical Society, AAS Meeting #213, #412.01; Bulletin of the American Astronomical Society, Vol. 41, p.217

Astronomy and Astrophysics

Astronomy

Scientific paper

We report the near-infrared detection of first overtone Carbon Monoxide (CO) emission from the young supernova remnant Cassiopeia A. The presence of CO emission implies conditions are conducive to dust formation long after the typically quoted 200--800 days from the explosion event. The CO in Cas A formed in an earlier stage of SNe explosion and has cooled, is now visible in the infrared due to heating from the reverse shock. We present the first map of the CO distribution in the ejecta of a supernova remnant by subtracting the continuum emission from the CO filter map. We compare the first overtone CO emission with SN1987A and find 30 times less CO. The mass of CO in Cas A is at least 1E-6 Msun. Our CO detection suggests that molecule mixing is small in the SN ejecta and during the development of reverse shock. Detection of the CO overtone band in Cas A demonstrates that astrochemical processes and molecule formation continue more than 300 years after the initial explosion.

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