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

2009-01-15

arxiv.org/abs/0901.2308v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Accepted for the publication in ApJ Letter

Scientific paper

10.1088/0004-637X/693/1/L39

We report the likely detection of near-infrared 2.29 $\mu$m first overtone Carbon Monoxide (CO) emission from the young supernova 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 $\sim$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 years after the initial explosion.

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