Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21831801r&link_type=abstract
American Astronomical Society, AAS Meeting #218, #318.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We report spectroscopic detection of carbon monoxide at 4.5 micron fundamental band from the young supernova remnant Cassiopeia A (Cas A). AKARI Infrared Camera (IRC) observations were made towards 4 positions where narrow-filter CO image at 2.29 micron infers plausible detection of CO molecules. Our IRC spectroscopy unambiguously revealed broad features of CO fundamental bands. The CO emission is detected from all of four positions which include northern shell and Minkowski knot and central unshocked ejecta. The spectra show two main peaks, but peaks vary position to position. We can reproduce the observed emission with optically thin CO emission at temperatures between 1500 and 2500 K and at radial velocities of -2000 km/s. We will present comparison of CO in Cas A with that detected in supernovae. Our observations address importance of molecule formation and Type II supernovae are indeed factories of molecules in early Universe. We will discuss CO formation processes and mass of CO, degree of CO destruction in ejecta, implication of mixing, evolution of carbon dust, molecule and dust formation in early Universe. Future SOFIA FLITECAM and FORCAST grism instruments cover near- and mid-infrared wavelengths with a high resolution spectroscopy and will allow us to advance our understanding of molecule and dust evolution in galaxies and the Milky Way.
Cami Jan
Onaka Takashi
Reach William
Rho Jeonghee
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