2014ApJ...796..144K -
Astrophys. J., 796, 144 (2014/December-1)
Interaction between Cassiopeia A and nearby molecular clouds.
KILPATRICK C.D., BIEGING J.H. and RIEKE G.H.
Abstract (from CDS):
We present spectroscopy of the supernova remnant Cassiopeia A (Cas A) observed at infrared wavelengths from 10 to 40 µm with the Spitzer Space Telescope and at millimeter wavelengths in 12CO and 13CO J =2-1 (230 and 220 GHz) with the Heinrich Hertz Submillimeter Telescope. The IR spectra demonstrate high-velocity features toward a molecular cloud coincident with a region of bright radio continuum emission along the northern shock front of Cas A. The millimeter observations indicate that CO emission is broadened by a factor of two in some clouds toward Cas A, particularly to the south and west. We believe that these features trace interactions between the Cas A shock front and nearby molecular clouds. In addition, some of the molecular clouds that exhibit broadening in CO lie 1'-2' away from the furthest extent of the supernova remnant shock front. We propose that this material may be accelerated by ejecta with velocity significantly larger than the observed free-expansion velocity of the Cas A shock front. These observations may trace cloud interactions with fast-moving outflows such as the bipolar outflow along the southwest to northeast axis of the Cas A supernova remnant, as well as fast-moving knots seen emerging in other directions.
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Journal keyword(s):
infrared: ISM - ISM: individual: Cassiopeia A - ISM: molecules - ISM: supernova remnants - shock waves
Simbad objects:
7
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