HI Observations and a Kinematic Model of the Large-scale Shocks in IC 443

Details HI Observations and a Kinematic Model of the Large-scale Shocks in IC 443 HI Observations and a Kinematic Model of the Large-scale Shocks in IC 443

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.7006w&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #70.06; Bulletin of the American Astronomical Society, Vol. 24, p.1232

Astronomy and Astrophysics

Astronomy

Scientific paper

We present data of the broad-line HI emission observed with the VLA and of serveral molecular species ((12) CO, (13) CO, HCO(+) , HCN, and CS) with the Nobeyama 45m telescope in the vicinity of Galactic supernova remnant IC 443. The strong shock is distributed in a ring on the near-side of the supernova bubble, and the atomic and molecular gas are well mixed at nearly all positions and velocities. The velocity profiles and line ratios are consistent with the suggestion that the shock consists of a mixture of J- and C-types, while CO as well as HCO(+) are optically thin at most positions. A comparison between atomic and molecular emission confirms that the HI is mainly from dissociating molecular gas. It also suggests a fragmentary structure of the shock layer. The large-scale kinematics of the shocked gas is simulated based on a simple relationship between the viewing angle, the observed line width and the shock velocity. Assuming a co-planar distribution of the dense preshock gas, and using HCO(+) as the main shock tracer, the model successfully reproduces the observed line parameters. It also uniquely determines the position and systemic velocity of the center of expansion, plus the orientation, mean radius, and mean expansin speed of the materials in the ring. Our observations and the model demonstrate that shocks can develop at quite different rates depending on the densities of the ambient ISM they encounter; and that several different shocks generated in the supernova remnant can simultaneously propagate in the highly inhomogeneous medium. The fact that most of the shocked molecular emission regions in IC 443 are co-planar implies a predominantly sheet-like structure of the preshock gas.

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