Hydrodynamic simulation that reproduces the distribution of stellar debris (ejecta) in the supernova remnant IC 443. The colored isosurface shows the ejecta distribution (density value at 1% of the peak density) approximately 8400 years after the supernova; the colors give the radial velocity in units of 1000 km/s on the isosurface. The outer transparent surface marks the position of the forward shock; the toroidal transparent purple structure represents a molecular cloud of the interstellar medium with which the remnant interacts. The transparent image passing through the center of the remnant is a wide field optical observation of the remnant. The inset box shows a composite optical (red, yellow) and X-ray (blue) observation of the pulsar wind nebula.

Reference: Ustamujic et al. 2021, A&A 649, id.A14

Image credit: Wide Field Optical: Bob Franke (Focal Pointe Observatory). Inset X-ray: D.Swartz et al (NASA/CXC/MSFC). Inset Optical: DSS, SARA