Fabry-Pero image of shocked H2 emission in IC 443

Astronomy and Astrophysics – Astronomy

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Emission Spectra, Hydrogen, Infrared Astronomy, Supernova Remnants, Fabry-Perot Interferometers, Infrared Imagery, Interstellar Matter, Shock Waves

Scientific paper

We obtained an H2 1-0 S(1) image of the south-east ridge in the supernova remnant IC 443 by using a Fabry-Perot imager. The H2 emitting region was resolved into many clumps which has not been seen by previous observations with larger beams. The H2 image was compared with a 21-cm H I map in order to investigate the H2 excitation mechanism. Although the H2 emitting area roughly overlaps the H I area, no one-to-one correlation between the peaks of H2 and H I is found. This morphology indicates that although the H I 21-cm line is due to molecular dissociation by J-shocks, the H2 emission peaks are caused by C-shocks in dense clumps. Consequently, the coexistence of C-shocks and J-shocks is suggested to be present at the molecular ridge of IC 443.

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