Detection of Pure Rotational H 2 Emission from the Supernova Remnant IC 443: Further Evidence for a Partially Dissociating J-Shock

Details Detection of Pure Rotational H 2 Emission from the Supernova Remnant IC 443: Further Evidence for a Partially Dissociating J-Shock Detection of Pure Rotational H 2 Emission from the Supernova Remnant IC 443: Further Evidence for a Partially Dissociating J-Shock

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...449l..83r&link_type=abstract

Astrophysical Journal Letters v.449, p.L83

Astronomy and Astrophysics

Astronomy

13

Infrared: Ism: Lines And Bands, Ism: Molecules, Shock Waves, Ism: Supernova Remnants

Scientific paper

We present the first observation of the pure rotational 0--0 S(2) line of H2, at 12.28 mu m, from the supernova remnant IC 443. In combination with near infrared observations, the pure rotational emission effectively differentiates between broad classes of shock model. A J-shock, in which H2 is partially dissociated, propagating into gas with H2 density of 4 x 103 cm-3 provides a good fit to the observed H2 level populations but cannot be reconciled with the shock velocity inferred from H2 line profiles. The relative H2 level population in IC 443 and Orion Peak 1, discovered to be essentially identical for upper state energies E/k > 6000 K by Richter, Graham, and Wright, is identical for the 0--0 S(2) line at E/k = 1681.6 K, suggesting that the underlying nature of the two shocks as traced by H2 observations is identical.

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