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ISOCAM spectro-imaging of the H2 rotational lines in the supernova remnant IC 443 *
D. Cesarsky 1,
P. Cox 1,
G. Pineau des Forêts 2,
E.F. van Dishoeck 3,
F. Boulanger 1 and
C.M. Wright 4
Received 7 May 1999 / Accepted 23 June 1999
We report spectro-imaging observations of the bright western ridge of the supernova remnant IC 443 obtained with the ISOCAM circular variable filter (CVF) on board the Infrared Space Observatory (ISO) . This ridge corresponds to a location where the interaction between the blast wave of the supernova and ambient molecular gas is amongst the strongest. The CVF data show that the 5 to 14 µm spectrum is dominated by the pure rotational lines of molecular hydrogen (v = 0-0, S(2) to S(8) transitions). At all positions along the ridge, the H2 rotational lines are very strong with typical line fluxes of erg s- 1 cm-2 sr-1. We compare the data to a new time-dependent shock model; the rotational line fluxes in IC 443 are reproduced within factors of 2 for evolutionary times between 1,000 and 2,000 years with a shock velocity of and a pre-shock density of .
Key words: ISM: individual objects: IC 443 ISM: supernova remnants infrared: ISM: lines and bands shock waves
* Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with the participation of ISAS and NASA.
Send offprint requests to: P. Cox (firstname.lastname@example.org)
Online publication: August 13, 199