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Astron. Astrophys. 362, L29-L32 (2000)

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Letter to the Editor

Hard X-ray emission from IC443: evidence for a shocked molecular clump?

F. Bocchino 1,2 and A.M. Bykov 3

1 Astrophysics Division, Space Science Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
2 Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
3 A.F. Ioffe Institute for Physics and Technology, St. Petersburg, Russia, 194021

Received 17 August 2000 / Accepted 22 September 2000


We report BeppoSAX  observations of spatially resolved hard X-ray emission from IC 443, a supernova remnant interacting with a molecular cloud. The emission is shown to come from two localized features spatially correlated with bright molecular emission regions. Both hard X-ray features have soft X-ray counterparts, in one case shifted by [FORMULA] arcmin toward the remnant interior. The spectra of X-ray emission from both isolated features have photon index [FORMULA] in the MECS regime. The emission detected from the remnant with PDS detector extends up to 100 keV. We discuss the observed properties of the hard X-ray features in relation to non-thermal emission from shocked molecular clumps and pulsar wind nebula.

Key words: acceleration of particles – radiation mechanisms: non-thermal – ISM: clouds – ISM: cosmic rays – ISM: individual objects: IC443 – ISM: supernova remnants

Send offprint requests to: byk@astro.ioffe.rssi.ru

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© European Southern Observatory (ESO) 2000

Online publication: October 24, 2000