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Title:
XMM-Newton study of hard X-ray sources in IC 443
Authors:
Bocchino, F.; Bykov, A. M.
Affiliation:
AA(INAF, Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy), AB(AF Ioffe Institute for Physics and Technology, St. Petersburg, 194021, Russia)
Publication:
Astronomy and Astrophysics, v.400, p.203-211 (2003) (A&A Homepage)
Publication Date:
03/2003
Origin:
A&A
A&A Keywords:
acceleration of particles, radiation mechanisms: non-thermal, ISM: clouds, ISM: cosmic rays, ISM: individual object: IC 443, ISM: supernova remnants
DOI:
10.1051/0004-6361:20021858
Bibliographic Code:
2003A&A...400..203B

Abstract

We present XMM-Newton observations of hard X-ray emission from the field of IC 443, a supernova remnant interacting with a molecular cloud. The hard emission from the field is dominated by 12 isolated sources having 2-10 keV flux {ga } 10-14 erg cm-2 s-1. Only a fraction of the sources are expected to be extragalactic or stars on statistical grounds, while the others may be associated with the remnant. We have analyzed near-infrared K band and also DSS optical data for all of the detected sources, finding that six X-ray sources are located in a relatively small 15'x15' region where there is strong 2.2 mu m infrared emission, indicating interaction with a molecular cloud. The source 1SAX J0618.0+2227, the brightest in this region (excluding the plerion), is resolved with XMM-Newton into two sources, one of which is extended and has a hard power law spectrum photon index la 1.5) and shows some indications of spectral line signatures (e.g. Si), while the other is point-like and has a featureless spectrum of steeper photon index ~ 2.2. Possible interpretations of some of the discrete sources in terms of interaction between the SNR and the molecular cloud are discussed.
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