Issue |
A&A
Volume 400, Number 1, March II 2003
|
|
---|---|---|
Page(s) | 203 - 211 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20021858 | |
Published online | 24 February 2003 |
XMM-Newton study of hard X-ray sources in IC 443
1
INAF, Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
2
AF Ioffe Institute for Physics and Technology, St. Petersburg, 194021, Russia
Corresponding author: F. Bocchino, bocchino@astropa.unipa.it
Received:
20
August
2002
Accepted:
16
December
2002
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
. 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
region where there is
strong 2.2
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
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.
Key words: acceleration of particles / radiation mechanisms: non-thermal / ISM: clouds / ISM: cosmic rays / ISM: individual object: IC 443 / ISM: supernova remnants
© ESO, 2003
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