Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-06-22
Astronomy and Astrophysics
Astrophysics
6 pages, 5 figures, accepted for publication in A&A. Color PDF file ftp://astro.estec.esa.nl/pub/sciproj/fbocchin_h2804.pdf. C
Scientific paper
10.1051/0004-6361:20010882
\xmm ~observations of the X-ray feature 1SAX J0617.1+2221 in the IC443 supernova remnant are reported.We resolve the structure of the nebula into a compact core with a hard spectrum of photon index $\gamma= 1.63^{+0.11}_{-0.10}$ in the 2--10 keV energy range. The nebula also has an extended ($\sim 8\arcmin \times 5\arcmin$) X-ray halo, much larger than the radio emission extension. The photon index softens, following a linear scaling with distance from the centroid, similar to other known X-ray plerions. The index range is compatible with synchrotron burn-off models. All the observational evidence points toward a confirmation of the plerionic nature of the nebula, as recently suggested by a \ch observation, but with characteristics more similar to "non Crab-like" plerions. We discuss the implications on the synchrotron nebula magnetic field if the $>100$ MeV emission reported by {\it CGRO EGRET} is produced by the synchrotron emission. We also constrain the thermal emission of the central object, arguing that the surface temperature should be around 0.1 keV, although other possible fits cannot be excluded on the base of the \xmm data
Bocchino Fabrizio.
Bykov Andrei M.
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