XMM-Newton study of hard X-ray sources in IC 443

Free access article

Issue		A&A Volume 400, Number 1, March II 2003


Page(s)		203 - 211
Section		Formation, structure and evolution of stars
DOI		http://dx.doi.org/10.1051/0004-6361:20021858

A&A 400, 203-211 (2003)
DOI: 10.1051/0004-6361:20021858

XMM-Newton study of hard X-ray sources in IC 443

F. Bocchino¹ and A. M. Bykov²

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

(Received 20 August 2002 / Accepted 16 December 2002 )

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 ${\ga} 10^{-14}$ $\rm ~erg~cm^{-2}~s^{-1}$ . 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 $15^\prime\times 15^\prime$ region where there is strong 2.2 $\mu {\rm m}$ 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.

Key words: acceleration of particles -- radiation mechanisms: non-thermal -- ISM: clouds -- ISM: cosmic rays -- ISM: individual object: IC 443 -- ISM: supernova remnants

Offprint request: F. Bocchino, bocchino@astropa.unipa.it

SIMBAD Objects

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.