Volume 541, May 2012
|Number of page(s)||9|
|Section||Interstellar and circumstellar matter|
|Published online||22 May 2012|
A population of isolated hard X-ray sources near the supernova remnant Kes 69
INAF – Osservatorio Astronomico di Palermo, Piazza del Parlamento
2 A.F. Ioffe Institute for Physics and Technology, 194021 St. Petersburg, Russia
3 Department of Astronomy, Nanjing University, 210093 Nanjing, PR China
4 Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, PR China
5 St. Petersburg State Polytechnical University, 195251 St. Petersburg, Russia
6 Dipartimento di Fisica, Università di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
7 525 Davey Laboratory, Pennsylvania State University, University Park, PA 16802, USA
8 Purple Mountain Observatory, CAS, 2 West Beijing Road, 210008 Nanjing, PR China
Accepted: 5 April 2012
Recent X-ray observations of the supernova remnant (SNR) IC 443 interacting with molecular clouds detected a new population of hard X-ray sources related to the remnant itself, which has been proposed to be fast ejecta fragments propagating within the dense environment. Encouraged by these studies, we obtained a deep XMM-Newton observation of the SNR Kes 69, which also shows signs of a shock-cloud interaction. We report on the detection of 18 hard X-ray sources in the field of Kes 69, which is a number sognificantly higher than expected for the Galactic source population in the field. The sources are spatially correlated with CO emission from the cloud in the remnant environment. The spectra of 3 of the 18 sources can be described as hard power-laws with photon indices smaller than two plus line emission associated with K-shell transitions. We discuss the two most promising scenarios for the interpretation of the sources, namely fast ejecta fragments (as in IC 443) and cataclysmic variables. While most of the observational evidence is consistent with the former interpretation, we cannot rule out the latter.
Key words: ISM: supernova remnants / X-rays: ISM / ISM: individual objects: Kes 69
© ESO, 2012
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