XMM-Newton Detection of the Supernova Remnant G337.2+0.1

We report the first XMM detection of the SNR candidate G337.2+0.1 (=AXJ1635.9-4719). The object shows centrally filled and diffuse X-ray emission.The emission peaks in the hard 3.0-10.0 keV band. A spatially resolved spectralstudy confirms that the column density of the central part of the SNR is aboutN_{H}~5.9 +/- 1.5*10^{22} cm^{-2} and its X-ray spectrum is well represented bya single power-law with a photon index Gamma=0.96 +/- 0.56. The non-detectionof line emission in the central spectrum is consistent with synchrotronradiation from a population of relativistic electrons. Detailed spectralanalysis indicates that the outer region is highly absorbed and quite softerthan the inner region, with N_{H}~16.2(+/-5.2)*10^{22} cm^{-2} andkT=4.4(+/-2.8) keV. Such characteristics are already observed in other X-rayplerions. Based on the morphological and spectral X-ray information, we confirmthe SNR nature of G337.2+0.1, and suggest that the central region of the sourceis a pulsar wind nebula (PWN), originated by an energetic though yet undetectedpulsar, that is currently losing energy at a rate of ~ 10^{36} erg s^{-1}.Comment: 13 pages, 5 figures, Accepted for publication in Astrophysical Journal Letter