Deep XMM-Newton observation of a northern LMC field I. Selected X-ray sources.pdf

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Deep XMM-Newton observation of a northern LMC field I. Selected X-ray sources.pdf

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Deep XMM-Newton observation of a northern LMC field I. Selected X-ray sources

a r X i v : a s t r o - p h / 0 2 1 2 3 1 9 v 1 1 3 D e c 2 0 0 2 Astronomy Astrophysics manuscript no. (will be inserted by hand later) Deep XMM-Newton observation of a northern LMC field: I. Selected X-ray sources ? F. Haberl, K. Dennerl, and W. Pietsch Max-Planck-Institut fu?r extraterrestrische Physik, Giessenbachstra?e, 85748 Garching, Germany Received; accepted Abstract. First results from a deep XMM-Newton observation of a field in the Large Magellanic Cloud (LMC) near the north- ern rim of the supergiant shell LMC 4 are presented. Spectral and temporal analyses of a sample of selected X-ray sources yielded two new candidates for supernova remnants, a supersoft X-ray source and a likely high mass X-ray binary (HMXB) pulsar. From the fourteen brightest sources up to ten are active galactic nuclei in the background of the galaxy which can be used as probes for the interstellar medium in the LMC. From the three previously known HMXBs the Be/X-ray binary EXO 053109-6609.2 was the brightest source in the field, allowing a more detailed analysis of its X-ray spectrum and pulse profile. During the pulse EXO 053109-6609.2 shows eclipses of the X-ray emitting areas with increased photo-electric absorp- tion before and after the eclipse. The detection of X-ray pulsations with a period of 69.2 s is confirmed for RX J0529.8-6556 and a possible period of 272 s is discovered from XMMU J053011.2-655122. The results are discussed with respect to individual sources as well as in the view of source population studies in the vicinity of the supergiant shell LMC 4. Key words. galaxies: individual: LMC – ISM: supernova remnants – quasars: general – X-rays: galaxies – X-rays: stars – stars: neutron 1. Introduction Due to their proximity the Large and Small Magellanic Cloud (LMC, SMC) were always subject to X-ray surveys for satel- lites carrying imaging instruments. The most sensitive and most complete survey is available from ROSAT data obtained between 1990 and 1998 in the