A ``Pandora box'' of Galaxies

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Scientific paper

We present XMM-Newton observations of three high X-ray luminosity ``normal'' galaxies:MS1204.1+2826 (NGC4104), MS1143.6+2040 (NGC3884) and MS1309.1+3208. These objects are part of a flux limited sample of 8 high X-ray luminosity galaxies from the Einstein Medium Sensitivity Survey. In addition to these three objects, three others in the sample have already been observed by XMM-Newton and Chandra. We will present the details of our new observations and analysis and compare the properties of these objects with the rest of the sample and with the high Xray luminosity normal galaxies in the deep surveys. The observations were done with the aim of confirming that high X-ray luminosity normal galaxies discovered in deep XMM-Newton and Chandra survey and classified as new classes of exotic objects were already present in earlier and much brighter samples, and that this ``unusual'' populations appearing at low X-ray fluxes are actually the low-flux counterparts of the nearby and X-ray bright ``galaxies'' that have been known for two decades. The data we will present are confirming this view. }

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