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We present simultaneous XMM-Newton UV and X-ray observations of the quadruplylensed quasar SDSS J1004+4112 (RBS 825). Simultaneously with the XMM-Newtonobservations we also performed integral field spectroscopy on the two closestlens images A and B using the Calar Alto PMAS spectrograph. In X-rays thewidely spaced components C and D are clearly resolved, while the closer pair ofimages A and B is marginally resolved in the XMM-EPIC images. The integratedX-ray flux of the system has decreased by a factor of 6 since it was observedin the ROSAT All Sky Survey in 1990, while the X-ray spectrum became muchharder with the power law index evolving from Gamma=-2.3 to -1.86. Bydeblending the X-ray images of the lensed QSO we find that the X-ray fluxratios between the lens images A and B are significantly different from thesimultaneously obtained UV ratios and previously measured optical flux ratios.Our optical spectrum of lens image A shows an enhancement in the blue emissionline wings, which has been observed in previous epochs as a transient feature.We propose a scenario where intrinsic UV and X-ray variability gives rise toline variations which are selectively magnified in image A by microlensing. Theextended emission of the lensing cluster of galaxies is clearly detected in theEPIC images, we measure a 0.5-2.0 keV luminosity of 1.4 E44 erg/s. Based on thecluster X-ray properties, we estimate a mass of 2-6 E14 solar masses.Comment: 11 pages, 10 figures, accepted for publication in Astronomy &  Astrophysic

Strange magnification pattern in the large separation lens SDSS J1004+4112 from optical to X-rays