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combinedxnuv

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combinedxnuv

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  1. A combined Ultraviolet and X-ray colour image of the LINER galaxy M81 taken with the XMM-Newton Optical Monitor and X-ray Telescopes. The image covers a region approximately one quarter of a degree on a side. The ultra-violet image is formed from three 1000s second exposures taken in different filters that are centred on approximately 2000, 2300 and 2800 angstroms respectively. The coolest regions (those that are bright in the longest wavelength UV filter are shown blue, while the hotter regions (which are bright in the short wavelength UV filters) are green. The more energetic hotter X-ray regions were imaged by the X-ray MOS cameras which are sensitive to radiation in the 0.3-10keV range. These are shown in red. The point-like LINER nucleus, seen at the centre of the galactic bulge, is thought to be a 'mini-quasar' accreting gas at a very low rate. The spiral arms of the galaxy are traced out by hot, star-forming regions which are bright in the shorter wavelength ultraviolet bands. The predominantly blue-coloured point-like objects are foreground stars in our own Galaxy. Data courtesy of Alice Breeveld, Keith Mason (MSSL) and the XMM-RGS consortium led by A. Brinkman (SRON).

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