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| - On the compact nature of the most luminous ULX in the Cartwheel ring
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| - We report the first detection of flux variability in the most luminous X-ray source in the southern ring of the Cartwheel galaxy. XMM-Newton data show that the luminosity has varied over a time-scale of 6 months from L0.5−10 keV∼ 1.3 × 1041 erg s−1, consistent with the previous Chandra observation, to L0.5−10 keV≲ 6.4 × 1040 erg s−1. This fact provides the first evidence that the source is compact in nature and is not a collection of individual fainter sources, such as supernova remnants. The source has been repeatedly observed at the very high-luminosity level of L0.5−10 keV∼ 1.3 × 1041 erg s−1 for a period of at least 4 yr before dimming at the current level. It represents then the first example of an accreting object revealed in a long-lived state of extremely high luminosity.
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