Multiwavelength Observations of the Ultraluminous X-ray Sources in NGC 1313

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The nearby (3.7 Mpc) late-type barred spiral galaxy NGC 1313 contains three ultraluminous X-ray sources (ULXs) that are offset from the center of the galaxy. Two of these have been associated with optical ionized nebulae, and their spectral and variability properties indicate that they contain black holes. The third ULX is SN 1978K, which was the second supernova to be detected and recognized as a supernova from its radio emission, and the first from its X-rays. Here we discuss the results of our program of X-ray (XMM-Newton), optical (VLT), and radio (ATCA) observations of these and the other sources in NGC 1313. Of particular interest is the long- and short-term spectral and temporal evolution of the sources.
This work has been supported by NASA grants NNG04GC64G and NNG04G100G.

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