XMMU J134736.6+173403: the brightest ULX known?

Details XMMU J134736.6+173403: the brightest ULX known? XMMU J134736.6+173403: the brightest ULX known?

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008cxo..prop.2686j&link_type=abstract

Chandra proposal ID #10620402

Physics

Scientific paper

The X-ray source XMMU J134736.6+173403 has recently been discovered. Its X-ray position coincides with two interacting galaxies, one of which is a Seyfert II. The X-ray spectrum rules out an association with the Seyfert II. Carpano et al.(2008) suggest that the source is a foreground LMXB (unrelated to the galaxy-pair). Our optical photometry rule that out since the counterpart to the LMXB should have been detected. We find an extended source in the XMM error circle. Optical spectroscopy shows emission lines such as found in ULX nebulae. If this emission nebula is associated with the X-ray source it implies that it is the brightest known ULX. A 2 ks Chandra observation would provide the accurate source position necessary to assess if the nebula and the X-ray source are associated.

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