The Cartwheel ULXs peculiar behaviour

Details The Cartwheel ULXs peculiar behaviour The Cartwheel ULXs peculiar behaviour

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..924..747w&link_type=abstract

THE MULTICOLORED LANDSCAPE OF COMPACT OBJECTS AND THEIR EXPLOSIVE ORIGINS. AIP Conference Proceedings, Volume 924, pp. 747-750

Computer Science

X-Ray Sources, X-Ray Bursts, X-Ray Binaries, Black Holes

Scientific paper

Chandra observations of the Cartwheel galaxy reveal a population of ultraluminous X-ray sources (ULXs) associated with a spreading wave of star formation which began a few hundred million years ago. The brightest source in the Cartwheel, with a luminosity L0.5-10keV ~ 1.3 × 1041erg s-1, was observed in this state for at least four years, and is probably the brightest long-lived off-nuclear source ever seen in external galaxies. A recent XMM-Newton follow up observation allowed us to witness a dimming of this source by at least a factor of 2 over a timescale of six months. This has provided the first evidence that the source is compact in nature and is not resulting from the superposition of fainter individual objects such as supernova remnants. In its current level of emission, this source fits the X-ray Luminosity Function consistent with an association to High Mass X-ray binaries, but we cannot exclude the possibility that the source harbours an intermediate-mass black hole.

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