CXOU J013651.1+154547: An Extremely Variable ULX in M74

Details CXOU J013651.1+154547: An Extremely Variable ULX in M74 CXOU J013651.1+154547: An Extremely Variable ULX in M74

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.1736k&link_type=abstract

American Astronomical Society, HEAD meeting #7, #17.36; Bulletin of the American Astronomical Society, Vol. 35, p.630

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Scientific paper

We present an investigation into a newly discovered ultraluminous X-ray source (ULX) in M74, CXOU J013651.1+154547. It varies in luminosity by more than an order of magnitude (from 5 x 1038 to 1 x 1040 erg s-1) in only 30 minutes, and flares on a characteristic timescale of around 4000 s. It has neither a radio nor optical counterpart, which suggests that it resides in M74 and is not a background AGN. It most closely resembles Galactic microquasars, in particular GRS 1915+105, in its temporal variability and spectral components. However, CXOU J013651.1+154547 resides near several prominent OB associations, suggesting that it may be associated with recent star formation. We discuss the spectral, spatial, and temporal characteristics of this intriguing source in the context of known Galactic sources as well as other ULXs.

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