Five ULXs in NGC 4631 show an anti-correlation between X-ray variability amplitude and luminosity, and a structure function that increases with timescale, mirroring AGN behavior.
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Spectral and timing analysis of NGC 4631 X-4 using Chandra, XMM-Newton and Swift data shows variability and spectral shapes supporting super-Eddington accretion onto a stellar-mass compact object without distinguishing neutron star from black hole.
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The X-ray Variability of the Ultraluminous X-ray Sources in the NGC 4631 galaxy
Five ULXs in NGC 4631 show an anti-correlation between X-ray variability amplitude and luminosity, and a structure function that increases with timescale, mirroring AGN behavior.
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Spectral and timing variability of the transient ultraluminous X-ray source NGC 4631 X-4
Spectral and timing analysis of NGC 4631 X-4 using Chandra, XMM-Newton and Swift data shows variability and spectral shapes supporting super-Eddington accretion onto a stellar-mass compact object without distinguishing neutron star from black hole.