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The aperiodic variability of the Ultraluminous X-ray source in NGC 5408

  • M. D. Caballero-Garcia (a1), S. E. Motta (a1), T. M. Belloni (a1) and A. Wolter (a2)

Abstract

Ultra-Luminous X-ray sources are accreting black holes that might represent strong evidence of the Intermediate Mass Black Holes (IMBH), proposed to exist by theoretical studies but with no firm detection (as a class) so far. We analyze the best X-ray timing and spectral data from the ULX in NGC 5408 provided by XMM-Newton. The main goal is to study the broad-band noise variability of the source. We found an anti-correlation of the fractional root-mean square variability versus the intensity of the source, similar to black-hole binaries during hard states.

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Keywords

The aperiodic variability of the Ultraluminous X-ray source in NGC 5408

  • M. D. Caballero-Garcia (a1), S. E. Motta (a1), T. M. Belloni (a1) and A. Wolter (a2)

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