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

Published online by Cambridge University Press:  21 February 2013

M. D. Caballero-Garcia ,
S. E. Motta ,
T. M. Belloni  and
A. Wolter
M. D. Caballero-Garcia
Affiliation:
INAF-Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate (LC)Italy email: [email protected]
S. E. Motta
Affiliation:
INAF-Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate (LC)Italy email: [email protected]
T. M. Belloni
Affiliation:
INAF-Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate (LC)Italy email: [email protected]
A. Wolter
Affiliation:
INAF, Osservatorio Astronomico di Brera, via Brera 28, 20121 MilanoItaly
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Abstract

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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.

Keywords

Accretionaccretion disksX-rays: binariesX-rays: generalX-rays: NGC 5408 X-1
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S290: Feeding Compact Objects: Accretion on All Scales , August 2012 , pp. 13 - 16
Copyright
Copyright © International Astronomical Union 2013

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