The aperiodic variability of the Ultraluminous X-ray source in NGC 5408
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.
- Publication:
-
Feeding Compact Objects: Accretion on All Scales
- Pub Date:
- February 2013
- DOI:
- 10.1017/S1743921312019102
- arXiv:
- arXiv:1210.3965
- Bibcode:
- 2013IAUS..290...13C
- Keywords:
-
- Accretion;
- accretion disks;
- X-rays: binaries;
- X-rays: general;
- X-rays: NGC 5408 X-1;
- Astrophysics - High Energy Astrophysical Phenomena;
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- Revised version. Proceedings of IAUS 290 "Feeding Compact Objects: Accretion on All Scales", C. M. Zhang, T. Belloni, M. Mendez &