The aperiodic variability of the Ultraluminous X-ray source in NGC 5408
High Energy Astrophysical Phenomena
2015-06-11 v2 Cosmology and Nongalactic Astrophysics
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.
Keywords
Cite
@article{arxiv.1210.3965,
title = {The aperiodic variability of the Ultraluminous X-ray source in NGC 5408},
author = {M. D. Caballero-Garcia and S. E. Motta and T. M. Belloni and A. Wolter},
journal= {arXiv preprint arXiv:1210.3965},
year = {2015}
}
Comments
Revised version. Proceedings of IAUS 290 "Feeding Compact Objects: Accretion on All Scales", C. M. Zhang, T. Belloni, M. Mendez & S. N. Zhang (eds.)