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Monthly Notices of the Royal Astronomical Society 387 (2008) 1707-1711
Weighing the black holes in ultraluminous X-ray sources through timing
P. Casella, G. Ponti1, 2, A. Patruno, T. Belloni3, G. Miniutti1, 4, L. Zampieri

We describe a new method to estimate the mass of black holes in Ultraluminous X-ray Sources (ULXs). The method is based on the recently discovered 'variability plane', populated by Galactic stellar-mass black-hole candidates (BHCs) and supermassive active galactic nuclei (AGNs), in the parameter space defined by the black-hole mass, accretion rate and characteristic frequency. We apply this method to the two ULXs from which low-frequency quasi-periodic oscillations have been discovered, M82 X-1 and NGC 5408 X-1. For both sources we obtain a black-hole mass in the range 100-1300Msolar, thus providing evidence for these two sources to host an intermediate-mass black hole.
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
2 :  Dipartimemto di Astronomia, Universita degli Studi di Bologna
3 :  Osservatorio Astronomico di Brera
4 :  Institute of Astronomy
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique
accretion – accretion discs – black hole physics – X-rays: binaries – X-rays: individual: M82 X-1 – X-rays: individual: NGC 5408 X-1
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