HAL : in2p3-00330505, version 1

arXiv : 0804.3378

Code Bibliographique ADS : 2008MNRAS.387.1707C

DOI : 10.1111/J.1365-2966.2008.13372.X

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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

(07/2008)

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 - AstroParticule et Cosmologie
2 :	Dipartimemto di Astronomia, Universita degli Studi di Bologna
3 :	Osservatorio Astronomico di Brera
4 :	Institute of Astronomy

équipe(s) de recherche : APC - AHE

Thème(s)

:

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Mot(s)-clé(s) : 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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Contributeur : Simone Lantz <>

Soumis le : Mardi 14 Octobre 2008, 15:52:02

Dernière modification le : Vendredi 22 Juin 2012, 21:28:49