A systematic look at the very high and low/hard state of GX339-4: constraining the black hole spin with a new reflection model

R.C. Reis; A.C. Fabian; R.R. Ross; G. Miniutti; J.M. Miller; C. Reynolds

HAL : in2p3-00330485, version 1

arXiv : 0804.0238

Code Bibliographique ADS : 2008MNRAS.387.1489R

DOI : 10.1111/j.1365-2966.2008.13358.x

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Monthly Notices of the Royal Astronomical Society 387 (2008) 1489-1498

A systematic look at the very high and low/hard state of GX339-4: constraining the black hole spin with a new reflection model

R.C. Reis, A.C. Fabian, R.R. Ross, G. Miniutti¹, J.M. Miller, C. Reynolds

(2008)

We present a systematic study of GX 339-4 in both its very high and low hard states from simultaneous observations made with XMM-Newton and RXTE in 2002 and 2004. The X-ray spectra of both these extreme states exhibit strong reflection signatures, with a broad, skewed Fe-Kalpha line clearly visible above the continuum. Using a newly developed, self-consistent reflection model which implicitly includes the blackbody radiation of the disc as well as the effect of Comptonisation, blurred with a relativistic line function, we were able to infer the spin parameter of GX 339-4 to be 0.935 +/- 0.01 (statistical) +/- 0.01 (systematic) at 90 per cent confidence. We find that both states are consistent with an ionised thin accretion disc extending to the innermost stable circular orbit around the rapidly spinning black hole.

1 :	APC - AstroParticule et Cosmologie

équipe(s) de recherche : APC - AHE

Thème(s)

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

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

Lien vers le texte intégral :

http://fr.arXiv.org/abs/0804.0238


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