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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 1 J.M. Miller C. Reynolds
1 APC - AHE - APC - Astrophysique des Hautes Energies
APC (UMR_7164) - AstroParticule et Cosmologie, Dipartimento di Astronomia, Universita degli Studi di Bologna
Abstract : 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.
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http://hal.in2p3.fr/in2p3-00330485
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Submitted on : Tuesday, October 14, 2008 - 3:35:23 PM
Last modification on : Saturday, September 19, 2020 - 4:51:20 AM

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R.C. Reis, A.C. Fabian, R.R. Ross, G. Miniutti, J.M. Miller, et al.. A systematic look at the very high and low/hard state of GX339-4: constraining the black hole spin with a new reflection model. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2008, 387, pp.1489-1498. ⟨10.1111/j.1365-2966.2008.13358.x⟩. ⟨in2p3-00330485⟩

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