Testing slim-disk models on the thermal spectra of LMC X-3

Abstract

Slim-disk models describe accretion flows at high luminosities, while reducing to the standard thin disk form in the low luminosity limit. We have developed a new spectral model, slimbb, within the framework of XSPEC, which describes fully relativistic slim-disk accretion and includes photon ray-tracing that starts from the disk photosphere, rather than the equatorial plane. We demonstrate the features of this model by applying it to RXTE spectra of the persistent black-hole X-ray binary LMC X-3. LMC X-3 has the virtues of exhibiting large intensity variations while maintaining itself in soft spectral states which are well described using accretion-disk models, making it an ideal candidate to test the aptness of slimbb. Our results demonstrate consistency between the low-luminosity (thin-disk) and high luminosity (slim-disk) regimes. We also show that X-ray continuum-fitting in the high accretion rate regime can powerfully test black-hole accretion disk models.

6 pages, 5 figures, submitted to A&A

References in corpus (6)

• Testing Accretion Disk Theory in Black Hole X-ray Binaries
• Slim disks around Kerr black holes revisited
• A Grid of Relativistic, non-LTE Accretion Disk Models for Spectral Fitting of Black Hole Binaries
• Angular Momentum Transport in Accretion Disks and its Implications for Spin Estimates in Black Hole Binaries
• A Global Study of the Behaviour of Black Hole X-ray Binary Discs
• Photon Bubbles and the Vertical Structure of Accretion Disks

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