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

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

2011-05-31

arxiv.org/abs/1106.0009v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

6 pages, 5 figures, submitted to A&A

Scientific paper

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.

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