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Variabilité temporelle des binaires-X : observations avec INTEGRAL. Modélisation.

Abstract : The exact origin of the observed X and Gamma ray variability in X-ray binaries is still an open debate in high energy astrophysics. Among others, these objects are showing aperiodic and quasiperiodic luminosity variations on timescales as small as the millisecond. This erratic behavior must put constraints on the proposed emission processes occuring in the vicinity of the neutron star or the stellar mass black-hole held by these objects.

We propose here to study their behavior following 3 different ways: first we examine the evolution of a particular X-ray source discovered by INTEGRAL, IGR J19140+0951. Using timing and spectral data given by different instruments, we show that the source type is plausibly consistent with a High Mass X-ray Binary hosting a neutron star. Subsequently, we propose a new method dedicated to the study of timing data coming from coded mask aperture instruments. Using it on INTEGRAL/ISGRI real data, we detect the presence of periodic and quasi-periodic features in some pulsars and microquasars at energies as high as a hundred keV.

Finally, we suggest a model designed to describe the low frequency variability of X-ray binaries in their hardest state. This model is based on thermal comptonization of soft photons by a warm corona in which a pressure wave is propagating in cylindrical geometry. By computing both numerical simulations and analytical solution, we show that this model should be suitable to describe some of the typical features observed in X-ray binaries power spectra in their hard state and their evolution such as aperiodic noise and low frequency quasi-periodic oscillations.
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https://tel.archives-ouvertes.fr/tel-00161499
Contributor : Clément Cabanac <>
Submitted on : Tuesday, July 10, 2007 - 6:07:31 PM
Last modification on : Friday, November 6, 2020 - 4:02:41 AM
Long-term archiving on: : Thursday, April 8, 2010 - 10:54:43 PM

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  • HAL Id : tel-00161499, version 1

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Clément Cabanac. Variabilité temporelle des binaires-X : observations avec INTEGRAL. Modélisation.. Astrophysique [astro-ph]. Université Joseph-Fourier - Grenoble I, 2007. Français. ⟨tel-00161499⟩

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