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Article Dans Une Revue Chinese Journal of Astronomy and Astrophysics Année : 2005

A Simple Idea for the Changing Sign of the Lag in Microquasars

P. Varnière

Résumé

The phase lag structure between the hard and soft X-ray photons observed in GRS 1915+105 and XTE J1550+564 has been said to be ``complex'' because the phase of the Quasi-Periodic Oscillation fundamental Fourier mode changes with time and because the even and odd harmonics signs behave differently. From simultaneous X-ray and radio observations this seems to be related to the presence of a jet (level of radio emission). We propose a simple idea where a partial absorption of the signal can shift the phases of the Fourier modes and account for the phase lag reversal. We also briefly discuss a possible physical mechanism that could lead to such an absorption of the quasi-periodic oscillation modulation.
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hal-00398193 , version 1 (24-06-2009)

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  • HAL Id : hal-00398193 , version 1

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P. Varnière. A Simple Idea for the Changing Sign of the Lag in Microquasars. Chinese Journal of Astronomy and Astrophysics, 2005, pp.325-330. ⟨hal-00398193⟩
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