2005 Supplement: The Fifth Microquasar Workshop 2004 (1-364) / Varnière

A Simple Idea for the Changing Sign of the Lag inMicroquasars

P Varnière

Abstract

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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DOI: https://doi.org/10.1088/1009-9271/5/S1/325

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