A simple model for the complex lag structure of microquasars

Details A simple model for the complex lag structure of microquasars A simple model for the complex lag structure of microquasars

2005-02-14

arxiv.org/abs/astro-ph/0502267v1

Astronomy and Astrophysics

Astrophysics

accepted by A&A Letters

Scientific paper

10.1051/0004-6361:200500096

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 differentely. 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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