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

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

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005chjas...5..325v&link_type=abstract

Chinese Journal of Astronomy & Astrophysics, Vol. 5 Supplement, p. 325-330

Astronomy and Astrophysics

Astrophysics

X-Rays: Binaries, Stars: Individual (Grs 1915+105, Xte J1550-564), Accretion Disks

Scientific paper

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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