Peggy Varniere (University Paris 7, France)

One formalism for the three LFQPO types

In most microquasars, Low-Frequency Quasi-Periodic Oscillations (LFQPO) have been classified in three
types (A, B and C) but no explanation for the differences has been proposed yet. In 1999 the Accretion-
Ejection Instability (AEI) was presented as a possible explanation for the fast varying LFQPO. Since then, we
have expanded our model and we now look at a possible generalization to explain the characteristics of the
other types of LFQPO. Indeed, it was recently shown that when the disk approaches its last stable orbit, the
AEI is affected markedly by relativistic effects. Focusing on the characteristics of the Low-Frequency Quasi-
Periodic Oscillations that would result from the Relativistic Accretion-Ejection Instability we compare them
with the characteristics of different LFQPO types.