Observing Orbital Motion in Strongly Curved Spacetime
Institute of Physics, Silesian University in OpavaGabriel Török
CZ.1.07/2.3.00/20.0071 Synergy , GAČR 209/12/P740, 202/09/0772, SGS-01-2013, www.physics.cz
Observing Orbital Motion in Strongly Curved Spacetime :
Institute of Physics, Silesian University in OpavaGabriel Török
CZ.1.07/2.3.00/20.0071 Synergy , GAČR 209/12/P740, 202/09/0772, SGS-01-2010, www.physics.cz
Timing signatures of accretion disc inhomogeneities
Institute of Physics, Silesian University in OpavaGabriel Török
CZ.1.07/2.3.00/20.0071 Synergy , GAČR 209/12/P740, 202/09/0772, SGS-01-2013, www.physics.cz
COLLABORATION:
Pavel Bakala, Didier Barret, Vladimír Karas, Michal Dovčiak, Martin Wildner, Dalibor Wzientek, Marek Abramowicz, Luigi Stella, Eva Šrámková, Kateřina Goluchová, Frederic Vincent, Grzegorz Mazur, Tomáš Pecháček
Global EmpiricalModel of Variabilityand Spectra (GRS 1915+105, SPL State)
Response Matrices(Detector)
“DATA” Time and Spectral Distributionof Detected Counts
TIMINGANALYSIS
RESULTS
TOTA
L SO
URC
E FL
UX
MO
DEL
+
Comparing different orbital QPO models, RXTE and LOFT
QPO MODEL
I. Small spots moving along slightly eccentric orbits close ISCO
I. Small spots moving along slightly eccentric orbits close ISCO
Left: RXTE Right: LOFT
POW
ER
POW
ER
II. Toy models of double peak QPOs assuming preferred orbits
II. Toy models of double peak QPOs assuming preferred orbits
Left: RXTE Right: LOFT
POW
ER
III. Elongated spots with LOFT
[LO
FT Y
ELLO
W B
OO
K]
CONCLUSIONS
Ad SMALL SPOTS:The LOFT observations could easily reveal the Keplerian frequency together with its first and second harmonics when the strongest (but still very weak) single signal is around the limits of the RXTE detectability.
Ad ELONGATED SPOTS:The LOFT mission could open a window to observe the epicyclic motion.
Ad SPOT vs. TORUS COMPARISON:We conclude that the ability to recognize the harmonic content of the signal and follow the QPO evolution can help to distinguish between the different proposed physical models.