Torus oscillations and the 17 minute QPO (IR flares in Sgr A* ) Wod - PowerPoint PPT Presentation

Torus oscillations and the 17 minute QPO (IR flares in Sgr A* ) Włod ek Kluźniak Copernicus Astronomical Center Aspen 2016.02.09

Sgr A* Genzel et al 2003 17m QPO

Appearance of black hole and disk (light-bending) J.-A. Marck

Size of BH binaries J. Orosz

Black hole GRO J 1655-40 Strohmayer et al 2001 450:300=3:2 Kluźniak & Abramowicz 2001 Twin high-frequency quasi-periodic oscillations HF QPOs X-ray observations

In GR, f~ 1 /M

e.g., WK 2005

B. Mishra

M. Bursa

Bursa et al. 2004

2006

Parthasarathy,Manousakis, WK, 2016 in press

Mishra + 2016

Blaes et al 2006

vertical lines: Radial, Vertical, +, X, Breathing PDS

17 minute QPO likely a counterpart of HF QPO in binary BH (450 Hz in GRO 1655-40) HF QPOs present in PDS of ray-traced GR simulations of tori. The modes have been identified. Which modes are present depends on the perturbation type. Radial perturbations yield two modes (R, +) in ~ 3:2 ratio Ditto for vertical perturbations (V, B) but only one pair ever seen in a given binary BH (to date?)

F. Vincent