Black hole variability: from Galactic center to microquasars Frdric - PowerPoint PPT Presentation

Intro GRAVITY Torus Black hole variability: from Galactic center to microquasars Frédéric VINCENT 1 1 Centrum Astronomiczne M. Kopernika, Warsaw, Poland 1/30 Frédéric VINCENT Black hole variability

Intro GRAVITY Torus Variability: Sgr A*, microquasars 1 Constraining Sgr A* flare models with GRAVITY 2 Modeling microquasars QPOs: oscillating torus model 3 Conclusion 4 2/30 Frédéric VINCENT Black hole variability

Intro GRAVITY Torus S31 S19 0.4 S27 S12 S29 0.2 S5 S17 S2 S14 S6 S4 Dec � " � 0. S38 S21 � 0.2 S18 S13 S8 S1 S33 � 0.4 S9 S24 0.4 0.2 0. � 0.2 � 0.4 R.A. � " � S-stars cluster (Gillessen et al. 2009): size = 1 ” ≈ 0 . 05 pc Innermost Galactic center: Sgr A* Astrometric measurements of S-stars → central mass. Sgr A* ≈ SMBH of 4.3 10 6 M ⊙ , θ app ≈ 50 µ as 3/30 Frédéric VINCENT Black hole variability

Intro GRAVITY Torus Credit M. Weiss Accretion structure Accretion disk / torus? Radiation from Sgr A* originates there 4/30 Frédéric VINCENT Black hole variability

Intro GRAVITY Torus Microquasar Credit R. Hynes The central dark mass Central BH ≈ 10 M ⊙ , θ app ≈ 10 − 5 µ as 5/30 Frédéric VINCENT Black hole variability