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

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Sep 25, 2022 548 likes •622 views

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

SLIDE 1

Intro GRAVITY Torus

Black hole variability: from Galactic center to microquasars

Frédéric VINCENT1

1Centrum Astronomiczne M. Kopernika, Warsaw, Poland 1/30 Frédéric VINCENT Black hole variability

SLIDE 2

Intro GRAVITY Torus

1

Variability: Sgr A*, microquasars

2

Constraining Sgr A* flare models with GRAVITY

3

Modeling microquasars QPOs: oscillating torus model

4

Conclusion

2/30 Frédéric VINCENT Black hole variability

SLIDE 3

Intro GRAVITY Torus

S2 S1 S4 S8 S9 S12 S13 S14 S17 S21 S24 S31 S33 S27 S29 S5 S6 S19 S18 S38 0.4 0.2 0. 0.2 0.4 0.4 0.2 0. 0.2 0.4 R.A. " Dec "

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 4.3 106 M⊙, θapp ≈ 50 µas

3/30 Frédéric VINCENT Black hole variability

SLIDE 4

Intro GRAVITY Torus Credit M. Weiss

Accretion structure Accretion disk / torus? Radiation from Sgr A* originates there

4/30 Frédéric VINCENT Black hole variability

SLIDE 5

Intro GRAVITY Torus

Microquasar

Credit R. Hynes

The central dark mass Central BH ≈ 10 M⊙, θapp ≈ 10−5 µas

5/30 Frédéric VINCENT Black hole variability