8-12 July 2019
Cité des Congrès
Europe/Paris timezone

Modeling quiescent and flaring states of Sgr A*

8 Jul 2019, 18:00
30m
Salle J (Cité des Congrès)

Salle J

Cité des Congrès

Speaker

Frederic Vincent (Observatoire de Paris / LESIA)

Description

The Galactic center black hole Sgr A is known to exhibit regularly flares of radiation, during which Sgr A flux gets brighter by a factor of up to ~10 with respect to the quiescence. The physical origin of these flares is thus far only weakly constrained.

In this talk, I will present a new model for the quiescent state of Sgr A, based on the superimposition of a thick torus and a large-scale jet. This model allows to account for spectral and VLBI data from the radio to the infrared. I will also discuss a model for Sgr A flares based on the trigerring of a Rossby-wave instability in the accretion flow surrounding the black hole. I will discuss how GRAVITY data can help determine what model is correct.

Choix de session parallèle 1.1 Les diverses facettes du centre galactique : des abords du trou noir à son environnement plus lointain.

Primary author

Frederic Vincent (Observatoire de Paris / LESIA)

Presentation Materials