Gluttonous black holes

ESRF-ILL Joint Colloquia
Start Date
07-06-2019 14:00
End Date
07-06-2019 16:00
Auditorium, Central Building
Speaker's name
Fran├žoise Combes
Speaker's institute
Observatoire de Paris
Contact name
Fabienne Mengoni
Host name
P. Bruno & U. Koester
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The majority of galaxies host in their center a super-massive black hole of mass between one million and a few billion solar masses. The mass of the black hole is proportional to the bulge mass, which suggests a tight relation between star formation and black hole growth. The black hole feeds on the gas and stars of its neighborhood, but can not swallow more than a certain limit, called the Eddington rate.
Matter infalling on the black hole releases considerable energy, and the nucleus of the galaxy becomes active, either a Seyfert galaxy or a quasar. The winds and jets emitted by the nucleus drag the molecular gas around. The ejected mass is such that it can have a significant impact on the host galaxy, quenching star formation. Supermassive black holes, by rejecting their food, thus control the star formation rate in galaxies.

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