"When Supermassive Black Holes are Too Greedy"
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.
When gas infalls to the center, the black hole swallows as much as possible, but it is limited.
infalling on the black hole liberates a considerable energy, radiation
and kinetic energy. The galaxy nucleus becomes active, either a Seyfert,
or a quasar. The winds and plasma jets emitted by the black hole, drag
the molecular gas around. So much mass is ejected that it can have a
large impact on the host galaxy, quenching the star formation.
The supermassive black holes, in rejecting their food, thus control the star formation rate in galaxies.
About Françoise Combes
Professor Françoise Combes is an astrophysicist at l’Observatoire de Paris, LERMA, France. Her research focus is on formation and evolution of galaxies. She has also contributed to various models of dark matter. Earlier this year she was elected Honorary member of the American Astronomical Society. Other recent accomplishments include being awarded Officer of the French Legion of Honour in 2015, which is the highest French order of merit for military and civil merits.
FB, lecture hall, Fysik Origo, Fysik
21 September, 2017, 15:15
21 September, 2017, 17:00