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SUMMARY:Super-massive black holes across cosmic time - Johannes Buchner (M
 PE)
DTSTART:20230915T103000Z
DTEND:20230915T113000Z
UID:TALK203329@talks.cam.ac.uk
CONTACT:Sandro Tacchella
DESCRIPTION:Black holes of millions to billion solar masses in the centres
  of nearby galaxies raise the question how and when these black holes were
  created. I will give an overview of some investigations of the origin\, g
 rowth and consequences of the presence of such black holes studied with X-
 ray surveys including from the new all-sky surveyor eROSITA and multi-wave
 length information. In understanding the host galaxies growing their black
  holes\, a on-going challenge is that light from Active Galactic Nuclei co
 ntaminates the emission of galaxies\, making the measurement of stellar ma
 sses and star-formation rates notoriously unreliable. Overly high masses w
 hen the AGN model is incomplete are typical. This prevents evolutionary te
 sts comparing black hole and host galaxy properties. Our group developed a
  novel data-driven benchmark data set where host galaxy masses and AGN pro
 perties are known\, and tested a variety of SED fitting codes to criticall
 y evaluate their ability to infer host galaxy properties. Finally\, we pre
 sent an unbiased SED fitting method\, GRAHSP\, Grasping Reliably the AGN H
 ost Stellar Population\, to test the evolution of supermassive black holes
  in the centres of galaxies.
LOCATION:Ryle seminar room + online
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