Fredagskollokvium: The circumgalactic medium in emission and absorption around distant massive galaxies

Carlos De Breuck, European Space Observatory (ESO), München.

portrettbildet av en smilende man med briller ut i natur
Dr. Carlos De Breuck, European Space Observatory (ESO), München.

The Circum Galactic Medium (CGM) is the extended reservoir of gas from which galaxies form. While it has a critical role for the formation of galaxies, it is rather difficult to observe given that the gas can extend far beyond the edges of the galaxy, resulting in rather faint emission signatures.

In my presentation, I will concentrate mostly on the CGM around high redshift radio galaxies, which are among the most massive and luminous galaxies known out to redshifts 5. We have detected the CGM in various tracers, both in emission and in absorption, mostly using the MUSE instrument on the ESO Very Large Telescope (VLT), and the Atacama Large Millimeter/submillimer Array (ALMA). Our observations show that the metal enriched gas is already quite widespread within their CGM, likely driven by AGN-driven outflows. The radio-loud AGN seems to trace a phase near the end of the main formation epoch of these massive galaxies.

colourful plots of gas around a radio galaxy
The density and velocity field of the absorbing Circum Galactic Medium gas around a radio galaxy at redshift 4.5. Credit: Wuji Wang. 

Please join via Zoom at

Meeting ID: 644 7137 5529
Passcode: 470176

Zoom attendees will be muted during the colloquium, but will have the opportunity to ask questions at the end by clicking on the "raise hand” button (or send a request to me via chat).

Emneord: institute seminar, fredagskollokvium, extragalactic astronomy, Observations
Publisert 15. sep. 2021 16:57 - Sist endret 20. sep. 2021 09:25