BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Evidence for Gaseous Halos Around AGN at Cosmic Noon from ALMA CO(
 3-2) Observations - Gareth Jones (Cavendish Lab)
DTSTART:20220202T134500Z
DTEND:20220202T141500Z
UID:TALK169271@talks.cam.ac.uk
CONTACT:Hannah Uebler
DESCRIPTION:Gaseous outflows are key phenomena in the evolution of galaxie
 s\, as they affect star formation (either positively or negatively)\, ejec
 t gas from the core or disk\, and directly cause mixing of pristine and pr
 ocessed material. Active outflows may be detected through searches for low
 -level\, broad spectral line emission\, but it is also possible to determi
 ne the presence of past outflows by examining the current brightness distr
 ibution of galaxies. In this work\, we examine the CO(3-2) emission of a s
 et of z=2.0-2.5 AGN host galaxies (a subset of the SUPER sample)\, as obse
 rved with ALMA. By performing a three-dimensional stacking analysis\, coll
 apsing the resulting stacked cubes\, and extracting radial brightness prof
 iles\, we find evidence for a gaseous halo of r=15kpc. This is verified by
  creating a model of one or two 2D Gaussian models\, convolving them with 
 the stacked PSF\, and using the Bayesian inference code MultiNest to fit t
 he Gaussian properties so that the extracted brightness profiles are match
 ed. We extend this analysis to the HST/ACS i-band images of the SUPER samp
 le\, which show a complex small-scale (r lower than 5kpc) morphology but n
 o evidence for an extended halo. Thus\, the CO(3-2) data for the SUPER AGN
 s represents one of the best cases of gaseous halos at cosmic noon.
LOCATION:The Hoyle Lecture Theatre + Zoom 
END:VEVENT
END:VCALENDAR