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SUMMARY:Probing the mass assembly of galaxies with ultra-deep imaging - Pi
 erre-Alain Duc (CEA-Saclay)
DTSTART:20151015T150000Z
DTEND:20151015T160000Z
UID:TALK61304@talks.cam.ac.uk
CONTACT:Simon Hodgkin
DESCRIPTION:The mass assembly of galaxies leaves various imprints in their
  surroundings\, such as shells\, streams\, tidal tails\, tidal dwarf galax
 ies\, extended stellar halos\, etc. The  frequency and properties  of thes
 e structures depend on the mechanism driving the mass assembly:  rapid col
 d-gas accretion followed by violent disk instabilities\, minor mergers or 
 major dry / wet mergers. Therefore by studying the outskirts of galaxies\,
  one  can learn about their main formation mechanism.\nI will present our 
 on-going work to characterize the external regions of about 400 massive ne
 arby  galaxies based  on ultra-deep  wide-field optical images obtained as
  part of the  MATLAS  and NGVS projects at the CFHT.  We use the diffuse l
 ight to extend outside the Local Group the technique of  galaxy archeology
  traditionally made with stellar counts.  Initial results pertain to the d
 iscovery of a wealth of low surface brightness structures\, including coll
 isional debris as well as unexpected blue star-forming disks around ellipt
 icals and red halos around spirals\, and to instructive correlations betwe
 en the level of tidal perturbation\, and the mass\, dynamical state and ga
 s content of the host galaxies. I will finally discuss the prospect of dee
 p optical imaging to not only study the structuration of galaxies\, but al
 so that of the interstellar medium.
LOCATION:Sackler Lecture Theatre\, IoA (tea at 3:30 pm)
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