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CATEGORIES:Galaxies Discussion Group
SUMMARY:Using IFU data to disentangle the starburst-AGN co
 nnection - Rebecca Davies
DTSTART;TZID=Europe/London:20140704T113000
DTEND;TZID=Europe/London:20140704T123000
UID:TALK52826AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/52826
DESCRIPTION:The physical mechanisms driving the complex interp
 lay between star-formation and AGN activity in gal
 axies are poorly understood. Spatially resolved sp
 ectroscopy presents the potential to probe the rad
 ial variations in star formation rate\, stellar ag
 e and star-formation history\, and analyse how the
 se properties differ across the AGN host galaxy po
 pulation. However\, the\nmajority of integral fiel
 d unit (IFU) surveys are focused at visible wavele
 ngths\, where spectroscopic star-formation rate in
 dicators are strongly contaminated by AGN activity
 . In this talk\, I will show that IFU data allow s
 tar-forming and AGN-dominated regions to be resolv
 ed both spatially and spectrally in local AGN host
  galaxies. The presence of curved "starburst-AGN\n
 mixing sequences" on optical diagnostic diagrams a
 llows AGN fractions to be calculated on a spaxel-b
 y-spaxel basis. Both the star-formation and the AG
 N\ncontribute significantly to the global emission
  of [OIII]\, [OII] and Hbeta. We calculate theoret
 ical starburst-AGN mixing curves and show that the
 y are\nable to reproduce our observed mixing seque
 nces. We also present a new diagnostic for starbur
 st-AGN mixing which requires only the [OII] 3727\,
  3729\, [OIII] 5007 and Hbeta 4861 emission lines\
 , and can therefore be used to\ncalculate AGN frac
 tions up to redshifts as high as z \\sim 0.85 (opt
 ical) and z \\sim  3.5 (near infrared). We anticip
 ate that this diagnostic will facilitate\nstudies 
 of the relative optical contribution of star-forma
 tion and AGN activity over cosmic time.\n
LOCATION:Kavli LMR\, IoA
CONTACT:Sergey Koposov
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