BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Using IFU data to disentangle the starburst-AGN connection - Rebec
 ca Davies
DTSTART:20140704T103000Z
DTEND:20140704T113000Z
UID:TALK52826@talks.cam.ac.uk
CONTACT:Sergey Koposov
DESCRIPTION:The physical mechanisms driving the complex interplay between 
 star-formation and AGN activity in galaxies are poorly understood. Spatial
 ly resolved spectroscopy presents the potential to probe the radial variat
 ions in star formation rate\, stellar age and star-formation history\, and
  analyse how these properties differ across the AGN host galaxy population
 . However\, the\nmajority of integral field unit (IFU) surveys are focused
  at visible wavelengths\, where spectroscopic star-formation rate indicato
 rs are strongly contaminated by AGN activity. In this talk\, I will show t
 hat IFU data allow star-forming and AGN-dominated regions to be resolved b
 oth spatially and spectrally in local AGN host galaxies. The presence of c
 urved "starburst-AGN\nmixing sequences" on optical diagnostic diagrams all
 ows AGN fractions to be calculated on a spaxel-by-spaxel basis. Both the s
 tar-formation and the AGN\ncontribute significantly to the global emission
  of [OIII]\, [OII] and Hbeta. We calculate theoretical starburst-AGN mixin
 g curves and show that they are\nable to reproduce our observed mixing seq
 uences. We also present a new diagnostic for starburst-AGN mixing which re
 quires only the [OII] 3727\, 3729\, [OIII] 5007 and Hbeta 4861 emission li
 nes\, and can therefore be used to\ncalculate AGN fractions up to redshift
 s as high as z \\sim 0.85 (optical) and z \\sim  3.5 (near infrared). We a
 nticipate that this diagnostic will facilitate\nstudies of the relative op
 tical contribution of star-formation and AGN activity over cosmic time.\n
LOCATION:Kavli LMR\, IoA
END:VEVENT
END:VCALENDAR