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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20150324T123000
DTEND;TZID=Atlantic/Canary:20150324T133000
UID:iactalks-768
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/768
CREATED:2015-03-24T12:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Dusting off the star formation history of AGN hosts with SHARDS
DESCRIPTION:Dusting off the star formation history of AGN hosts with SHARDS
 \nDr. Antonio Hernán-Caballero\n\nRecent works show that the restframe co
 lours of X-ray selected AGN host galaxies at z~1 are no different from tho
 se of inactive galaxies once stellar mass selection effects are taken into
  account. However, there is a clear deficit of AGN among quiescent galaxie
 s, and the average star formation rates of AGN hosts are comparable or hig
 her than those of inactive star-forming galaxies. These apparently contrad
 ictory findings could be a consequence of higher extinction in star-formin
 g AGN hosts compensating for their younger stellar populations in observed
  colours. In this talk I will present a new method of extinction correctio
 n that breaks the degeneracy with stellar age and metallicity by comparing
  the restframe U-V colour with measurements of the Dn(4000) index on inter
 mediate band photospectra from SHARDS. I'll show that the distribution of 
 extinction corrected U-V colours and Dn(4000) for AGN hosts at z<1 is s
 ignificantly different from that of comparison samples of inactive galaxie
 s, with a clear deficit of AGN in intrinsic red galaxies and a higher prev
 alence among those with intermediate age stellar populations.
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