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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20130423T123000
DTEND;TZID=Atlantic/Canary:20130423T133000
UID:iactalks-487
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/487
CREATED:2013-04-23T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Stellar haloes of disc galaxies at z~1
DESCRIPTION:Stellar haloes of disc galaxies at z~1\nDr. Ignacio Trujillo\n\
 nTaking advantage of the ultra-deep near-infrared imaging obtained with  t
 he Hubble Space Telescope on the Hubble Ultra Deep Field, we detect and  e
 xplore for the first time the properties of the stellar haloes of two  Mil
 ky Way-like galaxies at z~1. We find that the structural properties  of th
 ose haloes (size and shape) are similar to the ones found in the  local un
 iverse. However, these high-z stellar haloes are approximately  three magn
 itudes brighter and exhibit bluer colours ((g-r)<0.3 mag)  than their l
 ocal counterparts. The stellar populations of z~1 stellar  haloes are comp
 atible with having ages <1 Gyr. This implies that the  stars in those h
 aloes were formed basically at 1<z<2. This result  matches very well
  the theoretical predictions that locate most of the  formation of the ste
 llar haloes at those early epochs. A pure passive  evolutionary scenario, 
 where the stellar populations of our high-z  haloes simply fade to match t
 he stellar halo properties found in the  local universe, is consistent wit
 h our data.
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