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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20120712T103000
DTEND;TZID=Atlantic/Canary:20120712T113000
UID:iactalks-402
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/402
CREATED:2012-07-12T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:A deeper look on thick discs using data from the Spitzer Survey of 
 Stellar Structure in Galaxies (S4G) 
DESCRIPTION:A deeper look on thick discs using data from the Spitzer Survey
  of Stellar Structure in Galaxies (S4G) \nDr. Sébastien Comerón\n\nThick
  discs are disc-like components with a scale height larger than  that of t
 he classical discs. They are  most easily detected in close to  edge-
 on galaxies in which they appear as a roughly exponential excess of  light
  which appears a few thin disc scale heights above the midplane.  Their or
 igin has been considered mysterious until recently and several  formation 
 theories have been proposed. Unveiling the origin of thick  discs is impor
 tant for understanding galaxy evolutionary processes. I will review the re
 sults we obtained on thick discs using data from the S4G: 1) Thick discs a
 re ubiquitous. 2) Thick discs are much more massive than previously though
 t. This  advocates for an in situ origin of thick discs at high redshift a
 nd for  them being a reservoir of missing baryons. 3) The superposition of
  thin and thick discs with different scale  lengths is the reason of at le
 ast half of disc antitruncations.
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