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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20130219T123000
DTEND;TZID=Atlantic/Canary:20130219T133000
UID:iactalks-470
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/470
CREATED:2013-02-19T12:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:The Evolution of quiescent galaxies at high-z: towards the high-mas
 s end of the GSMF
DESCRIPTION:The Evolution of quiescent galaxies at high-z: towards the high
 -mass end of the GSMF\nDr. Helena Domínguez Sánchez\n\nIn this talk we w
 ill show the evolution of high-redshift (z≥ 1.4) quiescent galaxies in 
 the COSMOS field. We have studied an IRAC (mag 3.6 μm  < 22.0) selec
 ted sample of ~ 18 000 galaxies at z≥ 1.4 in the COSMOS  field with mul
 tiwavelength coverage extending from the U band to the  Spitzer 24 μm o
 ne. We have derived accurate photometric redshifts and other  important ph
 ysical parameters [masses, ages and star formation rates  (SFR)] through a
  SED-fitting procedure. Galaxies have been divided  according to their sta
 r formation activity into actively  star-forming, intermediate and quiesce
 nt galaxies depending on their  specific star formation rate (sSFR = SFR/M
 ). The evolution of the Galaxy  Stellar Mass Funtion (GSMF) of the differe
 nt populations, in particular  of the quiescent galaxies, has been investi
 gated in detail. There is a  significant evolution of the quiescent stella
 r mass function from 2.5  < z < 3.0 to 1.4 < z < 1.6, increasi
 ng by ~1 dex in this  redshift interval. We find that z ~1.5 is an epoch o
 f transition of the  GSMF: while the GSMF at z≳ 1.5 is dominated by the 
 star-forming galaxies  at all stellar masses, at z≲ 1.5 the contribution
  to the total GSMF of  the quiescent galaxies is significant and becomes h
 igher than that of  the star-forming population for M≥ 1010.75 Msun. We
  derive the fraction of quiescent/star-forming galaxies with redshift, as 
 well as the stellar mass density. We  also compare our results with the pr
 edictions of theoretical models.  Finally, I will introduce my current pro
 ject: studying in deeper detail  the IRAC drop-outs of the sample with new
  nIR (ULTRA-VISTA) and fIR  (Herschel) data to elucidate between very dust
 -obscured objects or  high-z star forming galaxies, which could help us to
  put some constrains  to the high-mass end of the GSMF at high-z.
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