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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20120224T000000
DTEND;TZID=Atlantic/Canary:20120224T010000
UID:iactalks-377
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/377
CREATED:2012-02-24T00:00:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:A large, multi-epoch H-alpha survey at z=2.23, 1.47, 0.84 & 0.40: t
 he 11Gyr evolution of star-forming galaxies from HiZELS
DESCRIPTION:A large, multi-epoch H-alpha survey at z=2.23, 1.47, 0.84 & 0.4
 0: the 11Gyr evolution of star-forming galaxies from HiZELS\nDr. David Sob
 ral\n\nI will present new deep and wide narrow-band surveys undertaken wit
 h UKIRT, Subaru and the VLT; a unique combined effort to select large, rob
 ust samples of H-alpha (Ha) emitters at z=0.40, 0.84, 1.47 and 2.23 (corre
 sponding to look-back times of 4.2, 7.0, 9.2 and 10.6 Gyrs) in a uniform m
 anner over ~2 sqdeg in the COSMOS and UDS fields. The deep multi-epoch Ha 
 surveys are sensitive to Milky-Way SFRs out to z=2.2 for the first time, w
 hile the wide area and the coverage over two independent fields allows to 
 greatly overcome cosmic variance. A total of over 600 sources per epoch ar
 e homogeneously selected. Overall, the evolution seen in Ha is in good agr
 eement with the evolution seen using inhomogeneous compilations of other t
 racers of star formation, such as FIR and UV, jointly pointing towards the
  bulk of the evolution in the last 11 Gyrs being driven by a strong lumino
 sity/SFR increase from z~0 to z~2.2. Our uniform analysis allows to derive
  the Ha star formation history of the Universe, for which a simple time-pa
 rametrisation is a good approximation for the last 11Gyrs. Both the shape 
 and normalisation of the Ha star formation history are consistent with the
  measurements of the stellar mass density growth, confirming that our Ha a
 nalysis traces the bulk of the formation of stars in the Universe up to z~
 2.2. We are also exploring the large, multi-epoch and homogeneously select
 ed samples of Ha emitters to conduct detailed morphology, dust, clustering
 , environment and mass studies which are providing us with a unique view o
 n the evolution of star-forming galaxies and what has been driving it for 
 the past 11 Gyrs.
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