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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20130124T103000
DTEND;TZID=Atlantic/Canary:20130124T113000
UID:iactalks-464
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/464
CREATED:2013-01-24T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Star formation on kpc-scales from redshift 0.1 to 1.5
DESCRIPTION:Star formation on kpc-scales from redshift 0.1 to 1.5\nDr. Emil
 y Wisnioski\n\nMorphologies of star-forming galaxies at z>1 are typical
 ly irregular  containing a handful of dominant bright regions. Recent obse
 rvational  evidence suggest that many of these galaxies are governed by di
 sc-like  rotation. Using Halpha galaxy kinematics from OSIRIS+LGSAO we fin
 d that  within z~1 turbulent discs star-forming regions have average sizes
  of  1.5 kpc and average Jeans masses of 4.2x10^9 \Msun, in total accounti
 ng  for 20-30% of the stellar mass of the discs. These findings lend  obse
 rvational support to models that predict larger star-forming regions  will
  form as a result of higher disc velocity dispersions driven-up by  cosmol
 ogical gas accretion.  As a consequence of the changes in global  env
 ironment, it may be predicted that star-forming regions at high  redshift 
 should not resemble star-forming regions locally. Yet despite  the increas
 ed sizes and dispersions, high-z star-forming regions and HII  regions are
  found to follow tight scaling relations over the range  z=0-2 for Halpha 
 size, velocity dispersion, luminosity and mass when  comparing >2000 HI
 I regions locally and 30 regions at z>1.  While  the turbulence of
  discs may have important implications for the size and  luminosity of reg
 ions which form within them, the same processes likely  govern their forma
 tion from high redshift to the current epoch. We are  now able to test thi
 s conclusion with first results from a new sample of  z=0.1-0.2 highly sta
 r-forming turbulent galaxies from the Sloan Digital  Sky Survey.
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