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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20140213T123000
DTEND;TZID=Atlantic/Canary:20140213T133000
UID:iactalks-613
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/613
CREATED:2014-02-13T12:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:First results from the Hubble and Spitzer Frontier Fields - Pushing
  Hubble to its limits to study the early Universe 
DESCRIPTION:First results from the Hubble and Spitzer Frontier Fields - Pus
 hing Hubble to its limits to study the early Universe \nDr. Nicolas Laport
 e\n\nAt the end of 2013, the Hubble Space Telescope has started its last  
 flagship program : the "Frontier Fields". In the framework of this  projec
 t, three of the most powerful space telescopes to date - Hubble,  Spitzer 
 and Chandra - will dedicate a large amount of their observing  time to obs
 erve six galaxies clusters, who act as additional lenses and  amplify the 
 light from background sources, including very faint galaxies  to the edge 
 of the observable Universe. These images will reach a depth  comparable to
  the "Hubble Ultra Deep Field", but in a cluster field.  Abell 2744, the f
 irst Frontier Fields target, has been observed by HST  since November 1 an
 d the first release has been made public on December  17.  We have used th
 is dataset to search for Lyman Break galaxy (LBG) at   z>6.5 in the 4.9
  arcmin^2 field of view of the WFC3. Several sources  have been selected a
 nd the highest redshift object is estimated at z=8,  called Abell2744_Y1. 
 The amplification factor of this object is  relatively modest (mu=1.5). We
  used our own reduced Spitzer images at  3.6 and 4.5 microns to constrain 
 the Spectral Energy Distribution (SED)  of the z=8 galaxy candidate. We co
 mputed its properties by SED-fitting  using templates with and without neb
 ular emissions. The star formation  rate (SFR) in this galaxy ranges from 
 8 to 60Mo/yr, the stellar mass is  in the order of (2.5-10) x 10^9 Mo and 
 the size r=0.35+/-0.15 kpc, and  it is consistent with expectations and pr
 evious estimates in this range  of redshift. The brightness of this galaxy
  (F160W=26.2 AB) makes it one  of the brightest z=8 object to date, and co
 uld be observed by current  NIR-spectrograph in a reasonable amount of tim
 e.
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