ELFT HÍRADÓ

[uhlar AT konkoly.hu (Karola_Uhlar)]

                                Meghívó
        az  MTA Konkoly Thege Miklós Csillagászati Kutatóintézete 
                        rendkívüli  szemináriumára

Elõadó: Gerard Williger (Université de Nice)

Cím: GALEX selected Lyman Break Galaxies at z~2: Comparison with other 
Populations

Kivonat: 
We present results of a search for bright Lyman break galaxies at 1.5 <= z 
<= 2.5 in the GOODS-S field using a NUV-dropout technique in combination 
with color-selection. We derived a sample of 73 LBG candidates. We compare 
our selection efficiencies to BM/BX- and BzK methods (techniques solely 
based on ground-based data sets), and find the NUV data to provide greater 
efficiency for selecting star-forming galaxies. We estimate LBG candidate 
ages, masses, star formation rates, and extinction from fitting PEGASE 
synthesis evolution models. We find about 20% of our LBG candidates are 
comparable to infrared luminous LBGs or sub-millimeter galaxies which are 
thought to be precursors of massive elliptical galaxies today. Overall, we 
can show that although BM/BX and BzK methods do identify star-forming 
galaxies at z~2, the sample they provide biases against those star-forming 
galaxies which are more massive and contain sizeable red stellar 
populations. A true Lyman break criterion at z~2 is therefore more 
directly comparable to the populations found at z~3, which does contain a 
red fraction. (arXiv:1112.2786)

Az elõadás idõpontja: 2012.  január 25., szerda  14 óra 

Helye: MTA CSFK CSI elõadóterme
Budapest, XII., Konkoly Thege M. út 15-17.