(Proposal ID) S13A-057

(PI) Sobral, David

(Proposal Title)
Completing Subar-HiZELS: a uniquely matched H alpha & [O II] survey at z=1.5

(Abstract)
With the Hi-Redshift(z) Emission Line Survey (HiZELS) we have found thousands 
of distant sources with strong emission lines (mostly H alpha) redshifted into 
the JHK bands using existing and custom-made narrow-band filters. In the H 
band, we found 1000s of potential H alpha emitters at z=1.47 which can be 
easily confirmed/rejected using the perfectly suited S-Cam's NB921 filter to 
detect [O II]. This is the most efficient method of robustly selecting these 
z=1.47 line emitters, and significantly more effective and complete than 
spectroscopy. The large (>1000), clean (contamination < 3%) and complete 
(> 97%) samples obtained with the NB921 data (spread over a wide range of 
environments and properties) will finally allow us to: 1) robustly measure the 
clustering of z=1.47 SF galaxies as a function of SFR, luminosity, [O II]/H 
alpha and mass for the first time, 2) unveil fundamental inter-dependencies 
between mass, environment, H alpha/[O II] ratios and H alpha or [O II] 
luminosity at z ~ 1.5, comparing those with the results at z ~ 0 and without 
depending on the complex (and hard to model) selection function from 
spectroscopic surveys and 3) calibrate [O II] as a star-formation indicator 
at z ~ 1.5.