(Proposal ID) S14A-086

(PI) Sobral, David

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

(Abstract)
With HiZELS we have found thousands of distant sources with strong emission 
lines (mostly Halpha) redshifted into the JHK bands using existing and custom-
made narrow-band filters. In the H band, we found 1000s of potential Halpha 
emitters at z = 1.47, but in Lockman, BOOTES and ELAIS N1 the photo-zs are of 
very poor quality and do not allow us to distinguish Halpha from other 
emitters. Fortunately, all genuine z = 1.47 emitters can be easily confirmed/
rejected using the perfectly suited S-Cam's NB921 filter to detect [Oii]. This 
is by far the most efficient method of robustly selecting these z = 1.47 line 
emitters (Sobral et al. 2012), and significantly more 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, [Oii]/Halpha
 and mass, 2) unveil fundamental inter-dependencies between mass, environment, 
Halpha/[Oii] ratios and Halpha or [Oii] luminosity at z ~ 1.5, comparing those 
with the results at z ~ 0 and without depending on he complex selection 
function from spectroscopic surveys and 3) calibrate [Oii] as a star-formation 
indicator at z ~ 1.5.