(Proposal ID) S15B-010

(PI) Imanishi, Masatoshi

(Proposal Title)
QSO feedback to low mass galaxy formation at high redshift

(Abstract)
We propose S-Cam NB711 (7120Angstrom) and broad-band deep imaging observations 
of the fields around multiple QSOs at z =4.84-4.88, to investigate the spatial 
distribution of Lyman alpha emitters (LAEs), the representative sample of low 
stellar mass galaxies, at z =4.83-4.89. The precise redshift determination of 
these QSOs, based on near-infrared spectroscopy, and the narrow wavelength 
coverage of the NB711 filter (72Angstrom in FWHM),  first enable us to select 
LAEs within the zone strongly affected by QSO's UV radiation (<a few physical 
Mpc; hereafter QSO's proximity), with minimum contamination from physically 
unrelated foreground and background galaxies toward the same line-of-sight. 
The large field of view of S-Cam (34'x 27') simultaneously covers LAEs at the 
same redshift in general blank fields, with much larger area than possible 
clustering scale, so that any different properties of LAEs inside and outside 
the QSO's proximity can be scrutinized in a reliable manner. Using these 
datasets, we will be able to quantitatively tackle the observationally 
unexplored topic of whether and how QSO's UV radiation gives feedback and 
suppresses the formation of neighboring low mass galaxies. This proposal is 
a continuation from our accepted program (S14B-006) to complete this project 
before S-Cam decommission.