S18B0119abst
S18B0119
We propose deep FOCAS spectroscopy for very bright and rare dropout galaxy candidates at z ∼ 7 found in early data products of the Subaru strategic program with Hyper Suprime-Cam (HSC SSP). The survey area is ∼ 320 deg2, which is more than 180 times larger than previous work. From the HSC SSP data, we select very bright z ∼ 7 dropout galaxy candidates with −24.5 <∼ MUV <∼ −23.5 mag. Our bright z ∼ 7 candidates are more luminous than the spectroscopically confirmed galaxies at similar redshifts by more than 1 mag. Since we have completed all the screenings possible with the imaging data, the next step is to test the candidates with spectroscopy. Following our initial successful short service observations, we propose this normal program of FOCAS spectroscopy. Our FOCAS observations will enable us to spectroscopically confirm very bright z ∼ 7 galaxies and to obtain the first reliable measurements of the z ∼ 7 UV luminosity functions at the unexplored bright magnitude range. By addressing the question whether the bright end of the LF has an exponential cut off or not, we will discuss galaxy formation and its relation with AGNs at this epoch.
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