Galaxies are a significant constituent of the structure of the universe. Most galaxies host supermassive black holes (SMBHs) at the center and show tight correlations between the bulge stellar mass and BH mass, which have been observed even at high redshift (z ∼ 6). How they formed and grew in such a short time from the Big Bang is still an open question. Quasar-driven massive outflows extending on galactic scales were detected in significant fractions of quasars. Recently, a large CIV BAL fraction of 40-47 % was reported for 30 high-z luminous quasars, which is ∼ 2.4 times higher than measured in the low-z universe. Here, we propose near-infrared spectroscopy of seven HSC-based, high-z low-luminosity (SHELLQs) quasars using Subaru/MOIRCS. Our immediate goals are to measure the CIV BAL fraction and investigate their BAL properties (i.e., outflow velocities, kinetic energy, and spectral properties compared with low-z BAL quasars). The proposed systematic BAL observations will provide a significant insight to whether BH outflows contribute to putative AGN feedback in the early universe, and also to the evolutionary sequence of the galaxies hosting high-z and low-luminosity quasars, which may be at least partially driven by the outflows.
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