514 citations · 570 across the 6 of their papers we have counts for
6 papers
What determines the HI gas content in galaxies?: morphological dependence of the HI gas fraction across M*-SFR plane
Shigeru V. Namiki, Yusei Koyama, Shuhei Koyama +5
We perform a stacking analysis of the HI spectra from the Arecibo Legacy Fast ALFA (ALFALFA) survey for optically-selected local galaxies from the Sloan Digital Sky Survey (SDSS) t…
Faint Quasars Live in the Same Number Density Environments as Lyman Break Galaxies at z ~ 4
Hisakazu Uchiyama, Masayuki Akiyama, Jun Toshikawa +16
Characterizing high-z quasar environments is key to understanding the co-evolution of quasars and the surrounding galaxies. To restrict their global picture, we statistically exami…
Second Data Release of the Hyper Suprime-Cam Subaru Strategic Program
Hiroaki Aihara, Yusra AlSayyad, Makoto Ando +62
This paper presents the second data release of the Hyper Suprime-Cam Subaru Strategic Program, a wide-field optical imaging survey on the 8.2 meter Subaru Telescope. The release in…
A spectroscopic study of a rich cluster at z=1.52 with Subaru LBT: the environmental impacts on the mass-metallicity relation
Shigeru V. Namiki, Yusei Koyama, Masao Hayashi +9
We present the results of our near-infrared (NIR) spectroscopic observations of a rich cluster candidate around a radio galaxy at (4C65.22) with Subaru/MOIRCS and LBT/LUCI…
Do Galaxy Morphologies Really Affect the Efficiency of Star Formation during the Phase of Galaxy Transition?
Shuhei Koyama, Yusei Koyama, Takuji Yamashita +11
Recent simulations predict that the presence of stellar bulge suppress the efficiency of star formation in early-type galaxies, and this `morphological quenching' scenario is suppo…
Suppression of Low-mass Galaxy Formation around Quasars at z~2-3
H. Uchiyama, N. Kashikawa, R. Overzier +7
We have carried out deep and wide field imaging observations with narrow bands targeting 11 quasar fields to systematically study the possible photoevaporation effect of quasar rad…