Search Publications
Cosmology from cosmic shear power spectra with Subaru Hyper Suprime-Cam first-year data
Strauss, Michael A.; Wang, Shiang-Yu; Sifón, Cristóbal +34 more
We measure cosmic weak lensing shear power spectra with the Subaru Hyper Suprime-Cam (HSC) survey first-year shear catalog covering 137 deg2 of the sky. Thanks to the high effective galaxy number density of ∼17 arcmin-2, even after conservative cuts such as a magnitude cut of i < 24.5 and photometric redshift cut of 0.3 ≤ …
Second data release of the Hyper Suprime-Cam Subaru Strategic Program
Ono, Yoshiaki; Ouchi, Masami; Harikane, Yuichi +62 more
This paper presents the second data release of the Hyper Suprime-Cam Subaru Strategic Program, a wide-field optical imaging survey using the 8.2 m Subaru Telescope. The release includes data from 174 nights of observation through 2018 January. The Wide layer data cover about 300 deg^2 in all five broad-band filters (grizy) to the nominal survey ex…
Big Three Dragons: A z = 7.15 Lyman-break galaxy detected in [O III] 88 µm, [C II] 158 µm, and dust continuum with ALMA
Ono, Yoshiaki; Ouchi, Masami; Harikane, Yuichi +18 more
We present new ALMA observations and physical properties of a Lyman break galaxy at z = 7.15. Our target, B14-65666, has a bright ultra-violet (UV) absolute magnitude, MUV ≈ -22.4, and has been spectroscopically identified in Lyα with a small rest-frame equivalent width of ≈4 Å. A previous Hubble Space TElescope (HST) image has shown th…
Achievements of Hinode in the first eleven years
Solanki, Sami K.; Tiwari, Sanjiv K.; Reeves, Katharine K. +33 more
Hinode is Japan's third solar mission following Hinotori (1981-1982) and Yohkoh (1991-2001): it was launched on 2006 September 22 and is in operation currently. Hinode carries three instruments: the Solar Optical Telescope, the X-Ray Telescope, and the EUV Imaging Spectrometer. These instruments were built under international collaboration with th…
AKARI/IRC near-infrared asteroid spectroscopic survey: AcuA-spec
Hasegawa, Sunao; Onaka, Takashi; Usui, Fumihiko +1 more
Knowledge of water in the solar system is important for the understanding of a wide range of evolutionary processes and the thermal history of the solar system. To explore the existence of water in the solar system, it is indispensable to investigate hydrated minerals and/or water ice on asteroids. These water-related materials show absorption fea…
Boötes. IV. A new Milky Way satellite discovered in the Subaru Hyper Suprime-Cam Survey and implications for the missing satellite problem
Strauss, Michael A.; Wang, Shiang-Yu; Ishigaki, Miho N. +13 more
We report on the discovery of a new Milky Way (MW) satellite in Boötes based on data from the ongoing Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP). This satellite, named Boötes IV, is the third ultra-faint dwarf that we have discovered in the HSC-SSP. We have identified a statistically significant (32.3σ) overdensity of stars with charac…
Environmental impacts on molecular gas in protocluster galaxies at z ∼ 2
Tamura, Yoichi; Kohno, Kotaro; Suzuki, Tomoko L. +12 more
We present the results from ALMA CO(3-2) observations of 66 Hα-selected galaxies in three protoclusters around radio galaxies: PKS 1138-262 (z = 2.16), USS 1558-003 (z = 2.53), and 4C 23.56 (z = 2.49). The pointing areas have an overdensity of ∼100 compared to the mean surface number density of galaxies in field environments. We detect the CO emis…
Detections of [O III] 88 µm in two quasars in the reionization epoch
Inoue, Akio K.; Hashimoto, Takuya; Tamura, Yoichi +3 more
We report on detections with the Atacama Large Millimeter/sub-millimeter Array of the far-infrared [O III] 88 µm line and the underlying dust continuum in two quasars in the reionization epoch, J205406.48-000514.8 (hereafter J2054-0005) at z = 6.0391 ± 0.0002 and J231038.88+185519.7 (hereafter J2310+1855) at z = 6.0035 ± 0.0007. The [O III] …
Three Z Camelopardalis-type dwarf novae exhibiting IW Andromedae-type phenomenon
Kato, Taichi
I found that V507 Cyg, IM Eri, and FY Vul are Z Cam-type dwarf novae and they showed sequences of standstill terminated by brightening, in contrast to fading as ordinary Z Cam stars do, followed by damping oscillation. These sequences are characteristic to IW And-type objects (also known as anomalous Z Cam stars). New additions to the IW And-type …
CO multi-line imaging of nearby galaxies (COMING). IV. Overview of the project
Nakanishi, Hiroyuki; Seta, Masumichi; Salak, Dragan +36 more
Observations of the molecular gas in galaxies are vital to understand the evolution and star-forming histories of galaxies. However, galaxies with molecular gas maps of their whole discs at sufficient resolution to distinguish galactic structures are severely lacking. Millimeter-wavelength studies at a high angular resolution across multiple lines…