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GREX-PLUS Science Book
PLUS Science Team, Akio K. Inoue, Yuichi Harikane +28
GREX-PLUS (Galaxy Reionization EXplorer and PLanetary Universe Spectrometer) is a mission candidate for a JAXA's strategic L-class mission to be launched in the 2030s. Its primary…
EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-Poor Galaxies: A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension
Akinori Matsumoto, Masami Ouchi, Kimihiko Nakajima +42
The primordial He abundance is a powerful probe of cosmology. Currently, is best determined by observations of metal-poor galaxies, while there are on…
Diffuse Lyman-alpha Halos around Galaxies at z=2.2-6.6: Implications for Galaxy Formation and Cosmic Reionization
Rieko Momose, Masami Ouchi, Kimihiko Nakajima +6
We present diffuse Lyman-alpha halos (LAHs) identified in the composite Subaru narrowband images of 100-3600 Lyman-alpha emitters (LAEs) at z=2.2, 3.1, 3.7, 5.7, and 6.6. First, we…
Accelerated Evolution of Ly Luminosity Function at Revealed by the Subaru Ultra-Deep Survey for Ly Emitters at
Akira Konno, Masami Ouchi, Yoshiaki Ono +8
We present the ultra-deep Subaru narrowband imaging survey for Lya emitters (LAEs) at in SXDS and COSMOS fields with a total integration time of 106 hours. Exploiting our n…
What is the Physical Origin of Strong Lya Emission? I. Demographics of Lya Emitter Structures
Takatoshi Shibuya, Masami Ouchi, Kimihiko Nakajima +5
We present the results of structure analyses for a large sample of 426 Lya emitters (LAEs) at z~2.2 that are observed with HST/ACS and WFC3-IR by deep extra-galactic legacy surveys…
What is the physical origin of strong Lya emission? II. Gas Kinematics and Distribution of Lya Emitters
Takatoshi Shibuya, Masami Ouchi, Kimihiko Nakajima +8
We present a statistical study of velocities of Lya, interstellar (IS) absorption, and nebular lines and gas covering fraction for Lya emitters (LAEs) at z~2. We make a sample of 2…
Ionization State of Inter-Stellar Medium in Galaxies: Evolution, SFR-M_star-Z Dependence, and Ionizing Photon Escape
Kimihiko Nakajima, Masami Ouchi
We present a systematic study for ionization state of inter-stellar medium in galaxies at z=0-3 with ~140,000 SDSS galaxies and 108 intermediate to high redshift galaxies from the…
First Systematic Search for Oxygen-Line Blobs at High Redshift: Uncovering AGN Feedback and Star-Formation Quenching
Suraphong Yuma, Masami Ouchi, Alyssa B. Drake +8
We present the first systematic search for extended metal-line [OII]λλ3726,3729 nebulae, or [OII] blobs (OIIBs), at z=1.2 using deep narrowband imaging with a survey volume of 1.9x…
First Spectroscopic Evidence for High Ionization State and Low Oxygen Abundance in Lya Emitters
Kimihiko Nakajima, Masami Ouchi, Kazuhiro Shimasaku +3
We present results from Keck/NIRSPEC and Magellan/MMIRS follow-up spectroscopy of Lya emitters (LAEs) at z=2.2 identified in our Subaru narrowband survey. We successfully detect Ha…
Gas Motion Study of Lya Emitters at z~2 Using UV and Optical Spectral Lines
Takuya Hashimoto, Masami Ouchi, Kazuhiro Shimasaku +5
We present the results of Magellan/MMIRS and Keck/NIRSPEC spectroscopy for five Lya emitters (LAEs) at z=2.2 for which high-resolution FUV spectra from Magellan/MagE are available.…
Spectroscopic Confirmation of Three z-Dropout Galaxies at z = 6.844 - 7.213: Demographics of Lyman-Alpha Emission in z ~ 7 Galaxies
Yoshiaki Ono, Masami Ouchi, Bahram Mobasher +10
We present the results of our ultra-deep Keck/DEIMOS spectroscopy of z-dropout galaxies in the SDF and GOODS-N. For 3 out of 11 objects, we detect an emission line at ~ 1um with a…
Average Metallicity and Star Formation Rate of Lya Emitters Probed by a Triple Narrow-Band Survey
Kimihiko Nakajima, Masami Ouchi, Kazuhiro Shimasaku +9
We present the average metallicity and star-formation rate of Lya emitters (LAEs) measured from our large-area survey with three narrow-band (NB) filters covering the Lya, [OII]372…
Detection of an ultra-bright submillimeter galaxy in the Subaru/XMM-Newton Deep Field using AzTEC/ASTE
S. Ikarashi, K. Kohno, J. E. Aguirre +40
We report the detection of an extremely bright (37 mJy at 1100 m and 91 mJy at 880 m) submillimeter galaxy (SMG), AzTEC-ASTE-SXDF1100.001 (hereafter referred to a…
Large Area Survey for z=7 Galaxies in SDF and GOODS-N: Implications for Galaxy Formation and Cosmic Reionization
Masami Ouchi, Bahram Mobasher, Kazuhiro Shimasaku +10
We present results of our large-area survey for z'-band dropout galaxies at z=7 in a 1568 arcmin^2 sky area covering the SDF and GOODS-N fields. Combining our ultra-deep Subaru/Sup…