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A Systematic Search of Distant Superclusters with the Subaru Hyper Suprime-Cam Survey
Tsung-Chi Chen, Yen-Ting Lin, Hsi-Yu Schive +13
Superclusters, encompassing environments across a wide range of overdensities, can be regarded as unique laboratories for studying galaxy evolution. Although numerous supercluster…
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…
Halo Concentration, Galaxy Red Fraction, and Gas Properties of Optically-defined Merging Clusters
Nobuhiro Okabe, Masamune Oguri, Hiroki Akamatsu +9
We present multi-wavelength studies of optically-defined merging clusters, based on the Hyper Suprime-Cam Subaru Strategic Program. Luminous red galaxies, tracing cluster mass dist…
Correlation between star formation activity and electron density of ionized gas at z=2.5
Rhythm Shimakawa, Tadayuki Kodama, Charles C. Steidel +7
In the redshift interval of , the physical conditions of the inter-stellar medium (ISM) in star-forming galaxies are likely to be different from those in the local Universe…
Mapping the large scale structure around a z=1.46 galaxy cluster in 3-D using two adjacent narrow-band filters
Masao Hayashi, Tadayuki Kodama, Yusei Koyama +7
We present a novel method to estimate accurate redshifts of star-forming galaxies by measuring the flux ratio of the same emission line observed through two adjacent narrow-band fi…