31 citations · 122 across the 20 of their papers we have counts for
21 papers
Formation of Parallel Stellar Streams through Encounters with Dark Matter Subhalos and Intermediate-Mass Black Holes
Yuka Kaneda, Masao Mori, Yohei Miki +2
Dark matter subhalos and intermediate-mass black holes wandering in the Milky Way and the Andromeda galaxy are difficult to directly detect through electromagnetic observations, ye…
Galactic Archaeology with the Subaru `Ōnohi`ula Prime Focus Spectrograph Strategic Program
Masashi Chiba, Rosemary F. G. Wyse, Evan N. Kirby +48
The recently commissioned Subaru `Ōnohi`ula Prime Focus Spectrograph (PFS) will obtain spectra from nearly 2,400 fibers that cover 1.24 square degrees. The 360 night Subaru Strateg…
Subaru/HSC NB395 view of NGC 5466: metallicity, mass function, and the nature of its tidal stream
Itsuki Ogami, Miho N. Ishigaki, Pete B. Kuzma +6
We present a deep photometric study of the globular cluster NGC 5466 and its tidal stream using Subaru/Hyper Suprime-Cam (HSC) imaging with the metallicity-sensitive narrowband fil…
A High Incidence of Mid-infrared Variability in Local Ultraluminous Infrared Galaxies
Shun Hatano, Masatoshi Imanishi, Takanobu Kirihara +3
We explore mid-infrared (MIR) variability in local ultraluminous infrared galaxies (ULIRGs; infrared luminsoity ) utilizing the 11 years of photo…
Constructing a Pristine View of Extended Globular Cluster Structure
Pete B. Kuzma, Miho N. Ishigaki, Takanobu Kirihara +1
Globular Clusters (GCs) displaying extended structures are becoming increasingly ubiquitous in the Milky Way (MW). Despite their low surface brightness, which makes disentangling t…
Tidal Debris Candidates from the Centauri Accretion Event and its Role in Building Up the Milky Way Halo
Borja Anguiano, Arik Mitschang, Takanobu Kirihara +11
We identify stellar tidal debris from the Centauri ( Cen) system among field stars in the APOGEE survey via chemical tagging using a neural network trained on APOGEE observa…
Simultaneous Formation of the Andromeda Giant Southern Stream and the Substructures in the Andromeda Halo
Misa Yamaguchi, Masao Mori, Takanobu Kirihara +4
We investigate a minor merger event in M31 that simultaneously forms the Andromeda Giant Southern Stream (AGSS), Eastern Extent (EE), North-Eastern Shelf (NES), and Western Shel (W…
Triangulum IV: A Possible Ultra-Diffuse Satellite of M33
Itsuki Ogami, Yutaka Komiyama, Masashi Chiba +8
We report the detection of a dwarf satellite candidate (Triangulum IV: Tri IV) of the Triangulum galaxy (M33) using the deep imaging of Subaru/Hyper Suprime-Cam (HSC). From the app…
Cosmic Himalayas: The Highest Quasar Density Peak Identified in a 10,000 deg Sky with Spatial Discrepancies between Galaxies, Quasars, and IGM HI
Yongming Liang, Masami Ouchi, Dongsheng Sun +27
We report the identification of a quasar overdensity in the BOSSJ0210 field, dubbed Cosmic Himalayas, consisting of 11 quasars at , the densest overdensity of quasars…
Detection of a Spatially Extended Stellar Population in M33: A Shallow Stellar Halo?
Itsuki Ogami, Yutaka Komiyama, Masashi Chiba +8
We analyze the outer regions of M33, beyond 15 kpc in projected distance from its center using Subaru/HSC multi-color imaging. We identify Red Giant Branch (RGB) stars and Red Clum…
Galaxy Morphologies Revealed with Subaru HSC and Super-Resolution Techniques II: Environmental Dependence of Galaxy Mergers at z~2-5
Takatoshi Shibuya, Yohito Ito, Kenta Asai +8
We super-resolve the seeing-limited Subaru Hyper Suprime-Cam (HSC) images for 32,187 galaxies at z~2-5 in three techniques, namely, the classical Richardson-Lucy (RL) point spread…
The structure of the stellar halo of the Andromeda galaxy explored with the NB515 for Subaru/HSC. I.: New Insights on the stellar halo up to 120 kpc
Itsuki Ogami, Mikito Tanaka, Yutaka Komiyama +16
We analyse the M31 halo and its substructure within a projected radius of 120 kpc using a combination of Subaru/HSC and CFHT/MegaCam - \& -…
Merger Conditions of Population III Protostar Binaries
Takanobu Kirihara, Hajime Susa, Takashi Hosokawa +1
Massive close binary stars with extremely small separations have been observed, and they are possible progenitors of gravitational-wave sources. The evolution of massive binaries i…
Discrimination of heavy elements originating from Pop III stars in z = 3 intergalactic medium
Takanobu Kirihara, Kenji Hasegawa, Masayuki Umemura +2
We investigate the distribution of metals in the cosmological volume at , in particular, provided by massive population III (Pop III) stars using a cosmological -body si…
Effect of interstellar objects on metallicity of low-mass first stars formed in a cosmological model
Takanobu Kirihara, Ataru Tanikawa, Tomoaki Ishiyama
We investigate metal pollution onto the surface of low-mass population III stars (Pop. III survivors) via interstellar objects floating in the Galactic interstellar medium. Only re…
Statistical properties of substructures around Milky Way-sized haloes and their implications for the formation of stellar streams
Yu Morinaga, Tomoaki Ishiyama, Takanobu Kirihara +1
Stellar streams originating in disrupted dwarf galaxies and star clusters are observed around the Milky Way and nearby galaxies. Such substructures are the important tracers that r…
Stellar Stream and Halo Structure in the Andromeda Galaxy From a Subaru/Hyper Suprime-Cam Survey
Yutaka Komiyama, Masashi Chiba, Mikito Tanaka +13
We present wide and deep photometry of the northwest part of the halo of the Andromeda galaxy (M31) using Hyper Suprime-Cam on the Subaru Telescope. The survey covers 9.2 deg…
The nature of the progenitor of the M31 North-western stream: globular clusters as milestones of its orbit
Takanobu Kirihara, Yohei Miki, Masao Mori
We examine the nature, possible orbits and physical properties of the progenitor of the North-western stellar stream (NWS) in the halo of the Andromeda galaxy (M31). The progenitor…
Formation of the Andromeda Giant Stream: Asymmetric Structure and Disc Progenitor
Takanobu Kirihara, Yohei Miki, Masao Mori +2
We focus on the evidence of a past minor merger discovered in the halo of the Andromeda galaxy (M31). Previous N-body studies have enjoyed moderate success in producing the observe…
Puzzling Outer-Density Profile of the Dark Matter Halo in the Andromeda Galaxy
Takanobu Kirihara, Yohei Miki, Masao Mori
The cold dark matter (CDM) cosmology, which is the standard theory of the structure formation in the universe, predicts that the outer density profile of dark matter halos decrease…
Resolving the outer density profile of dark matter halo in Andromeda galaxy
Takanobu Kirihara, Yohei Miki, Masao Mori
Large-scale faint structure detected by the recent observations in the halo of the Andromeda galaxy (M31) provides an attractive window to explore the structure of outer cold dark…