67 citations · 69 across the 17 of their papers we have counts for
17 papers
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…
A Long Stellar Stream in M83: Possible Connection Between XUV Disks and Minor Mergers?
Itsuki Ogami, Sakurako Okamoto, Annette M. N. Ferguson +5
We present the confirmation and characterization of a long stream (S-stream) in the southern part of M83. This feature is revealed using deep wide-field photometric data obtained b…
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…
Machine Learning Techniques to Distinguish Giant Stars from Dwarf Stars Using Only Photometry -- Pushing Redwards
Keyi Ding, Carrie Filion, Rosemary F. G. Wyse +6
We present our photometric method, which combines Subaru/HSC , g, and i band filters to distinguish giant stars in Local Group galaxies from Milky Way dwarf contamination. T…
The Extended Stellar Distribution in the Outskirts of the Ursa Minor Dwarf Spheroidal Galaxy
Kyosuke S. Sato, Sakurako Okamoto, Masafumi Yagi +7
We discover an extended distribution of main-sequence (MS) stars along the minor axis of the Ursa Minor (UMi) dwarf spheroidal galaxy (dSph). This study is enabled by deep, wide Su…
Estimating Fe and Mg Abundances in the Milky Way Dwarf Galaxies Using Subaru/HSC and DEIMOS
Jihye Hong, Evan N. Kirby, Tiffany M. Tang +5
We investigate the chemical abundance distributions of the Fornax, Sculptor, Ursa Minor, and Draco dwarf galaxies using Subaru/HSC photometric data. The HSC dataset, which includes…
The Star Formation and Chemical Evolution Histories of Ursa Minor Dwarf Spheroidal Galaxy
Kyosuke S. Sato, Yutaka Komiyama, Sakurako Okamoto +8
We derive the star formation history (SFH) and chemical evolution history (CEH) of the Ursa Minor (UMi) dwarf spheroidal galaxy (dSph). We detect two distinct stellar populations t…
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…
EMPRESS. X. Spatially resolved mass-metallicity relation in extremely metal-poor galaxies: evidence of episodic star-formation fueled by a metal-poor gas infall
Kimihiko Nakajima, Masami Ouchi, Yuki Isobe +47
Using the Subaru/FOCAS IFU capability, we examine the spatially resolved relationships between gas-phase metallicity, stellar mass, and star-formation rate surface densities (Sigma…
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…
Uncovering the Ghostly Remains of an Extremely Diffuse Satellite in the Remote Halo of NGC 253
Sakurako Okamoto, Annette M. N. Ferguson, Nobuo Arimoto +12
We present the discovery of NGC253-SNFC-dw1, a new satellite galaxy in the remote stellar halo of the Sculptor Group spiral, NGC 253. The system was revealed using deep resolved st…
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…
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 - \& -…
The Milky Way Tomography with Subaru Hyper Suprime-Cam. I. Halo substructures
Yoshihisa Suzuki, Masashi Chiba, Yutaka Komiyama +7
We analyze the photometric data in the Wide layer of the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) over deg to uncover new halo substructures beyond t…
Final Results of Search for New Milky Way Satellites in the Hyper Suprime-Cam Subaru Strategic Program Survey: Discovery of Two More Candidates
Daisuke Homma, Masashi Chiba, Yutaka Komiyama +11
We present the final results of our search for new Milky Way (MW) satellites using the data from the Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP) survey over …
EMPRESS. IX. Extremely Metal-Poor Galaxies are Very Gas-Rich Dispersion-Dominated Systems: Will JWST Witness Gaseous Turbulent High-z Primordial Galaxies?
Yuki Isobe, Masami Ouchi, Kimihiko Nakajima +49
We present kinematics of 6 local extremely metal-poor galaxies (EMPGs) with low metallicities () and low stellar masses (). Tak…
Tidal Features at 0.05<z<0.45 in the Hyper Suprime-Cam Subaru Strategic Program: Properties and Formation Channels
Erin Kado-Fong, Jenny E. Greene, David Hendel +10
We present 1,201 galaxies at that host tidal features, detected from the first deg of imaging from the Hyper Suprime-Cam Subaru Strategic Program (HS…