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52 papers
Diverse Protoclusters at Disclosed by Systematic Spectroscopy
Jun Toshikawa, Kentaro Koretomo, Nobunari Kashikawa +6
We present the results from follow-up spectroscopy of three protocluster candidates at , selected as overdense regions of -dropout galaxies in the wide-field imaging of…
Diverse Metallicities in Protoclusters at detected by Deep Learning
Yoshihiro Takeda, Nobunari Kashikawa, Kei Ito +12
We present spectroscopic follow-up observations with Subaru/MOIRCS of four protocluster candidate regions identified by the deep-learning model PCFNet. In three candidate regions,…
H I Absorbers as Beacons of Hidden Structure at : Multi-Component, Metal-Rich Absorption System near a Protocluster
Kentaro Koretomo, Nobunari Kashikawa, Toru Misawa +12
H I gas traces the large-scale structure and provides the primary fuel for star formation. High- protoclusters are ideal laboratories to study how H I gas is accreted and consum…
EPISODE II: Variability in the CO and HO rovibrational absorption lines in a periodically variable protostar EC 53
Seokho Lee, Jeong-Eun Lee, Chul-Hwan Kim +19
We present two-epoch JWST NIRSpec and MIRI observations of the young protostar EC 53 (V371 Ser), a periodically variable source with well-characterized quiescent and burst phases.…
The Evolution of the SFR-M_* relation at 0.1<z<4: Environmental and Morphological Dependencies
Kaimin He, Ke Shi, Jun Toshikawa +2
We present a comprehensive study of the relationship between star formation rate (SFR) and stellar mass (M_*) from z = 0.1 to z = 4 using a mass-complete sample of approximately 29…
Narrowband Imaging of a z=3.24 Protocluster: Insights from [O III] Emitting Galaxies
Ke Shi, Jun Toshikawa, XianZhong Zheng +2
We present a narrowband imaging on a spectroscopically confirmed protocluster ``D4UD01'' at z=3.24 using CFHT/WIRCam. We identify a sample of 24 [O III] emission line galaxies in t…
Mining for Protoclusters at from Photometric Datasets with Deep Learning
Yoshihiro Takeda, Nobunari Kashikawa, Kei Ito +9
Protoclusters are high- overdense regions that will evolve into clusters of galaxies by , making them ideal for studying galaxy evolution expected to be accelerated by envi…
Environments around quasars at 3 revealed by wide-field imaging with Subaru HSC and CFHT
Yuta Suzuki, Hisakazu Uchiyama, Yoshiki Matsuoka +7
We examine the local density environments around 67 quasars at , by combining the imaging data of Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) and Canada-France-Haw…
Galaxy properties from the outskirts to the core of a protocluster at z=3.699
Jun Toshikawa, Stijn Wuyts, Nobunari Kashikawa +6
We present follow-up spectroscopy on a protocluster candidate selected from the wide-field imaging of the Hyper SuprimeCam Subaru Strategic Programme. The target protocluster candi…
Nature vs. Nurture: Revisiting the environmental impact on star formation activities of galaxies
Ke Shi, Nicola Malavasi, Jun Toshikawa +1
We present a systematic study of the environmental impact on star formation activities of galaxies using a mass-complete sample of 170k galaxies at from the latest COSM…
An enhanced abundance of bright galaxies in protocluster candidates at z~3-5
Jun Toshikawa, Stijn Wuyts, Nobunari Kashikawa +11
We present a protocluster search covering to based on the combination of the Hyper SuprimeCam Subaru Strategic Programme and the CFHT Large Area -band Deep Sur…
A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). IX. The Most Overdense Region at z~5 Inhabited by a Massive Radio Galaxy
Hisakazu Uchiyama, Takuji Yamashita, Tohru Nagao +13
We report on the galaxy density environment around a high-z radio galaxy (HzRG) at z=4.72, HSC J083913.17+011308.1 (HSC J0839+0113), probed using an r-dropout Lyman break galaxy (L…
3D intrinsic shapes of quiescent galaxies in observations and simulations
Junkai Zhang, Stijn Wuyts, Callum Witten +6
We study the intrinsic 3D shapes of quiescent galaxies over the last half of cosmic history based on their axial ratio distribution. To this end, we construct a sample of unprecede…
Cool outflows in MaNGA: a systematic study and comparison to the warm phase
Charlotte Avery, Stijn Wuyts, Natascha M. Förster Schreiber +6
This paper investigates the neutral gas phase of galactic winds via the Na I DÅ feature within MaNGA galaxies, and directly compares their incidence and…
A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). VI. Distant Filamentary Structures Pointed by High-z Radio Galaxies at z~4
Hisakazu Uchiyama, Takuji Yamashita, Jun Toshikawa +13
We present the environmental properties around high- radio galaxies (HzRGs) at , which have been poorly investigated because of their rarity. We use the largest samples…
Interrelation of the environment of Ly emitters and massive galaxies at
Kei Ito, Nobunari Kashikawa, Masayuki Tanaka +7
We present a comparison of the spatial distributions of Ly emitters (LAEs) and massive star-forming and quiescent galaxies (SFGs and QGs) at . We use the photometric re…
Incidence, scaling relations and physical conditions of ionised gas outflows in MaNGA
Charlotte R. Avery, Stijn Wuyts, Natascha M. Förster Schreiber +6
In this work, we investigate the strength and impact of ionised gas outflows within MaNGA galaxies. We find evidence for outflows in 322 galaxies ( of the analy…
Accelerated galaxy growth and environmental quenching in a protocluster at z=3.24
Ke Shi, Jun Toshikawa, Kyoung-Soo Lee +3
We present a multiwavelength study of galaxies around D4UD01, a spectroscopically confirmed protocluster at z = 3.24 to investigate environmental trends. 450 galaxies are selected…
Faint Quasars Live in the Same Number Density Environments as Lyman Break Galaxies at z ~ 4
Hisakazu Uchiyama, Masayuki Akiyama, Jun Toshikawa +16
Characterizing high-z quasar environments is key to understanding the co-evolution of quasars and the surrounding galaxies. To restrict their global picture, we statistically exami…
Statistical correlation between the distribution of Ly emitters and IGM HI at mapped by Subaru/Hyper Suprime-Cam
Yongming Liang, Nobunari Kashikawa, Zheng Cai +11
The correlation between neutral Hydrogen (HI) in the intergalactic medium (IGM) and galaxies now attracts great interests. We select four fields which include several coherently st…
A detailed study of massive galaxies in a protocluster at z=3.13
Ke Shi, Jun Toshikawa, Zheng Cai +2
We present a detailed study of Near-IR selected galaxies in a protocluster field at z = 3.13. Protocluster galaxies are selected using the available mutliwavelength data with the p…
The UV Luminosity Function of Protocluster Galaxies at : the Bright-end Excess and the Enhanced Star Formation Rate Density
Kei Ito, Nobunari Kashikawa, Jun Toshikawa +12
We report the rest-frame ultraviolet luminosity function of -dropout galaxies in 177 protocluster candidates (PC UVLF) at selected in the Hyper Suprime-Cam Subaru Strat…
The Subaru HSC Galaxy Clustering with Photometric Redshift I: Dark Halo Masses Versus Baryonic Properties of Galaxies at 0.3<z<1.4
Shogo Ishikawa, Nobunari Kashikawa, Masayuki Tanaka +8
We present the clustering properties of low- galaxies selected by the Hyper Suprime-Cam Subaru Strategic Program Wide layer over deg. The wide-field and…
Discovery of Protoclusters at z~3.7 & 4.9: Embedded in Primordial Superclusters
Jun Toshikawa, Matthew A. Malkan, Nobunari Kashikawa +5
We have carried out follow-up spectroscopy on three overdense regions of - and -dropout galaxies in the Canada-France-Hawaii Telescope Legacy Survey Deep Fields, finding two…