206 citations · 1.9k across the 52 of their papers we have counts for
52 papers
DeepDive: Simultaneous Formation of Massive Quiescent Galaxies in High-Redshift Galaxy Overdensities
Takumi Kakimoto, Masayuki Tanaka, Kei Ito +20
We report on the spectroscopic confirmation of overdense regions of massive quiescent galaxies (QGs) in the early Universe with JWST/NIRSpec. Based on data from the DeepDive NIRSpe…
The role of small-scale environments in the quenching of massive galaxies at
Takumi Kakimoto, Masayuki Tanaka, Makoto Ando +10
Massive quiescent galaxies (QGs) at high redshifts are likely progenitors of massive elliptical galaxies in the local Universe. Recent discoveries of high-redshift QGs in overdensi…
The ionised interstellar medium of DSFGs revealed by JWST/NIRSpec and ALMA: Super-solar metallicity, low ionisation parameters and, typical electron densities
Steven Gillman, Kei Ito, Francesco Valentino +25
We present a detailed study of near-infrared (2-4m) JWST/NIRSpec spectra of 48 high-redshift () galaxies detected with ALMA at . From a multi-wa…
Environment of SDSS quasars at explored by Subaru HSC
Kohei Shibata, Tohru Nagao, Hisakazu Uchiyama +5
The relationship between quasars and their galaxy environment is important for understanding the evolution of galaxies and supermassive black holes, but it is not fully understood.…
A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). X. The Massive and Passive Nature of Radio Galaxies at
Yuta Yamamoto, Tohru Nagao, Takuji Yamashita +8
High- radio galaxies (HzRGs) are considered important objects for understanding the formation and evolution of massive galaxies in the early universe. However, till date, detail…
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…
ADF22-WEB: A giant barred spiral starburst galaxy in the z = 3.1 SSA22 protocluster core
H. Umehata, C. C. Steidel, I. Smail +15
In the present-day universe, the most massive galaxies are ellipticals located in the cores of galaxy clusters, harboring the heaviest super-massive black holes (SMBHs). However th…
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…
A proto-cluster of massive quiescent galaxies at z=4
Masayuki Tanaka, Masato Onodera, Rhythm Shimakawa +7
We report on discovery of a concentration of massive quiescent galaxies located at z=4. The concentration is first identified using high-quality photometric redshifts based on deep…
New technique to select recent fast-quenching galaxies at using the optical colors
Mariko Kubo, Tohru Nagao, Hisakazu Uchiyama +4
Many massive quiescent galaxies have been discovered at thanks to multi-wavelength deep and wide surveys, however, substantial deep near-infrared spectroscopic observations a…
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 massive quiescent galaxy in a group environment at
Takumi Kakimoto, Masayuki Tanaka, Masato Onodera +10
We report on the spectroscopic confirmation of a massive quiescent galaxy at in the COSMOS field. The object was first identified as a galaxy with suppressed…
Size - Stellar Mass Relation and Morphology of Quiescent Galaxies at in Public Fields
Kei Ito, Francesco Valentino, Gabriel Brammer +19
We present the results of a systematic study of the rest-frame optical morphology of quiescent galaxies at using the Near-Infrared Camera (NIRCam) onboard . Based…
Revisiting the Properties of X-ray AGN in the SSA22 Protocluster: Normal SMBH and Host-Galaxy Growth for AGN in a Overdensity
Erik B. Monson, Keith Doore, Rafael T. Eufrasio +6
We analyze the physical properties of 8 X-ray selected active galactic nuclei (AGN) and one candidate protoquasar system (ADF22A1) in the SSA22 protocluster by fitting t…
An Atlas of Color-selected Quiescent Galaxies at in Public Fields
Francesco Valentino, Gabriel Brammer, Katriona M. L. Gould +24
We present the results of a systematic search for candidate quiescent galaxies in the distant Universe in eleven fields with publicly available observations collected during…
COSMOS2020: Discovery of a protocluster of massive quiescent galaxies at
Kei Ito, Masayuki Tanaka, Francesco Valentino +9
Protoclusters of galaxies have been found in the last quarter century. However, most of them have been found through the overdensity of star-forming galaxies, and there had been no…
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…
An AGN with an ionized gas outflow in a massive quiescent galaxy in a protocluster at
Mariko Kubo, Hideki Umehata, Yuichi Matsuda +13
We report the detection of an ionized gas outflow from an -ray active galactic nucleus (AGN) hosted in a massive quiescent galaxy in a protocluster at (J221737.29+00182…
A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). VII. Redshift Evolution of Radio Galaxy Environments at z=0.3-1.4
Hisakazu Uchiyama, Takuji Yamashita, Tohru Nagao +9
We examine the redshift evolution of density environments around 2,163 radio galaxies with the stellar masses of between redshifts of , base…
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…
ALMA Observations of Lyman-alpha Blob 1: Multiple major-mergers and widely distributed interstellar media
Hideki Umehata, Ian Smail, Charles C. Steidel +11
We present observations of a giant Lyman-alpha blob in the SSA22 proto-cluster at z=3.1, SSA22-LAB1, taken with the Atacama Large Millimeter/submillimeter Array (ALMA). Dust contin…
A massive quiescent galaxy confirmed in a protocluster at z=3.09
Mariko Kubo, Hideki Umehata, Yuichi Matsuda +10
We report a massive quiescent galaxy at spectroscopically confirmed at a protocluster in the SSA22 field by detecting the Balmer and Ca {\fo…
On the Nature of AGN and Star Formation Enhancement in the SSA22 Protocluster: The HST WFC3 IR View
Erik B. Monson, Bret D. Lehmer, Keith Doore +9
We examine possible environmental sources of the enhanced star formation and active galactic nucleus (AGN) activity in the SSA22 protocluster using Hubble WFC3 F160W ($\…
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…