Zobrazeno 1 - 10
of 50
pro vyhledávání: '"Hisakazu Uchiyama"'
Autor:
Yuta Suzuki, Hisakazu Uchiyama, Yoshiki Matsuoka, Jun Toshikawa, Stephen Gwyn, Masatoshi Imanishi, Chengze Liu, Akatoki Noboriguchi, Marcin Sawicki, Yoshiki Toba
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 1, p 82 (2024)
We examine the local density environments around 67 quasars at z ∼ 3 by combining the imaging data of Hyper Suprime-Cam Subaru Strategic Program and Canada–France–Hawaii Telescope Large Area U -band Deep Survey over about 20 deg ^2 . Our measur
Externí odkaz:
https://doaj.org/article/1a7b6f86849f429a95c9bfe1c43571f2
Autor:
Hisakazu Uchiyama, Takuji Yamashita, Tohru Nagao, Yoshiaki Ono, Jun Toshikawa, Kohei Ichikawa, Nozomu Kawakatu, Masaru Kajisawa, Yoshiki Toba, Yoshiki Matsuoka, Mariko Kubo, Masatoshi Imanishi, Kei Ito, Toshihiro Kawaguchi, Chien-Hsiu Lee, Tomoki Saito
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 (LBG) sample from the Hyper Suprime-Cam Subaru Strategic Program data. W
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::38e507d165ead685bc8389ece52f01b8
http://arxiv.org/abs/2208.14632
http://arxiv.org/abs/2208.14632
Autor:
Rikako Ishimoto, Nobunari Kashikawa, Daichi Kashino, Kei Ito, Yongming Liang, Zheng Cai, Takehiro Yoshioka, Katsuya Okoshi, Toru Misawa, Masafusa Onoue, Yoshihiro Takeda, Hisakazu Uchiyama
The large opacity fluctuations in the $z > 5.5$ Ly$\alpha$ forest may indicate inhomogeneous progress of reionization. To explain the observed large scatter of the effective Ly$\alpha$ optical depth ($\tau_{\rm eff}$) of the intergalactic medium (IGM
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8a82b0b587ac4bcd0c4bb6c99d3097fe
http://arxiv.org/abs/2207.05098
http://arxiv.org/abs/2207.05098
Autor:
Hisakazu Uchiyama, Takuji Yamashita, Tohru Nagao, Kohei Ichikawa, Yoshiki Toba, Shogo Ishikawa, Mariko Kubo, Masaru Kajisawa, Toshihiro Kawaguchi, Nozomu Kawakatu, Chien-Hsiu Lee, Akatoki Noboriguchi
We examine the redshift evolution of density environments around 2,163 radio galaxies with the stellar masses of $\sim10^{9}-10^{12} M_\odot$ between redshifts of $z=0.3-1.4$, based on the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) and Fain
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::705639a2dc661f7c5159017dccb23e73
http://arxiv.org/abs/2206.06630
http://arxiv.org/abs/2206.06630
Autor:
Alexander Wagner, Xiaoyang Chen, Bovornpratch Vijarnwannaluk, Hikaru Fukuchi, Taiki Kawamuro, Maria Charisi, Malte Schramm, Yoshiki Matsuoka, Masayuki Akiyama, Takuji Yamashita, Masaru Kajisawa, Kohei Inayoshi, Tohru Nagao, Masayuki Tanaka, Chien-Hsiu Lee, Wanqiu He, Hyewon Suh, Janek Pflugradt, Kohei Ichikawa, Yoshiki Toba, Hisakazu Uchiyama, Yoshihiro Ueda
We present the optical and infrared properties of 39 extremely radio-loud galaxies discovered by cross-matching the Subaru/Hyper Suprime-Cam (HSC) deep optical imaging survey and VLA/FIRST 1.4 GHz radio survey. The recent Subaru/HSC strategic survey
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::58003c708b62abc5537b034baec159d5
https://resolver.caltech.edu/CaltechAUTHORS:20211116-161330116
https://resolver.caltech.edu/CaltechAUTHORS:20211116-161330116
Publikováno v:
Proceedings of the International Astronomical Union. 15:17-20
One of the key questions of the observational cosmology is how the environmental dependence of galaxies today formed. Proto-clusters, galaxy overdense regions at high redshift are important laboratory to study the formation history of clusters of gal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::82bb0a170d9b0d9f1b297461e601b848
https://doi.org/10.1017/s1743921319002904
https://doi.org/10.1017/s1743921319002904
Autor:
Nobunari Kashikawa, Masayuki Tanaka, Ikkoh Shimizu, Kei Ito, Zheng Cai, Jun Toshikawa, Kentaro Nagamine, Xiaohui Fan, J. Xavier Prochaska, Hisakazu Uchiyama, Rhythm Shimakawa, Masafusa Onoue, Yongming Liang, Kazuhiro Shimasaku
Publikováno v:
Liang, Y, Kashikawa, N, Cai, Z, Fan, X, Prochaska, J X, Shimasaku, K, Tanaka, M, Uchiyama, H, Ito, K, Shimakawa, R, Nagamine, K, Shimizu, I, Onoue, M & Toshikawa, J 2021, ' Statistical Correlation between the Distribution of Lyα Emitters and Intergalactic Medium Hi at z∼2.2 Mapped by the Subaru/Hyper Suprime-Cam ', The Astrophysical Journal, vol. 907, no. 1, pp. 3 . https://doi.org/10.3847/1538-4357/abcd93
he correlation between neutral hydrogen (H i) in the intergalactic medium (IGM) and galaxies attracts great interest. We select four fields that include several coherently strong Lyα absorption systems at z ∼ 2.2 detected using background quasars
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4f007d385c728ef5f1079bbca93ff80b
https://purehost.bath.ac.uk/ws/files/228198908/liang2021_arXiv.pdf
https://purehost.bath.ac.uk/ws/files/228198908/liang2021_arXiv.pdf
Autor:
Hisakazu Uchiyama, Takuji Yamashita, Jun Toshikawa, Nobunari Kashikawa, Kohei Ichikawa, Mariko Kubo, Kei Ito, Nozomu Kawakatu, Tohru Nagao, Yoshiki Toba, Yoshiaki Ono, Yuichi Harikane, Masatoshi Imanishi, Masaru Kajisawa, Chien-Hsiu Lee, Yongming Liang
Publikováno v:
Uchiyama, H, Yamashita, T, Toshikawa, J, Kashikawa, N, Ichikawa, K, Kubo, M, Ito, K, Kawakatu, N, Nagao, T, Toba, Y, Ono, Y, Harikane, Y, Imanishi, M, Kajisawa, M, Lee, C H & Liang, Y 2022, ' A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). VI. Distant Filamentary Structures Pointed Out by High-z Radio Galaxies at z ∼4 ', Astrophysical Journal, vol. 926, no. 1, 76 . https://doi.org/10.3847/1538-4357/ac441c
We present the environmental properties around high-$z$ radio galaxies (HzRGs) at $z\sim4$, which have been poorly investigated because of their rarity. We use the largest samples of HzRGs and $g$-dropout galaxy overdense regions at $z\sim4$, which w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dcbcc114371f8803524a3af735ea1c2a
Autor:
Yongming Liang, Nobunari Kashikawa, Murilo Marinello, Masafusa Onoue, Mariko Kubo, Kei Ito, Yuichi Harikane, Shogo Ishikawa, Masayuki Tanaka, Tohru Nagao, Jun Toshikawa, Masatoshi Imanishi, Shigeru V. Namiki, Yoshiki Matsuoka, Yutaka Komiyama, Hisakazu Uchiyama, Kohei Ichikawa, Masayuki Akiyama, Roderik Overzier
Publikováno v:
Uchiyama, H, Akiyama, M, Toshikawa, J, Kashikawa, N, Overzier, R, Nagao, T, Ichikawa, K, Marinello, M, Imanishi, M, Tanaka, M, Matsuoka, Y, Komiyama, Y, Ishikawa, S, Onoue, M, Kubo, M, Harikane, Y, Ito, K, Namiki, S & Liang, Y 2020, ' Faint Quasars Live in the Same Number Density Environments as Lyman Break Galaxies at z∼4 ', The Astrophysical Journal, vol. 905, no. 2, pp. 125 . https://doi.org/10.3847/1538-4357/abc47b
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 examine the g-dropout galaxy overdensity distribution around 570 faint quas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d282afbbe5809f18d782990faf6d2c5c
https://purehost.bath.ac.uk/ws/files/228198383/uchiyama2020_arXiv.pdf
https://purehost.bath.ac.uk/ws/files/228198383/uchiyama2020_arXiv.pdf
Autor:
Masayuki Akiyama, Takuji Yamashita, Masafusa Onoue, Hisakazu Uchiyama, Kianhong Lee, Masaru Kajisawa, Mana Niida, Yoshiki Toba, Chien-Hsiu Lee, Kotaro Kohno, Hiroyuki Ikeda, Kazuyuki Ogura, Yoshiaki Ono, Yoshiki Matsuoka, Taiki Kawamuro, Tohru Nagao, Toshihiro Kawaguchi, Yuichi Harikane, Masayuki Tanaka, Kohei Ichikawa
We report a discovery of $z = 4.72$ radio galaxy, HSC J083913.17+011308.1, by using the Lyman break technique with the Hyper Suprime-Cam Subaru Strategic Survey (HSC-SSP) catalog for VLA FIRST radio sources. The number of known high-$z$ radio galaxie
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f9cdb40d99ca59211bb831818515bb10
http://arxiv.org/abs/2006.04844
http://arxiv.org/abs/2006.04844