Search Results - "Niinuma, Kotaro"

Parabolic Jets from the Spinning Black Hole in M87 by Nakamura, Masanori, Asada, Keiichi, Hada, Kazuhiro, Pu, Hung-Yi, Noble, Scott, Tseng, Chihyin, Toma, Kenji, Kino, Motoki, Nagai, Hiroshi, Takahashi, Kazuya, Algaba, Juan-Carlos, Orienti, Monica, Akiyama, Kazunori, Doi, Akihiro, Giovannini, Gabriele, Giroletti, Marcello, Honma, Mareki, Koyama, Shoko, Lico, Rocco, Niinuma, Kotaro, Tazaki, Fumie

“…The M87 jet is extensively examined by utilizing general relativistic magnetohydrodynamic (GRMHD) simulations, as well as the steady axisymmetric force-free…”
Get full text

Kinematics of the M87 Jet in the Collimation Zone: Gradual Acceleration and Velocity Stratification by Park, Jongho, Hada, Kazuhiro, Kino, Motoki, Nakamura, Masanori, Hodgson, Jeffrey, Ro, Hyunwook, Cui, Yuzhu, Asada, Keiichi, Algaba, Juan-Carlos, Sawada-Satoh, Satoko, Lee, Sang-Sung, Cho, Ilje, Shen, Zhiqiang, Jiang, Wu, Trippe, Sascha, Niinuma, Kotaro, Sohn, Bong Won, Jung, Taehyun, Zhao, Guang-Yao, Wajima, Kiyoaki, Tazaki, Fumie, Honma, Mareki, An, Tao, Akiyama, Kazunori, Byun, Do-Young, Kim, Jongsoo, Zhang, Yingkang, Cheng, Xiaopeng, Kobayashi, Hideyuki, Shibata, Katsunori M., Lee, Jee Won, Roh, Duk-Gyoo, Oh, Se-Jin, Yeom, Jae-Hwan, Jung, Dong-Kyu, Oh, Chungsik, Kim, Hyo-Ryoung, Hwang, Ju-Yeon, Hagiwara, Yoshiaki

“…We study the kinematics of the M87 jet using the first-year data of the KVN and VERA Array (KaVA) large program, which has densely monitored the jet at 22 and…”
Get full text

A VLA Survey of Late-time Radio Emission from Superluminous Supernovae and the Host Galaxies by Hatsukade, Bunyo, Tominaga, Nozomu, Morokuma, Tomoki, Morokuma-Matsui, Kana, Matsuda, Yuichi, Tamura, Yoichi, Niinuma, Kotaro, Motogi, Kazuhiro

“…Abstract We present the results of 3 GHz radio continuum observations of 23 superluminous supernovae (SLSNe) and their host galaxies by using the Karl G…”
Get full text

The First VERA Astrometry Catalog by Hirota, Tomoya, Nagayama, Takumi, Honma, Mareki, Adachi, Yuuki, Burns, Ross A, Chibueze, James O, Choi, Yoon Kyung, Hachisuka, Kazuya, Hada, Kazuhiro, Hagiwara, Yoshiaki, Hamada, Shota, Handa, Toshihiro, Hashimoto, Mao, Hirano, Ken, Hirata, Yushi, Ichikawa, Takanori, Imai, Hiroshi, Inenaga, Daichi, Ishikawa, Toshio, Jike, Takaaki, Kameya, Osamu, Kaseda, Daichi, Kim, Jeong Sook, Kim, Jungha, Kim, Mi Kyoung, Kobayashi, Hideyuki, Kono, Yusuke, Kurayama, Tomoharu, Matsuno, Masako, Morita, Atsushi, Motogi, Kazuhito, Murase, Takeru, Nakagawa, Akiharu, Nakanishi, Hiroyuki, Niinuma, Kotaro, Nishi, Junya, Oh, Chung Sik, Omodaka, Toshihiro, Oyadomari, Miyako, Oyama, Tomoaki, Sakai, Daisuke, Sakai, Nobuyuki, Sawada-Satoh, Satoko, Shibata, Katsunori M, Shizugami, Makoto, Sudo, Jumpei, Sugiyama, Koichiro, Sunada, Kazuyoshi, Suzuki, Syunsaku, Takahashi, Ken, Tamura, Yoshiaki, Tazaki, Fumie, Ueno, Yuji, Uno, Yuri, Urago, Riku, Wada, Koji, Wu, Yuan Wei, Yamashita, Kazuyoshi, Yamashita, Yuto, Yamauchi, Aya, Yuda, Akito

“…Abstract We present the first astrometry catalog from the Japanese VLBI (very long baseline interferometer) project VERA (VLBI Exploration of Radio…”
Get full text

Pilot KaVA monitoring on the M 87 jet: Confirming the inner jet structure and superluminal motions at sub-pc scales by Hada, Kazuhiro, Park, Jong Ho, Kino, Motoki, Niinuma, Kotaro, Sohn, Bong Won, Ro, Hyun Wook, Jung, Taehyun, Algaba, Juan-Carlos, Zhao, Guang-Yao, Lee, Sang-Sung, Akiyama, Kazunori, Trippe, Sascha, Wajima, Kiyoaki, Sawada-Satoh, Satoko, Tazaki, Fumie, Cho, Ilje, Hodgson, Jeffrey, Lee, Jeong Ae, Hagiwara, Yoshiaki, Honma, Mareki, Koyama, Shoko, Oh, Junghwan, Lee, Taeseak, Yoo, Hyemin, Kawaguchi, Noriyuki, Roh, Duk-Gyoo, Oh, Se-Jin, Yeom, Jae-Hwan, Jung, Dong-Kyu, Oh, Chungsik, Kim, Hyo-Ryoung, Hwang, Ju-Yeon, Byun, Do-Young, Cho, Se-Hyung, Kim, Hyun-Goo, Kobayashi, Hideyuki, Shibata, Katsunori M.

“…Abstract We report the initial results of our high-cadence monitoring program on the radio jet in the active galaxy M 87, obtained by the KVN and VERA Array…”
Get full text

Detection of a bright burst from the repeating fast radio burst 20201124A at 2 GHz by Ikebe, Sota, Takefuji, Kazuhiro, Terasawa, Toshio, Eie, Sujin, Akahori, Takuya, Murata, Yasuhiro, Hashimoto, Tetsuya, Kisaka, Shota, Honma, Mareki, Yoshiura, Shintaro, Suzuki, Syunsaku, Oyama, Tomoaki, Sekido, Mamoru, Niinuma, Kotaro, Takeuchi, Hiroshi, Yonekura, Yoshinori, Enoto, Teruaki

“…Abstract We present a detection of a bright burst from the fast radio burst (FRB) 20201124A, which is one of the most active repeating FRBs, based on S-band…”
Get full text

Fundamental Parameters of the Milky Way Galaxy Based on VLBI Astrometry by Honma, Mareki, Nagayama, Takumi, Ando, Kazuma, Bushimata, Takeshi, Choi, Yoon Kyung, Handa, Toshihiro, Hirota, Tomoya, Imai, Hiroshi, Jike, Takaaki, Kim, Mi Kyoung, Kameya, Osamu, Kawaguchi, Noriyuki, Kobayashi, Hideyuki, Kurayama, Tomoharu, Kuji, Seisuke, Matsumoto, Naoko, Manabe, Seiji, Miyaji, Takeshi, Motogi, Kazuhito, Nakagawa, Akiharu, Nakanishi, Hiroyuki, Niinuma, Kotaro, Oh, Chung Sik, Omodaka, Toshihiro, Oyama, Tomoaki, Sakai, Nobuyuki, Sato, Katsuhisa, Sato, Mayumi, Shibata, Katsunori M., Shiozaki, Satoshi, Sunada, Kazuyoshi, Tamura, Yoshiaki, Ueno, Yuji, Yamauchi, Aya

“…We present analyses to determine the fundamental parameters of the Galaxy based on VLBI astrometry of 52 Galactic maser sources obtained with VERA, VLBA, and…”
Get full text

Spatially resolved molecular gas properties of host galaxy of Type I superluminous supernova SN 2017egm by Hatsukade, Bunyo, Morokuma-Matsui, Kana, Hayashi, Masao, Tominaga, Nozomu, Tamura, Yoichi, Niinuma, Kotaro, Motogi, Kazuhiro, Morokuma, Tomoki, Matsuda, Yuichi

“…Abstract We present the results of CO(1–0) observations of the host galaxy of a Type I superluminous supernova (SLSN-I), SN 2017egm, one of the closest SLSNe-I…”
Get full text

The Yamaguchi Interferometer by Fujisawa, Kenta, Aoki, Takahiro, Kanazawa, Sho, Akimoto, Masanori, Ogura, Tatsuya, Mori, Kurena, Niinuma, Kotaro, Motogi, Kazuhito, Sawada-Satoh, Satoko, Takefuji, Kazuhiro, Ogawa, Hideo, Kimura, Kimihiro, Yonekura, Yoshinori, Honma, Mareki

“…Abstract We report on the Yamaguchi Interferometer (YI), a one-baseline radio interferometer consisting of two radio telescopes with diameters of 32 m and 34…”
Get full text

Mid-infrared Excess from the West Hot Spot of the Radio Galaxy Pictor A Unveiled by WISE by Isobe, Naoki, Koyama, Shoko, Kino, Motoki, Wada, Takehiko, Nakagawa, Takao, Matsuhara, Hideo, Niinuma, Kotaro, Tashiro, Makoto

“…Mid-infrared properties are reported of the west hot spot of the radio galaxy Pictor A with the Wide-field Infrared Survey Explorer (WISE). The mid-infrared…”
Get full text

Observations of V404 Cygni during the 2015 outburst by the Nasu telescope array at 1.4 GHz by Asuma, Kuniyuki, Niinuma, Kotaro, Takefuji, Kazuhiro, Aoki, Takahiro, Kida, Sumiko, Nakajima, Hirochika, Tsubono, Kimio, Daishido, Tsuneaki

“…Abstract Waseda University Nasu telescope array is a spatial fast Fourier transform interferometer consisting of eight linearly aligned antennas with 20 m…”
Get full text

Accelerating a water maser face-on jet from a high mass young stellar object by Motogi, Kazuhito, Sorai, Kazuo, Honma, Mareki, Hirota, Tomoya, Hachisuka, Kazuya, Niinuma, Kotaro, Sugiyama, Koichiro, Yonekura, Yoshinori, Fujisawa, Kenta

“…Abstract We report on long-term single-dish and VLBI monitoring for intermittent flare activities of a dominant blue-shifted H2O maser associated with a…”
Get full text

A Face-on Accretion System in High-mass Star Formation: Possible Dusty Infall Streams within 100 AU by Motogi, Kazuhito, Hirota, Tomoya, Sorai, Kazuo, Yonekura, Yoshinori, Sugiyama, Koichiro, Honma, Mareki, Niinuma, Kotaro, Hachisuka, Kazuya, Fujisawa, Kenta, Walsh, Andrew J.

“…We report on interferometric observations of a face-on accretion system around the high-mass young stellar object, G353.273+0.641. The innermost accretion…”
Get full text

Stable Radio Core of the Blazar Mrk 501 during High-energy Active State in 2012 by Koyama, Shoko, Kino, Motoki, Doi, Akihiro, Niinuma, Kotaro, Giroletti, Marcello, Paneque, David, Akiyama, Kazunori, Giovannini, Gabriele, Zhao, Guang-Yao, Ros, Eduardo, Kataoka, Jun, Orienti, Monica, Hada, Kazuhiro, Nagai, Hiroshi, Isobe, Naoki, Kobayashi, Hideyuki, Honma, Mareki, Lico, Rocco

“…We investigate the precise location of the radio core in the nearby blazar Mrk 501 for the first time during its X-ray and TeV γ-ray active state in 2012 by…”
Get full text

A comparative study of amplitude calibrations for the East Asia VLBI Network: A priori and template spectrum methods by Cho, Ilje, Jung, Taehyun, Zhao, Guang-Yao, Akiyama, Kazunori, Sawada-Satoh, Satoko, Kino, Motoki, Byun, Do-Young, Sohn, Bong Won, Shibata, Katsunori M., Hirota, Tomoya, Niinuma, Kotaro, Yonekura, Yoshinori, Fujisawa, Kenta, Oyama, Tomoaki

“…Abstract We present the results of a comparative study of amplitude calibrations for the East Asia VLBI Network (EAVN) at 22 and 43 GHz using two different…”
Get full text

VERA monitoring of the radio jet 3C 84 in the period of 2007–2013: Detection of non-linear motion by Hiura, Koichiro, Nagai, Hiroshi, Kino, Motoki, Niinuma, Kotaro, Sorai, Kazuo, Chida, Hikaru, Akiyama, Kazunori, D’Ammando, Filippo, Giovannini, Gabriele, Giroletti, Marcello, Hada, Kazuhiro, Honma, Mareki, Koyama, Shoko, Orienti, Monica, Orosz, Gabor, Sawada-Satoh, Satoko

“…Abstract We present a kinematic study of the sub-parsec-scale radio jet of the radio galaxy 3C 84/NGC 1275 with the VLBI Exploration of Radio Astrometry (VERA)…”
Get full text

The Hitachi and Takahagi 32 m radio telescopes: Upgrade of the antennas from satellite communication to radio astronomy by Yonekura, Yoshinori, Saito, Yu, Sugiyama, Koichiro, Soon, Kang Lou, Momose, Munetake, Yokosawa, Masayoshi, Ogawa, Hideo, Kimura, Kimihiro, Abe, Yasuhiro, Nishimura, Atsushi, Hasegawa, Yutaka, Fujisawa, Kenta, Ohyama, Tomoaki, Kono, Yusuke, Miyamoto, Yusuke, Sawada-Satoh, Satoko, Kobayashi, Hideyuki, Kawaguchi, Noriyuki, Honma, Mareki, Shibata, Katsunori M., Sato, Katsuhisa, Ueno, Yuji, Jike, Takaaki, Tamura, Yoshiaki, Hirota, Tomoya, Miyazaki, Atsushi, Niinuma, Kotaro, Sorai, Kazuo, Takaba, Hiroshi, Hachisuka, Kazuya, Kondo, Tetsuro, Sekido, Mamoru, Murata, Yasuhiro, Nakai, Naomasa, Omodaka, Toshihiro

“…Abstract The Hitachi and Takahagi 32 m radio telescopes (former satellite communication antennas) were so upgraded as to work at 6, 8, and 22 GHz. We developed…”
Get full text

HINOTORI and Its Perspectives in the Black-Hole Jet Study by Tsutsumi, Toshihisa, Niinuma, Kotaro, Imai, Hiroshi, Amari, Ryoko, Shimizu, Yusuke, Ogawa, Hideo, Nishimura, Atsushi, Miyazawa, Chieko, Oyama, Tomoaki, Kaneko, Hiroyuki, Nakashima, Keisuke, Sawada-Satoh, Satoko, Aoki, Takahiro

“…Simultaneous multi-band very long baseline interferometry (VLBI) observations at millimeter wavelengths have huge potential for various science cases. However,…”
Get full text

The Past and Future of East Asia to Italy: Nearly Global VLBI by Giovannini, Gabriele, Cui, Yuzhu, Hada, Kazuhiro, Yi, Kunwoo, Ro, Hyunwook, Sohn, Bong Won, Takamura, Mieko, Buttaccio, Salvatore, D’Ammando, Filippo, Giroletti, Marcello, Hagiwara, Yoshiaki, Kino, Motoki, Kravchenko, Evgeniya, Maccaferri, Giuseppe, Melnikov, Alexey, Niinuma, Kotaro, Orienti, Monica, Wajima, Kiyoaki, Akiyama, Kazunori, Doi, Akihiro, Byun, Do-Young, Hirota, Tomoya, Honma, Mareki, Jung, Taehyun, Kobayashi, Hideyuki, Koyama, Shoko, Melis, Andrea, Migoni, Carlo, Murata, Yasuhiro, Nagai, Hiroshi, Sawada-Satoh, Satoko, Stagni, Matteo

“…We present here the East Asia to Italy Nearly Global VLBI (EATING VLBI) project. How this project started and the evolution of the international collaboration…”
Get full text

Observations of the bursting activity of the 6.7 GHz methanol maser in G33.641−0.228 by Fujisawa, Kenta, Aoki, Nozomu, Nagadomi, Yoshito, Kimura, Saki, Shimomura, Tadashi, Takase, Genta, Sugiyama, Koichiro, Motogi, Kazuhito, Niinuma, Kotaro, Hirota, Tomoya, Yonekura, Yoshinori

“…Abstract We have observed bursting variability of the 6.7 GHz methanol maser of G33.641−0.228. Five bursts were detected in the observation period of 294 days…”
Get full text