Search Results - "Wajima, Kiyoaki"

Collimation, Acceleration, and Recollimation Shock in the Jet of Gamma-Ray Emitting Radio-loud Narrow-line Seyfert 1 Galaxy 1H0323+342 by Hada, Kazuhiro, Doi, Akihiro, Wajima, Kiyoaki, D'Ammando, Filippo, Orienti, Monica, Giroletti, Marcello, Giovannini, Gabriele, Nakamura, Masanori, Asada, Keiichi

“…We investigated the detailed radio structure of the jet of 1H 0323+342 using high-resolution multifrequency Very Long Baseline Array observations. This source…”
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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…”
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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…”
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SHORT-TERM RADIO VARIABILITY AND PARSEC-SCALE STRUCTURE IN A GAMMA-RAY NARROW-LINE SEYFERT 1 GALAXY 1H 0323+342 by WAJIMA, KIYOAKI, Fujisawa, Kenta, Hayashida, Masaaki, Isobe, Naoki, Ishida, Takafumi, Yonekura, Yoshinori

“…We made simultaneous single-dish and very long baseline interferometer (VLBI) observations of a narrow-line Seyfert 1 galaxy 1H 323+342, showing gamma-ray…”
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Exploring the Variability of the Flat-spectrum Radio Source 1633+382. II. Physical Properties by Algaba, Juan-Carlos, Lee, Sang-Sung, Rani, Bindu, Kim, Dae-Won, Kino, Motoki, Hodgson, Jeffrey, Zhao, Guang-Yao, Byun, Do-Young, Gurwell, Mark, Kang, Sin-Cheol, Kim, Jae-Young, Kim, Jeong-Sook, Kim, Soon-Wook, Park, Jong-Ho, Trippe, Sascha, Wajima, Kiyoaki

“…The flat-spectrum radio quasar 1633+382 (4C 38.41) showed a significant increase of its radio flux density during the period 2012 March-2015 August, which…”
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Exploring the Variability of the Flat Spectrum Radio Source 1633+382. I. Phenomenology of the Light Curves by Algaba, Juan-Carlos, Lee, Sang-Sung, Kim, Dae-Won, Rani, Bindu, Hodgson, Jeffrey, Kino, Motoki, Trippe, Sascha, Park, Jong-Ho, Zhao, Guang-Yao, Byun, Do-Young, Gurwell, Mark, Kang, Sin-Cheol, Kim, Jae-Young, Kim, Jeong-Sook, Kim, Soon-Wook, Lott, Benoit, Miyazaki, Atsushi, Wajima, Kiyoaki

“…We present multi-frequency simultaneous VLBI radio observations of the flat spectrum radio quasar 1633+382 (4C 38.41) as part of the interferometric monitoring…”
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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…”
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Internal Motion of 6.7-GHz Methanol Masers in H ii Region S269 by Sawada-Satoh, Satoko, Fujisawa, Kenta, Sugiyama, Koichiro, Wajima, Kiyoaki, Honma, Mareki

“…We present the first internal motion measurement of the 6.7-GHz methanol maser within S269, a small H ii region in the outer Galaxy, which was carried out in…”
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VLBI Observations of the Most Radio-Loud, Narrow-Line Quasar SDSS J094857.3 + 002225 by Doi, Akihiro, Nagai, Hiroshi, Asada, Keiichi, Kameno, Seiji, Wajima, Kiyoaki, Inoue, Makoto

“…We observed the narrow-line quasar SDSS J094857.3 $+$ 002225, which is known to have the highest radio loudness in the narrow-line Seyfert 1 galaxies (NLS1s),…”
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Design and Development of a High-Speed Data-Acquisition System for the Korean VLBI Network by Oh, Se-Jin, Roh, Duk-Gyoo, Wajima, Kiyoaki, Kawaguchi, Noriyuki, Byun, Do-Young, Yeom, Jae-Hwan, Je, Do-Heung, Han, Seog-Tae, Iguchi, Satoru, Kawakami, Kazuyuki, Ozeki, Kensuke, Kobayashi, Hideyuki, Sasao, Tetsuo, Sohn, BongWon, Kim, JaeHeon, Miyazaki, Atsushi, Oyama, Tomoaki, Kurayama, Tomoharu

“…A new high-speed Data Acquisition System (DAS) has been developed for the millimeter-wave VLBI array newly constructed in Korea, the Korean VLBI Network (KVN)…”
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An Intrinsic Short-Term Radio Variability Observed in PKS 1510−089 by Kadota, Akiko, Fujisawa, Kenta, Sawada-Satoh, Satoko, Wajima, Kiyoaki, Doi, Akihiro

“…We searched a short-term radio variability in an active galactic nucleus, PKS 1510 $-$ 089. Daily flux monitoring for 143 d at 8.4 GHz was performed, and VLBI…”
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Constraints on the Circumnuclear Disk through Free-Free Absorption in the Nucleus of 3C 84 with KaVA and KVN at 43 and 86 GHz by Wajima, Kiyoaki, Kino, Motoki, Kawakatu, Nozomu

“…The nearby bright radio galaxy 3C 84 at the center of the Perseus cluster is an ideal target to explore the jet in an active galactic nucleus and its…”
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Internal Proper Motions of Methanol Masers at 6.7 GHz in Massive Star-Forming Region Onsala 1 by Sugiyama, Koichiro, Fujisawa, Kenta, Doi, Akihiro, Honma, Mareki, Isono, Yasuko, Kobayashi, Hideyuki, Mochizuki, Nanako, Murata, Yasuhiro, Sawada-Satoh, Satoko, Wajima, Kiyoaki

“…We present the internal proper motions of 6.7 GHz methanol masers in a massive star-forming region, Onsala 1 (ON 1), measured using the Japanese very long…”
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Japanese VLBI Network Observations of Radio-Loud Narrow-Line Seyfert 1 Galaxies by Doi, Akihiro, Fujisawa, Kenta, Inoue, Makoto, Wajima, Kiyoaki, Nagai, Hiroshi, Harada, Keiichiro, Suematsu, Kousuke, Habe, Asao, Honma, Mareki, Kawaguchi, Noriyuki, Kawai, Eiji, Kobayashi, Hideyuki, Koyama, Yasuhiro, Kuboki, Hiromitsu, Murata, Yasuhiro, Omodaka, Toshihiro, Sorai, Kazuo, Sudou, Hiroshi, Takaba, Hiroshi, Takashima, Kazuhiro, Takeda, Koji, Tamura, Sayaka, Wakamatsu, Ken-ichi

“…We performed phase-reference very long baseline interferometry (VLBI) observations on five radio-loud narrow-line Seyfert 1 galaxies (NLS1s) at 8.4 GHz with…”
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VLBI Detections of Parsec-Scale Nonthermal Jets in Radio-Loud Broad Absorption Line Quasars by Doi, Akihiro, Kawaguchi, Noriyuki, Kono, Yusuke, Oyama, Tomoaki, Fujisawa, Kenta, Takaba, Hiroshi, Sudou, Hiroshi, Wakamatsu, Ken-ichi, Yamauchi, Aya, Murata, Yasuhiro, Mochizuki, Nanako, Wajima, Kiyoaki, Omodaka, Toshihiro, Nagayama, Takumi, Nakai, Naomasa, Sorai, Kazuo, Kawai, Eiji, Sekido, Mamoru, Koyama, Yasuhiro, Asano, Shoichiro, Uose, Hisao

“…We conducted radio detection observations at 8.4 GHz for 22 radio-loud broad absorption line (BAL) quasars, selected from the Sloan Digital Sky Survey Third…”
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VERY LONG BASELINE ARRAY IMAGING OF PARSEC-SCALE RADIO EMISSIONS IN NEARBY RADIO-QUIET NARROW-LINE SEYFERT 1 GALAXIES by Doi, Akihiro, Asada, Keiichi, Fujisawa, Kenta, Nagai, Hiroshi, Hagiwara, Yoshiaki, Wajima, Kiyoaki, Inoue, Makoto

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Pair Plasma Dominance in the Parsec-Scale Relativistic Jet of 3C 345 by Hirotani, Kouichi, Iguchi, Satoru, Kimura, Moritaka, Wajima, Kiyoaki

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Radiation Testing of Consumer High-Speed LSI Chips for the Next Space VLBI Mission by Wajima, Kiyoaki, Kawaguchi, Noriyuki, Murata, Yasuhiro, Hirabayashi, Hisashi

“…We carried out two types of radiation testing of high-speed LSI chips to test their suitability for use in wideband observations by the Japanese next space…”
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Pair Plasma Dominance in the 3C 279 Jet on Parsec Scales by Hirotani, Kouichi, Iguchi, Satoru, Kimura, Moritaka, Wajima, Kiyoaki

“…We have investigated whether a pc-scale jet of 3C 279 is dominated by a normal plasma or an electron-positron plasma. By analyzing Very Long Baseline…”
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Milliarcsecond-Scale Structure in the Gamma-Ray Loud Quasar PKS 1622−297 by Wajima, Kiyoaki, Bignall, Hayley E., Kobayashi, Hideyuki, Hirabayashi, Hisashi, Murata, Yasuhiro, Edwards, Philip G., Tsuboi, Masato, Fujisawa, Kenta

“…We made a high-resolution VLBI observation of the gamma-ray loud quasar PKS 1622 $-$ 297 with the HALCA spacecraft and ground radio telescopes at 5 GHz in 1998…”
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