Search Results - "Sugiyama, Koichiro"

Mid-infrared and Maser Flux Variability Correlation in Massive Young Stellar Object G036.70+00.09 by Uchiyama, Mizuho, Ichikawa, Kohei, Sugiyama, Koichiro, Tanabe, Yoshihiro, Yonekura, Yoshinori

“…Abstract We present the discovery of the simultaneous flux variation of a massive young stellar object (MYSO) G036.70+00.09 (G036.70) both in the maser…”
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Evaluation of the Surface Condition of Spur Gears Using the Acoustic Emission Method by Sugiyama, Koichiro, Matsuo, Takuma

“…The vibration method is a standard non-destructive inspection method used to identify defects in rotary machines. However, it is difficult to detect defects at…”
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Large-scale Effect of an Accretion Burst in the High-Mass Young Stellar Object G358.93-0.03-MM1 by Miao, Dan, Chen, Xi, Bayandina, Olga S., Sobolev, Andrej M., Li, Wan-jun, Sugiyama, Koichiro

“…Abstract The high-mass young stellar object G358.93-0.03-MM1 underwent a rapid accretion burst event from 2019 January to June, resulting in flares observed in…”
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New maser species tracing spiral-arm accretion flows in a high-mass young stellar object by Chen, Xi, Sobolev, Andrej M., Ren, Zhi-Yuan, Parfenov, Sergey, Breen, Shari L., Ellingsen, Simon P., Shen, Zhi-Qiang, Li, Bin, MacLeod, Gordon C., Baan, Willem, Brogan, Crystal, Hirota, Tomoya, Hunter, Todd R., Linz, Hendrik, Menten, Karl, Sugiyama, Koichiro, Stecklum, Bringfried, Gong, Yan, Zheng, Xingwu

“…Numerical simulations have predicted that substructures such as spiral arms can be produced through a gravitationally unstable disk around high-mass young…”
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Proper Motions of Water Masers in W49 N Measured by KaVA by Asanok, Kitiyanee, Gray, Malcolm D., Hirota, Tomoya, Sugiyama, Koichiro, Phetra, Montree, Kramer, Busaba H., Liu, Tie, Kim, Kee-Tae, Pimpanuwat, Bannawit

“…Abstract We report the proper motions of 22 GHz water masers toward W49 N that were observed by the KVN and VERA Array (KaVA) during 2017 February–May. We…”
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Near-infrared monitoring of the accretion outburst in the massive young stellar object S255-NIRS3 by Uchiyama, Mizuho, Yamashita, Takuya, Sugiyama, Koichiro, Nakaoka, Tatsuya, Kawabata, Miho, Itoh, Ryosuke, Yamanaka, Masayuki, Akitaya, Hiroshi, Kawabata, Koji, Yonekura, Yoshinori, Saito, Yu, Motogi, Kazuhito, Fujisawa, Kenta

“…Abstract We followed up the massive young stellar object S255-NIRS3 (= S255-IRS1b) during its recent accretion outburst event in the $K_{\rm s}$ band with…”
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JCMT 850 μm Continuum Observations of Density Structures in the G35 Molecular Complex by Shen, Xianjin, Liu, Hong-Li, Ren, Zhiyuan, Tej, Anandmayee, Li, Di, Liu, Hauyu Baobab, Fuller, Gary A., Xie, Jinjin, Jiao, Sihan, Yang, Aiyuan, Koch, Patrick M., Xu, Fengwei, Sanhueza, Patricio, Diep, Pham Ngoc, Peretto, Nicolas, Yadav, R. K., Kramer, Busaba H., Sugiyama, Koichiro, Rawlings, Mark G., Lee, Chang Won, Tatematsu, Ken’ichi, Harsono, Daniel, Eden, David, Kwon, Woojin, Tsai, Chao-Wei, White, Glenn J., Kim, Kee-Tae, Liu, Tie, Wang, Ke, Zhang, Siju, Jiao, Wenyu, Yang, Dongting, Das, Swagat R., Wu, Jingwen, Wang, Chen

“…Abstract Filaments are believed to play a key role in high-mass star formation. We present a systematic study of the filaments and their hosting clumps in the…”
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The shortest periodic and flaring flux variability of a methanol maser emission at 6.7 GHz in G 014.23−00.50 by Sugiyama, Koichiro, Nagase, Katsura, Yonekura, Yoshinori, Momose, Munetake, Yasui, Yasutaka, Saito, Yu, Motogi, Kazuhito, Honma, Mareki, Hachisuka, Kazuya, Matsumoto, Naoko, Uchiyama, Mizuho, Fujisawa, Kenta

“…Abstract We detected flaring flux variability that regularly occurred with a period of 23.9 d on a 6.7 GHz methanol maser emission at Vlsr = 25.30 km s−1 in…”
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Measuring the impact of Indonesian antennas on global geodetic VLBI network by Huda, Ibnu Nurul, Hidayat, Taufiq, Dermawan, Budi, Lambert, Sébastien, Liu, Niu, Leon, Stéphane, Fujisawa, Kenta, Yonekura, Yoshinori, Sugiyama, Koichiro, Hirota, Tomoya, Premadi, Premana W., Breton, Rene, Minh, Young-Chol, Jaroenjittichai, Phrudth, Wijaya, Dudy, Pradipta, Dhota, Putri, Nabila S. E., Ramadhan, Sahlan, Puspitarini, Lucky, Wulandari, Hesti R. T., Hafieduddin, Mohammad

“…In the near future, two radio telescopes will be installed in the Indonesian region. These telescopes are proposed to be integrated into the existing Very Long…”
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Multiple Outflows in the High-mass Cluster-forming Region G25.82-0.17 by Kim, Jungha, Kim, Mi Kyoung, Hirota, Tomoya, Kim, Kee-Tae, Sugiyama, Koichiro, Honma, Mareki, Byun, Do-young, Oh, Chungsik, Motogi, Kazuhito, Kang, Jihyun, Kim, Jeongsook, Liu, Tie, Hu, Bo, Burns, Ross A., Chibueze, James O., Matsumoto, Naoko, Sunada, Kazuyoshi

“…We present results of continuum and spectral line observations with Atacama Large Millimeter/submillimeter Array (ALMA) and 22 GHz water (H2O) maser…”
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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…”
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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…”
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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…”
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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…”
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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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Periodic flare of the 6.7-GHz methanol maser in IRAS 22198+6336 by Fujisawa, Kenta, Takase, Genta, Kimura, Saki, Aoki, Nozomu, Nagadomi, Yoshito, Shimomura, Tadashi, Sugiyama, Koichiro, Motogi, Kazuhito, Niinuma, Kotaro, Hirota, Tomoya, Yonekura, Yoshinori

“…We have detected periodic flares of the 6.7-GHz methanol maser from an intermediate-mass star-forming region IRAS 22198+6336. The maser was monitored daily in…”
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Multifrequency VLBI Observations of the Broad Absorption Line Quasar J1020 4320: Recently Restarted Jet Activity? by Doi, Akihiro, Murata, Yasuhiro, Mochizuki, Nanako, Takeuchi, Hiroshi, Asada, Keiichi, Hayashi, Takayuki J., Nagai, Hiroshi, Shibata, Katsunori M., Oyama, Tomoaki, Jike, Takaaki, Fujisawa, Kenta, Sugiyama, Koichiro, Ogawa, Hideo, Kimura, Kimihiro, Honma, Mareki, Kobayashi, Hideyuki, Koyama, Shoka

“…This paper reports on very-long-baseline interferometry observations of the radio-loud broad absorption line (BAL) quasar J1020 $ +$ 4320 at 1.7, 2.3, 6.7, and…”
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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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A Synchronized Variation of the 6.7GHz Methanol Maser in Cepheus A by Sugiyama, Koichiro, Fujisawa, Kenta, Doi, Akihiro, Honma, Mareki, Isono, Yasuko, Kobayashi, Hideyuki, Mochizuki, Nanako, Murata, Yasuhiro

“…We present the results of monitoring observations of a 6.7GHz methanol maser in Cepheus A (Cep A) using the Yamaguchi 32m radio telescope and of imaging…”
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Precessing jet nozzle connecting to a spinning black hole in M87 by Cui, Yuzhu, Hada, Kazuhiro, Kawashima, Tomohisa, Kino, Motoki, Lin, Weikang, Mizuno, Yosuke, Ro, Hyunwook, Honma, Mareki, Yi, Kunwoo, Yu, Jintao, Park, Jongho, Jiang, Wu, Shen, Zhiqiang, Kravchenko, Evgeniya, Algaba, Juan-Carlos, Cheng, Xiaopeng, Cho, Ilje, Giovannini, Gabriele, Giroletti, Marcello, Jung, Taehyun, Lu, Ru-Sen, Niinuma, Kotaro, Oh, Junghwan, Ohsuga, Ken, Sawada-Satoh, Satoko, Sohn, Bong Won, Takahashi, Hiroyuki R., Takamura, Mieko, Tazaki, Fumie, Trippe, Sascha, Wajima, Kiyoaki, Akiyama, Kazunori, An, Tao, Asada, Keiichi, Buttaccio, Salvatore, Byun, Do-Young, Cui, Lang, Hagiwara, Yoshiaki, Hirota, Tomoya, Hodgson, Jeffrey, Kawaguchi, Noriyuki, Kim, Jae-Young, Lee, Sang-Sung, Lee, Jee Won, Lee, Jeong Ae, Maccaferri, Giuseppe, Melis, Andrea, Melnikov, Alexey, Migoni, Carlo, Oh, Se-Jin, Sugiyama, Koichiro, Wang, Xuezheng, Zhang, Yingkang, Chen, Zhong, Hwang, Ju-Yeon, Jung, Dong-Kyu, Kim, Hyo-Ryoung, Kim, Jeong-Sook, Kobayashi, Hideyuki, Li, Bin, Li, Guanghui, Li, Xiaofei, Liu, Zhiyong, Liu, Qinghui, Liu, Xiang, Oh, Chung-Sik, Oyama, Tomoaki, Roh, Duk-Gyoo, Wang, Jinqing, Wang, Na, Wang, Shiqiang, Xia, Bo, Yan, Hao, Yeom, Jae-Hwan, Yonekura, Yoshinori, Yuan, Jianping, Zhang, Hua, Zhao, Rongbing, Zhong, Weiye

“…The nearby radio galaxy M87 offers a unique opportunity to explore the connections between the central supermassive black hole and relativistic jets. Previous…”
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