Výsledky vyhledávání - "Shumpei Nagoshi"

The relation between quasars’ optical spectra and variability

Autor: Shumpei Nagoshi, Fumihide Iwamuro

Publikováno v: Publications of the Astronomical Society of Japan. 74:1198-1208

This work aimed to find the relationship between quasars' optical variability and spectral features to reveal the regularity behind the random variation. It is known that quasar's FeII/Hbeta flux ratio and equivalent width of [OIII]5007 are negativel

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e6716c231b4c594ccc7f213730c3311e
https://doi.org/10.1093/pasj/psac063

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Discovery of new changing-look quasar 3C 332 and constraints for a double-peaked emission line scenario

Autor: Shumpei Nagoshi, Kazuma Wada, T. Saito, Fumihide Iwamuro

Publikováno v: Publications of the Astronomical Society of Japan. 73:596-608

Recently, a new class of quasars, called changing-look quasars (CLQs), has been reported. CLQs exhibit significant changes in optical and mid-infrared luminosity, accompanied by the appearance or disappearance of broad emission lines. We performed sp

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d872b346c6d44ae9bdebc687dc062395
https://doi.org/10.1093/pasj/psab025

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Spectroscopic and photometric observations of dwarf nova superoutbursts by the 3.8 m telescope Seimei and the Variable Star Network

Autor: Nodoka Takeuchi, Charles Galdies, Javier Ruiz, A. M. Zubareva, Sergey Yu. Shugarov, Kenneth Menzies, Geoffrey Stone, Keisuke Isogai, Mariko Kimura, Keiichi Maeda, Igor Kudzej, Daisaku Nogami, Kenta Taguchi, Kosuke Namekata, N. A. Katysheva, Minoru Yamamoto, Shumpei Nagoshi, Roger D. Pickard, Nikolaj V. Pit, Pavol A. Dubovsky, Naoto Kojiguchi, Yasuyuki Wakamatsu, Aleksei A. Sosnovskij, Katsura Matsumoto, Tonny Vanmunster, Seiichiro Kiyota, Momoka Nakagawa, Kirill A. Antonyuk, Sjoerd Dufoer, Shawn Dvorak, Aleksei V. Baklanov, Kenji Hirosawa, Masao Funada, Drahomir Chochol, Ryota Matsumura, Alexandr A. Belinski, Miho Kawabata, Taichi Kato, Oksana I. Antonyuk, Umut Burgaz, Tamás Tordai, Tomas Medulka, Yusuke Tampo, N. P. Ikonnikova, Masanori Mizutani, Soshi Okamoto, Mitsutaka Hiraga, Masaaki Otsuka, Hiroyuki Maehara, Yasuo Sano, Julia V. Babina, Hiroshi Itoh, Yutaka Maeda, Franz-Josef Hambsch, Daiti Fujii, M. A. Burlak, Yuki Zenkou, Elena P. Pavlenko, Stephen M. Brincat, Masaaki Shibata, Masayuki Moriyama

Publikováno v: Digital.CSIC. Repositorio Institucional del CSIC
instname

arXiv:2104.04948v1
et al.
We present spectroscopic and photometric observations of 17 dwarf-nova superoutbursts obtained by KOOLS-IFU mounted on the 3.8 m telescope Seimei at the Okayama Observatory of Kyoto University and through the Varia

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::686bfa59a81b902d7a77b30ed7db8732
http://hdl.handle.net/10261/260573

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Discovery of a new extreme changing-state quasar with 4 mag variation, SDSS J125809.31+351943.0

Autor: Fumihide Iwamuro, Kazuma Wada, Tomoki Saito, Shumpei Nagoshi

We report the discovery of a quasar, SDSS J125809.31+351943.0 (J1258), which brightened in optical for 4 mag from 1983 to 2015, which is one of the largest quasar brightening events so far. The history of optical photometry data of this quasar from t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ebff079ad66d6cf425c98894dbc81058

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