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People > Postdoc > Curriculum Vita
Toba, Yoshiki
Postdoc Fellow
photo of Toba, Yoshiki
Office: ASMAB 1306
TEL: +886-2-2366-5428
FAX: +886-2-2367-7849
Email: toba_replace2@_asiaa.sinica.edu.tw

Education and Positions

  • Postdoc, ASIAA (2016~present)
  • Postdoc, Research Center for Space and Cosmic Evolution (RCSCE), Ehime University (2014~2016)
  • Ph.D in Astronomy, The Graduate University for Advanced Studies (SOKENDAI) (2009~2014)

Research Interests

Active Galactic Nuclei (AGNs), Dust torus of AGNs, Co-evolution of galaxies and supermassive black holes, Dust Obscured Galaxies (DOGs)

Recent Journal Papers

  1. Yuji Shirasaki*, Masayuki Akiyama, Tohru Nagao, (Yoshiki Toba), Wanqiu He, Masatoshi Ohishi, Yoshihiko Mizumoto, Satoshi Miyazaki, Atsushi J. Nishizawa, Tomonori Usuda, "Clustering of galaxies around AGN in the HSC Wide survey" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2017, accepted [SCI]
  2. Wanqiu He*, Masayuki Akiyama, James Bosch, Motohiro Enoki, Yuichi Harikane, Hiroyuki Ikeda, Nobunari Kashikawa, Toshihiro Kawaguchi, Yutaka Komiyama, Chien-Hsiu Lee, Yoshiki Matsuoka, Satoshi Miyazaki, Tohru Nagao, Masahiro Nagashima, Mana Niida, Atsushi J Nishizawa, Masamune Oguri, Masafusa Onoue, Taira Oogi, Masami Ouchi, Andreas Schulze, Yuji Shirasaki, John D. Silverman, Manobu M. Tanaka, Masayuki Tanaka, (Yoshiki Toba), Hisakazu Uchiyama, Takuji Yamashita, "Clustering of quasars in a wide luminosity range at redshift 4 with Subaru Hyper Suprime-Cam wide field imaging" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2017, accepted [SCI]
  3. Masafusa Onoue*, Nobunari Kashikawa, Hisakazu Uchiyama, Masayuki Akiyama, Yuichi Harikane, Masatoshi Imanishi, Yutaka Komiyama, Yoshiki Matsuoka, Tohru Nagao, Atsushi J. Nishizawa, Masamune Oguri, Masami Ouchi, Masayuki Tanaka, (Yoshiki Toba), Jun Toshikawa, "Enhancement of Galaxy Overdensity around Quasar Pairs at z < 3.6 based on the Hyper Suprime-Cam Subaru Strategic Program Survey" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2017, accepted [SCI]
  4. Hiroaki Aihara, ..., Masayuki Tanaka*,..., (Yoshiki Toba), … et al., "First Data Release of the Hyper Suprime-Cam Subaru Strategic Program" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2017, accepted [SCI]
  5. (Yoshiki Toba)*, Shinya Komugi, Tohru Nagao, Takuji Yamashita, Wei-Hao Wang, Masatoshi Imanishi, Ai-Lei Sun , "No sign of strong molecular gas outflow in an infrared-bright dust-obscured galaxy with strong ionized-gas outflow" , ASTROPHYSICAL JOURNAL, 2017, accepted [SCI]
  6. Yoshiki Matsuoka*, Masafusa Onoue, Nobunari Kashikawa, Kazushi Iwasawa, Michael A. Strauss, Tohru Nagao, Masatoshi Imanishi, Chien-Hsiu Lee, Masayuki Akiyama, Naoko Asami, James Bosch, Sebastien Foucaud, Hisanori Furusawa, Tomotsugu Goto, James E. Gunn, Yuichi Harikane, Hiroyuki Ikeda, Takuma Izumi, Toshihiro Kawaguchi, Satoshi Kikuta, Kotaro Kohno, Yutaka Komiyama, Robert H. Lupton, Takeo Minezaki, Satoshi Miyazaki, Tomoki Morokuma, Hitoshi Murayama, Mana Niida, Atsushi J. Nishizawa, Masamune Oguri, Yoshiaki Ono, Masami Ouchi, Paul A. Price, Hiroaki Sameshima, Andreas Schulze, Hikari Shirakata, John D. Silverman, Naoshi Sugiyama, Philip J. Tait, Masahiro Takada, Tadafumi Takata, Masayuki Tanaka, Ji-Jia Tang, (Yoshiki Toba), Yousuke Utsumi, Shiang-Yu Wang, "Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). II. Discovery of 32 Quasars and Luminous Galaxies at 5.7 < z < 6.8" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2017, accepted [SCI]
  7. Hiroaki Aihara, ..., Masahiro Takada*,..., (Yoshiki Toba)… et al., "The Hyper Suprime-Cam SSP Survey: Overview and Survey Design" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2017, accepted [SCI]
  8. Yusei Koyama*, Masao Hayashi, Masayuki Tanaka, Tadayuki Kodama, Rhythm Shimakawa, Moegi Yamamoto, Fumiaki Nakata, Ichi Tanaka, Tomoko Suzuki, Ken-ichi Tadaki, Atsushi J. Nishizawa, Kiyoto Yabe, (Yoshiki Toba), Lihwai Lin, Hung-Yu Jian, Yutaka Komiyama, "The nature of Hα-selected galaxies along the huge cosmic web at z=0.4 revealed by Subaru Hyper Suprime-Cam survey" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2017, accepted [SCI]
  9. Masayuki Akiyama*, Wanqiu He, Hiroyuki Ikeda, Mana Niida, Tohru Nagao, James Bosch, Jean Coupon, Motohiro Enoki, Masatoshi Imanishi, Nobunari Kashikawa, Toshihiro Kawaguchi, Yutaka Komiyama, Chien-Hsiu Lee, Yoshiki Matsuoka, Satoshi Miyazaki, Atsushi J. Nishizawa, Masamune Oguri, Yoshiaki Ono, Masafusa Onoue, Masami Ouchi, Andreas Schulze, John D. Silverman, Manobu M. Tanaka, Masayuki Tanaka, Yuichi Terashima, (Yoshiki Toba), Yoshihiro Ueda, "The Quasar Luminosity Function at Redshift 4 with the Hyper Suprime-Cam Wide Survey" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2017, accepted [SCI]
  10. Yuichi Terashima*, Makoto Suganuma , Masayuki Akiyama, Jenny E. Greene, Toshihiro Kawaguchi, Kazushi Iwasawa, Tohru Nagao, Hirofumi Noda, (Yoshiki Toba), Yoshihiro Ueda, Takuji Yamashita, "X-Ray bright optically faint active galactic nuclei in the Subaru Hyper Suprime-Cam wide survey" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2017, accepted [SCI]
  11. Yu-Yen Chang*, Emeric Le Floc'h, Stéphanie Juneau, Elisabete da Cunha, Mara Salvato, Francesca Civano, Stefano Marchesi, Olivier Ilbert, (Yoshiki Toba), Chen-Fatt Lim, Ji-Jia Tang, Wei-Hao Wang, Nicholas Ferraro, Megan C. Urry, Richard E. Griffiths, Jeyhan S. Kartaltepe, "Infrared Selection of Obscured Active Galactic Nuclei in the COSMOS Field" , ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES: 223 (2), 19-37, 2017-12 [SCI] (Fulltext)
  12. (Yoshiki Toba)*, Hyun-Jin Bae, Tohru Nagao, Jong-Hak Woo, Wei-Hao Wang, Alexander Y. Wagner, Ai-Lei Sun, Yu-Yen Chang, "Ionized gas outflows in infrared-bright dust-obscured galaxies selected with WISE and SDSS" , ASTROPHYSICAL JOURNAL: 850 (2), 140-155, 2017-12 [SCI] (Fulltext)
  13. Wei-Hao Wang*, Wei-Ching Lin, Chen-Fatt Lim, Ian Smail, Scott C. Chapman, Xian Zhong Zheng, Hyunjin Shim, Tadayuki Kodama, Omar Almaini, Yiping Ao, Andrew W. Blain, Nathan Bourne, Andrew J. Bunker, Yu-Yen Chang, Dani C.-Y. Chao, Chian-Chou Chen, David L. Clements, Christopher J. Conselice, William I. Cowley, Helmut Dannerbauer, James S. Dunlop, James E. Geach, Tomotsugu Goto, Linhua Jiang, Rob J. Ivison, Woong-Seob Jeong, Kotaro Kohno, Xu Kong, Chien-Hsu Lee, Hyung Mok Lee, Minju Lee, Michal J. Michalowski, Ivan Oteo, Marcin Sawicki, Douglas Scott, Xin Wen Shu, James M. Simpson, Wei-Leong Tee, (Yoshiki Toba), Elisabetta Valiante, Jun-Xian Wang, Ran Wang, Julie L. Wardlow, "SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES): Faint-End Counts at 450 µm" , ASTROPHYSICAL JOURNAL: 850 (1), 37-53, 2017-11 [SCI] (Fulltext)
  14. J.M.Simpson*. I.Smail, W-H.Wang, D. Riechers, J.S. Dunlop, Y.Ao, N.Bourne, A.Bunker, S.C. Chapman, C-Ch Chen, H.Dannerbauer, J.E.Geach, T.Goto, C.M. Harrison, H.S. Hwang, R.J. Ivison, T.Kodama, C.-H. Lee, H.-M. Lee, M. Lee, C.-F. Lim, M.J. Michalowski, D.J. Rosario, H.Shim, X.W. Shu, A.M. Swinbank, W.-L.Tee, (Y.Toba), E.Valiante, J.Wang, X.Z.Zheng,, "An Imperfectly Passive Nature: Bright Submillimeter Emission from Dust-obscured Star Formation in the z = 3.717 “Passive” System, ZF 20115" , Astrophysical Journal Letters: 844 (1), 10-14, 2017-07 [SCI] (Fulltext)
  15. Jorge Díaz Tello*, Takamitsu Miyaji, Tsuyoshi Ishigaki, Mirko Krumpe, Yoshihiro Ueda, Hermann Brunner, Tomotsugu Goto, Hitoshi Hanami, (Yoshiki Toba), "High excitation emission line nebula associated with an ultra luminous X-ray source at z=0.027 in the AKARI north ecliptic pole deep field" , ASTRONOMY & ASTROPHYSICS: 604, A14, 7, 2017-07 [SCI] (Fulltext)
  16. Kazuyuki Ogura*, Tohru Nagao, Masatoshi Imanishi, Nobunari Kashikawa, Yoshiaki Taniguchi, Masaru Kajisawa, Masakazu Kobayashi, (Yoshiki Toba), Kodai Nobuhara, "A search for Lyα emitters around a concentrated region of strong Lyα absorbers at z = 2.3" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 69 (3), 51-65, 2017-06 [SCI] (Fulltext)
  17. Kota Kawasaki*, Tohru Nagao, (Yoshiki Toba), Koki Terao, Kenta Matsuoka, "Active Galactic Nuclei with a Low-Metallicity Narrow-Line Region" , ASTROPHYSICAL JOURNAL: 842 (1), 44-56, 2017-06 [SCI] (Fulltext)
  18. (Yoshiki Toba)*, Tohru Nagao, Wei-Hao Wang, Hideo Matsuhara, Masayuki Akiyama , Tomotsugu Goto, Yusei Koyama, Youich Ohyama, Issei Yamamura, "Far-infrared Properties of Infrared-bright Dust-obscured Galaxies Selected with IRAS and AKARI Far-infrared All-sky Survey" , ASTROPHYSICAL JOURNAL: 40 (1), 21-30, 2017-05 [SCI] (Fulltext)
  19. (Yoshiki Toba)*, Shinki Oyabu, Hideo Matsuhara, Daisuke Ishihara, Matt A. Malkan, Takehiko Wada, Youichi Ohyama, Hirokazu Kataza, Satoshi Takita, Chisato Yamauch, "Luminosity Dependence of the Covering Factor of the Dust Torus in Active Galactic Nuclei Revealed by Akari" , Publications of The Korean Astronomical Society: 32 (1), 193-195, 2017-03 (Fulltext)
  20. (Yoshiki Toba)*, Tohru Nagao, Masaru Kajisawa, Taira Oogi, Masayuki Akiyama, Hiroyuki Ikeda, Jean Coupon, Michael A. Strauss, Wei-Hao Wang, Masayuki Tanaka, Mana Niida, Masatoshi Imanishi, Chien-Hsiu Lee, Hideo Matsuhara, Yoshiki Matsuoka, Masafusa Onoue, Yuichi Terashima, Yoshihiro Ueda, Yuichi Harikane, Yutaka Komiyama, Satoshi Miyazaki, Akatoki Noboriguchi, Tomonori Usuda, "Clustering of Infrared-bright Dust-obscured Galaxies Revealed by the Hyper Suprime-Cam and WISE" , ASTROPHYSICAL JOURNAL: 835 (1), 36-47, 2017-01 [SCI] (Fulltext)
  21. Kohei Ichikawa*, Claudio Ricci, Yoshihiro Ueda, Kenta Matsuoka, (Yoshiki Toba), Taiki Kawamuro, Benny Trakhtenbrot, Michael J. Koss, "The Complete Infrared View of Active Galactic Nuclei from the 70-month Swift/BAT Catalog" , ASTROPHYSICAL JOURNAL: 835 (1), 74-92, 2017-01 [SCI] (Fulltext)
  22. Koki Terao*, Tohru Nagao, Tetsuya Hashimoto, Kenshi Yanagisawa, Kenta Matsuoka, (Yoshiki Toba), Hiroyuki Ikeda, Yoshiaki Taniguchi, "Near-infrared spectroscopy of nearby Seyfert galaxies: Is there evidence for the shock excitation in narrow-line regions?" , ASTROPHYSICAL JOURNAL: 833 (2), 190-201, 2016-12 [SCI] (Fulltext)
  23. Mana Niida*, Tohru Nagao, Hiroyuki Ikeda, Kenta Matsuoka, Masakazu A. R. Kobayashi, (Yoshiki Toba), Yoshiaki Taniguchi, "Revisiting the Completeness and the Luminosity Function in High-Redshift Low-Luminosity Quasar Surveys" , ASTROPHYSICAL JOURNAL: For Volume 832, Issue 2, article id. 208, 12 pp., 2016-12 [SCI] (Fulltext)
  24. Naoki Isobe*, Taiki Kawamuro, Shinki Oyabu, Takao Nakagawa, Shunsuke Baba, Kenichi Yano, Yoshihiro Ueda, (Yoshiki Toba), "X-ray and infrared diagnostics of nearby active galactic nuclei with MAXI and AKARI" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: For Volume 68, Issue 6, id.98 15 pp., 2016-12 [SCI] (Fulltext)
  25. Yoshiki Matsuoka*, Masafusa Onoue, Nobunari Kashikawa, Kazushi Iwasawa, Michael A. Strauss, Tohru Nagao, Masatoshi Imanishi, Mana Niida, (Yoshiki Toba), Masayuki Akiyama, Naoko Asami, James Bosch, Sébastien Foucaud, Hisanori Furusawa, Tomotsugu Goto, James E. Gunn, Yuichi Harikane, Hiroyuki Ikeda, Toshihiro Kawaguchi, Satoshi Kikuta, Yutaka Komiyama, Robert H. Lupton, Takeo Minezaki, Satoshi Miyazaki, Tomoki Morokuma, Hitoshi Murayama, Atsushi J. Nishizawa, Yoshiaki Ono, Masami Ouchi, Paul A. Price, Hiroaki Sameshima, John D. Silverman, Naoshi Sugiyama, Philip J. Tait, Masahiro Takada, Tadafumi Takata, Masayuki Tanaka, Ji-Jia Tang, Yousuke Utsumi, "Subaru high-z exploration of low-luminosity quasars (SHELLQs). I. Discovery of 15 quasars and bright galaxies at 5.7 < z < 6.9" , ASTROPHYSICAL JOURNAL: For Volume 828, Issue 1, article id. 26, 14 pp, 2016-09 [SCI] (Fulltext)
  26. (Yoshiki Toba)*, Tohru Nagao, "Search for Hyper Infrared-Luminous Dust Obscured Galaxies selected with WISE and SDSS" , ASTROPHYSICAL JOURNAL: For Volume 820, Issue 1, article id. 46, 10 pp., 2016-03 [SCI] (Fulltext)
  27. Yuichi Terashima*, Yoshitaka Hirata, Hisamitsu Awaki, Shinki Oyabu, Poshak Gandhi, (Yoshiki Toba), Hideo Matsuhara, "A New Sample of Obscured AGNs Selected from the XMM-Newton and AKARI Surveys" , ASTROPHYSICAL JOURNAL: , Volume 814, Issue 1, article id. 11, 33 pp., 2015-11 [SCI] (Fulltext)
  28. (Yoshiki Toba)*, Tohru Nagao, Michael A. Strauss, Kentaro Aoki, Tomotsugu Goto, Masatoshi Imanishi, Toshihiro Kawaguchi, Yuichi Terashima, Yoshihiro Ueda, James Bosch, Kevin Bundy, Yoshiyuki Doi, Hanae Inami, Yutaka Komiyama, Robert H. Lupton, Hideo Matsuhara, Yoshiki Matsuoka, Satoshi Miyazaki, Tomoki Morokuma, Fumiaki Nakata, Nagisa Oi, Masafusa Onoue, Shinki Oyabu, Paul Price, Philip J. Tait, Tadafumi Takata, Manobu M. Tanaka, Tsuyoshi Terai, Edwin L. Turner, Tomohisa Uchida, Tomonori Usuda, Yousuke Utsumi, Shiang-Yu Wang, Yoshihiko Yamada, "Hyper-luminous Dust Obscured Galaxies discovered by the Hyper Suprime-Cam on Subaru and WISE" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: For Volume 67, Issue 5, id.8615 pp., 2015-10 [SCI] (Fulltext)
  29. Tomotsugu Goto*, Nagisa Oi, Youichi Ohyama, Matthew Malkan, Hideo Matsuhara, Takehiko Wada, Marios Karouzos, Myungshin Im, Takao Nakagawa, Veronique Buat, Denis Burgarella, Chris Sedgwick, (Yoshiki Toba), Woong-Seob Jeong, Lucia Marchetti, Katarzyna Małek, Ekaterina Koptelova, Dani Chao, Yi-Han Wu, Chris Pearson, Toshinobu Takagi, Hyung Mok Lee, Stephen Serjeant, Tsutomu T. Takeuchi, Seong Jin Kim, "Evolution of mid-infrared galaxy luminosity functions from the entire AKARI NEP-Deep field with new CFHT photometry" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: For Volume 452, Issue 2, p.1684-1693, 2015-09 [SCI] (Fulltext)
  30. (Yoshiki Toba)*, Shinki Oyabu, Hideo Matsuhara, Matthew A. Malkan, Poshak Gandhi, Takao Nakagawa, Naoki Isobe, Mai Shirahata, Nagisa Oi, Youichi Ohyama, Satoshi Takita, Chisato Yamauchi, Kenichi Yano, "Luminosity and Redshift Dependence of the Covering Factor of AGNs viewed with WISE and SDSS" , ASTROPHYSICAL JOURNAL: For Volume 788, Issue 1, article id. 45, 36 pp, 2014-06 [SCI] (Fulltext)
  31. (Yoshiki Toba)*, Shinki Oyabu, Hideo Matsuhara, Matthew A. Malkan, Daisuke Ishihara, Takehiko Wada, Youichi Ohyama, Satoshi Takita, Chisato Yamauchi, "The 9 and 18 Micrometer Luminosity Functions of Various Types of Galaxies with AKARI: Implication for the Dust Torus Structure of AGN" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: For Vol.65, No.5, article id.113 20 pp., 2013-10 [SCI] (Fulltext)
  32. (Yoshiki Toba)*, Shinki Oyabu, Hideo Matsuhara, Daisuke Ishihara, Matt Malkan, Takehiko Wada, Youichi Ohyama, Hirokazu Kataza, Satoshi Takita, "The 18 $\mu$m Luminosity Function of Galaxies with AKARI" , Publications of the Korean Astronomical Society: For Volume 27, issue 4, pp. 335-338, 2012-11 (Fulltext)
  33. Sinki Oyabu*, Daisuke Ishihara, Matt Malkan, Hideo Matsuhara, Takehiko Wada, Takao Nakagawa, Youich Ohyama, (Yoshiki Toba), Takashi Onaka, Satoshi Takita, Hirokazu Kataza, Issei Yamamura, Mai Shirahata, "AKARI detections of hot dust in luminous infrared galaxies. Search for dusty active galactic nuclei" , ASTRONOMY & ASTROPHYSICS: For Volume 529, id.A122, 8 pp., 2011-05 [SCI] (Fulltext)
  34. Kentaro Aoki*, Shinki Oyabu, Jay P. Dunn, Nahum Arav, Doug Edmonds, Kirk T. Korista, Hideo Matsuhara, (Yoshiki Toba), "Outflow in Overlooked Luminous Quasar: Subaru Observations of AKARI J1757+5907" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: For Vol.63, No.SP2, pp.457-467, 2011-03 [SCI] (Fulltext)
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