Precise measurements of black holes for studies of active galactic nuclei

• Project/Area Number: 24340042
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: Japan Aerospace EXploration Agency
• Principal Investigator: DOI AKIHIRO 国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 助教 (90403641)
• Co-Investigator(Kenkyū-buntansha): 永井 洋 国立天文台, チリ観測所, 准教授 (00455198) ; 萩原 喜昭 東洋大学, 文学部, 准教授 (60399300) ; 紀 基樹 国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 研究員 (70531234)
• Co-Investigator(Renkei-kenkyūsha): HAGIWARA Yoshiaki 東洋大学, 文学部, 准教授 (60399300)
• Project Period (FY): 2012-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥11,440,000 (Direct Cost: ¥8,800,000、Indirect Cost: ¥2,640,000); Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000); Fiscal Year 2012: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: ブラックホール / 活動銀河 / 銀河 / 電波天文学 / 天文学 / 干渉計 / 電波干渉計 / 位相補償 / VLBI / 電波 / ジェット / 降着円盤 / 活動銀河核 / 位置天文学 / 位置天文

Outline of Final Research Achievements

We tried to solve the "three fundamental problems" of black holes on active galactic nuclei (AGNs) through the "multi-frequency phase-referencing VLBI" method that implements position determination with accuracy comparable to the Schwarzschild radius (Rs) in addition to the direct imaging around black holes. As a result, (1) Is the primary energy source of Sgr A * and low luminosity AGN accretion disks? Jet? (2) Where is gamma-ray emitting areas in blazers and radio galaxies around black holes? (3) Spatial structure of mass accretion flow at the site near a black hole as the site of energy release? We obtained a lot of findings from the observational approach about the three problems.

Research Products

• [Int'l Joint Research] ASIAA(台湾)
• [Int'l Joint Research] Istituto Nazionale di Astrofisica(イタリア)
• [Int'l Joint Research] National Accelerator Laboratory(米国)
• [Int'l Joint Research] Max Planck Institutes(ドイツ)
• [Journal Article] Conical Stream of the Two-Sided Jets in NGC 4261 over the Range of 103-109 Schwarzschild Radii (2016)
  • Author(s): Nakahara, Satomi; Doi, Akihiro; Murata, Yasuhiro; Hada, Kazuhiro; Nakamura, Masanori; Asada, Keiichi
  • Journal Title: Galaxies Volume: vol. 4, issue 4 Issue: 4 Pages: 80-84
  • DOI: 10.3390/galaxies4040080
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A radio detection survey of narrow-line Seyfert 1 galaxies using very long baseline interferometry at 22 GHz (2016)
  • Author(s): Doi, Akihiro; Oyama, Tomoaki; Kono, Yusuke; Yamauchi, Aya; Suzuki, Syunsaku; Matsumoto, Naoko; Tazaki, Fumie
  • Journal Title: Publications of the Astronomical Society of Japan Volume: Volume 68, Issue 5 Issue: 5
  • DOI: 10.1093/pasj/psw040
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Observations of 6.7 GHz methanol masers with East-Asian VLBI Network. II. Internal proper motion measurement in G006.79-00.25 (2016)
  • Author(s): Koichiro SUGIYAMA, Kenta FUJISAWA, Kazuya HACHISUKA, Yoshinori YONEKURA, Kazuhito MOTOGI et al. (その他24名)
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 未定 Issue: 5
  • DOI: 10.1093/pasj/psv089
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] High-frequency excess in the radio continuum spectrum of the type-1 Seyfert galaxy NGC 985 (2016)
  • Author(s): Doi, Akihiro; Inoue, Yoshiyuki
  • Journal Title: Publications of the Astronomical Society of Japan Volume: Volume 68, Issue 4 Issue: 4
  • DOI: 10.1093/pasj/psw052
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] A Search for Submillimeter H2O Masers in Active Galaxies: The Detection of 321 GHZ H2O Maser Emission in NGC 4945 (2016)
  • Author(s): Hagiwara, Y., Horiuchi, S., Doi, A., Miyoshi, M., Edwards, P. G.
  • Journal Title: The Astrophysical Journal Volume: 827 Issue: 1 Pages: 69-69
  • DOI: 10.3847/0004-637x/827/1/69
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] A Radio Detection Survey of Narrow-Line Seyfert 1 Galaxies using Very-Long-Baseline Interferometry at 22 GHz (2016)
  • Author(s): Doi, Akihiro; Oyama, Tomoaki; Kono, Yusuke; Yamauchi, Aya; Suzuki, Syunsaku; Matsumoto, Naoko; Tazaki, Fumie
  • Journal Title: Publications of the Astronomical Society of Japan Volume: in press
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] High-frequency excess in the radio continuum spectrum of the type-1 Seyfert galaxy NGC 985 (2016)
  • Author(s): Akihiro Doi and Yoshiyuki Inoue
  • Journal Title: Publications of the Astronomical Society of Japan Volume: in press
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] High-sensitivity 86GHz(3.5mm) VLBI observations of M87: Deep imaging of the jet base at a resolution of 10 Schwarzschild radii (2016)
  • Author(s): Hada, K., Kino, M., Doi, A., Nagai, H., Honma, M., Akiyama, K., Tazaki, F., Lico, R., Giroletti, M., Giovannini, G., Orienti, M., Hagiwara, Y.,
  • Journal Title: The Astrophysical Journal Volume: 817 Issue: 2 Pages: 131-147
  • DOI: 10.3847/0004-637x/817/2/131
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Discovery of off-axis jet structure of TeV blazar Mrk501 with mm-VLBI (2016)
  • Author(s): Koyama, S., Kino, M., Giroletti, M., Doi, A., Giovannini, G., Orienti, M., Hada, K., Ros, E., Niinuma, K., Nagai, H., Savolainen, T., Krichbaum, T. P., Perez-Torres, M. A.
  • Journal Title: Astronomy and Astrophysics Volume: 586 Pages: 113-122
  • DOI: 10.1051/0004-6361/201526541
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Nature of radio feature formed by re-started jet activity in 3C 84 and its relation with γ-ray emissions (2016)
  • Author(s): Nagai, H., Chida, H., Kino, M., Orienti, M., D'Ammando, F., Giovannini, G., Hiura, K.
  • Journal Title: Astronomische Nachrichten Volume: 337 Issue: 1-2 Pages: 69-72
  • DOI: 10.1002/asna.201512267
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Fossil shell emission in dying radio loud AGNs (2016)
  • Author(s): Kino, Motoki, Ito, Hirotaka, Kawakatu, Nsonomu, Orienti, Monica, Nagai, Hiroshi, Wajima, Kiyoaki, Itoh, Ryo
  • Journal Title: Astronomische Nachrichten Volume: 337 Issue: 1-2 Pages: 47-52
  • DOI: 10.1002/asna.201512263
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] An obscured narrow-line Seyfert 1 galaxy candidate, Mrk 1388 with nonthermal jets (2015)
  • Author(s): Akihiro Doi
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 67 Issue: 2
  • DOI: 10.1093/pasj/psu147
  • NAID: 40020434920
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Probing Precise Location of Radio Core in TeV Blazar Mrk 501 with VERA at 43 GHz (2015)
  • Author(s): Koyama, Shoko; Kino, Motoki; Doi, Akihiro; Niinuma, Kotaro; Hada, Kazuhiro; Nagai, Hiroshi; Honma, Mareki; Akiyama, Kazunori; Giroletti, Marcello; Giovannini, Gabriele; Orienti, Monica; Isobe, Naoki; Kataoka, Jun; Paneque, David; Kobayashi, Hideyuki; Asada, Keiichi
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 未定 Issue: 4
  • DOI: 10.1093/pasj/psu144
  • Peer Reviewed
• [Journal Article] Discovery of a wandering radio jet base after a large X-ray flare in the blazar Markarian 421 (2015)
  • Author(s): Niinuma, K., Kino, M., Doi, A., Hada, K., Nagai, H., Koyama, S.
  • Journal Title: The Astrophysical Journal Letters Volume: 807 Issue: 1 Pages: 14-18
  • DOI: 10.1088/2041-8205/807/1/l14
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Determination of central engine position and accretion disk structure in NGC4261 by core shift measurements (2015)
  • Author(s): Haga, T., Doi, A., Murata, Y., Sudou, H., Kameno, S., Hada, K.
  • Journal Title: The Astrophysical Journal Volume: 807 Issue: 1 Pages: 15-29
  • DOI: 10.1088/0004-637x/807/1/15
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Apparent Inward Motion of the Parsec-Scale Jet in the BL Lac Object OJ287 during the 2011-2012 γ-ray Flares (2015)
  • Author(s): Sawada-Satoh, S.; Akiyama, K.; Niinuma, K.; Nagai, H.; Kino, M.; D'Ammando, F.; Koyama, S.; Hada, K.; Orienti, M.; Honma, M.; Shibata, K. M.
  • Journal Title: Publications of The Korean Astronomical Society Volume: 30 Issue: 2 Pages: 429-432
  • DOI: 10.5303/pkas.2015.30.2.429
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Magnetization degree at the jet base of M87 derived from the event horizon telescope data: testing magnetically driven jet paradigm (2015)
  • Author(s): Kino, M.; Takahara, F.; Hada, K.; Akiyama, K.; Nagai, H.; Sohn, B. W.
  • Journal Title: The Astrophysical Journal Volume: 803 Issue: 1 Pages: 30-30
  • DOI: 10.1088/0004-637x/803/1/30
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 230GHz VLBI observations of M87: Event-horizon-scale structure during an enhanced very-high-energy gamma-ray state in 2012 (2015)
  • Author(s): Akiyama, K., Lu, R.-S, Fish, V. L., Doeleman, S. S., Broderick, A. E., Dexter, J., Hada, K. and 41 co-authors
  • Journal Title: The Astrophysical Journal Volume: 807 Issue: 2 Pages: 150-160
  • DOI: 10.1088/0004-637x/807/2/150
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] A Fanaroff-Riley Type I Candidate in Narrow-Line Seyfert 1 Galaxy Mrk 1239 (2015)
  • Author(s): Doi, Akihiro; Wajima, Kiyoaki; Hagiwara, Yoshiaki; Inoue, Makoto
  • Journal Title: The Astrophysical Journal Letters Volume: 798 Issue: 2 Pages: L30-L30
  • DOI: 10.1088/2041-8205/798/2/l30
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Six Years of Fermi-LAT and Multi-Wavelength Monitoring of the Broad-Line Radio Galaxy 3c 120: Jet Dissipation At Sub-Parsec Scales from the Central Engine (2015)
  • Author(s): Tanaka, Y. T,, Doi, A., Inoue, Y., Cheung, C. C., Stawarz, L., Fukazawa, Y., Gurwell, M. A., Tahara, M., Kataoka, J., Itoh, R.
  • Journal Title: The Astrophysical Journal Volume: 799 Issue: 2 Pages: L18-L18
  • DOI: 10.1088/2041-8205/799/2/l18
  • Peer Reviewed / Open Access
• [Journal Article] VLBI observations of bright AGN jets with the KVN and VERA Array (KaVA): Evaluation of imaging capability (2015)
  • Author(s): Niinuma, Kotaro; Lee, Sang-Sung; Kino, Motoki; Sohn, Bong Won; Akiyama, Kazunori et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 66 Issue: 6 Pages: 103-118
  • DOI: 10.1093/pasj/psu104
  • Peer Reviewed / Open Access
• [Journal Article] ALMA Multi-line Observations of the IR-bright Merger VV 114 (2015)
  • Author(s): Saito, Toshiki; Iono, Daisuke; Yun, Min S.; Ueda, Junko; Nakanishi, Kouichiro; Sugai, Hajime; Espada, Daniel; Imanishi, Masatoshi; Motohara, Kentaro; Hagiwara, Yosiaki; Tateuchi, Ken; Lee, Minju; Kawabe, Ryohei
  • Journal Title: The Astrophysical Journal Volume: 803 Issue: 2 Pages: 60-93
  • DOI: 10.1088/0004-637x/803/2/60
  • Peer Reviewed / Open Access
• [Journal Article] Determination of Central Engine Position and Accretion Disk Structure in NGC 4261 by Core Shift Measurements (2015)
  • Author(s): Takafumi Haga, Akihiro Doi, Yasuhiro Murata, Hiroshi Sudou, Seiji Kameno, Kazuhiro Hada
  • Journal Title: The Astrophysical Journal Volume: in press
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Unveiling the nature of coronae in active galactic nuclei through submillimeter observations (2014)
  • Author(s): Inoue, Yoshiyuki; Doi, Akihiro
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 66 Issue: 6
  • DOI: 10.1093/pasj/psu079
  • NAID: 40020355554
  • Peer Reviewed / Open Access
• [Journal Article] Limb-brightened Jet of 3C 84 Revealed by the 43 GHz Very-Long-Baseline-Array Observation (2014)
  • Author(s): Nagai, H.; Haga, T.; Giovannini, G.; Doi, A.; Orienti, M.; D'Ammando, F.; Kino, M.; Nakamura, M.; Asada, K.; Hada, K.; Giroletti, M.
  • Journal Title: The Astrophysical Journal Volume: 785 Issue: 1 Pages: 53-58
  • DOI: 10.1088/0004-637x/785/1/53
  • Peer Reviewed / Open Access
• [Journal Article] Relativistic Electrons and Magnetic Fields of the M87 Jet on the ~10 Schwarzschild Radii Scale (2014)
  • Author(s): Kino, M., Takahara, F., Hada, K., and Doi, A.
  • Journal Title: The Astrophysical Journal Volume: 786 Issue: 1 Pages: 5-12
  • DOI: 10.1088/0004-637x/786/1/5
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] A Strong Radio Brightening at the Jet Base of M 87 during the Elevated Very High Energy Gamma-Ray State in 2012 (2014)
  • Author(s): Hada, K.; Giroletti, M.; Kino, M.; Giovannini, G.; D'Ammando, F.; Cheung, C. C.; Beilicke, M.; Nagai, H.; Doi, A.; Akiyama, K.; Honma, M.; Niinuma, K.; Casadio, C.; Orienti, M.; Krawczynski, H.; Gomez, J. L.; Sawada-Satoh, S.; Koyama, S.; Cesarini, A.; Nakahara, S.; Gurwell, M. A.
  • Journal Title: The Astrophysical Journal Volume: 788 Issue: 2 Pages: 165-177
  • DOI: 10.1088/0004-637x/788/2/165
  • Peer Reviewed / Open Access
• [Journal Article] Variable optical polarization during high state in gamma-ray loud, narrow-line Seyfert 1 galaxy 1H 0323+342 (2014)
  • Author(s): Itoh, R., Tanaka, Y. T., Akitaya, H., Uemura, M., Fukazawa, Y., Inoue, Y., Doi, A., Arai, A., Hanayama, H., Hashimoto, O., Hayashi, M., Izumiura, H., Kanda, Y., Kawabata, K. S., Kawaguchi, K., Kawai, N., Kinugasa, K., Kuroda, D., Miyaji, T., Moritani, Y. et al.
  • Journal Title: Publication of the Astronomical Society of Japan Volume: 66 Issue: 6 Pages: 108-108
  • DOI: 10.1093/pasj/psu095
  • Peer Reviewed / Open Access
• [Journal Article] Relativistic electrons and magnetic field of the M87 jet on ~ten Schwarzschild radii scale (2014)
  • Author(s): Kino, M.; Takahara, F.; Hada, K.; Doi, A.
  • Journal Title: The Astrophysical Journal Volume: in press
  • Peer Reviewed
• [Journal Article] Discovery of Sub- to Superluminal Motions in the M87 Jet: An Implication of Acceleration from Sub-relativistic to Relativistic Speeds (2014)
  • Author(s): Asada, Keiichi; Nakamura, Masanori; Doi, Akihiro; Nagai, Hiroshi; Inoue, Makoto
  • Journal Title: The Astrophysical Journal Letters Volume: Volume 781, Issue 1 Issue: 1 Pages: L2-L2
  • DOI: 10.1088/2041-8205/781/1/l2
  • Peer Reviewed
• [Journal Article] Evidence for a Nuclear Radio Jet and its Structure down to lsim100 Schwarzschild Radii in the Center of the Sombrero Galaxy (M 104, NGC 4594) (2013)
  • Author(s): Hada, K., Doi, A., Nagai, H., Inoue, M., Honma, M., Giroletti, M., Giovannini, G.
  • Journal Title: The Astrophysical Journal Volume: 779 Issue: 1 Pages: 6-18
  • DOI: 10.1088/0004-637x/779/1/6
  • Peer Reviewed
• [Journal Article] The Innermost Collimation Structure of the M87 Jet Down to ~10 Schwarzschild Radii (2013)
  • Author(s): Hada, K., Kino, M., Doi, A., Nagai, H., Honma, M., Hagiwara, Y., Giroletti, M., Giovannini, G., Kawaguchi, N.
  • Journal Title: The Astrophysical Journal Volume: 775 Issue: 1 Pages: 70-76
  • DOI: 10.1088/0004-637x/775/1/70
  • Peer Reviewed
• [Journal Article] A statistical relation between the X-ray spectral index and Eddington ratio of active galactic nuclei in deep surveys (2013)
  • Author(s): Brightman, M., et al.
  • Journal Title: Mon. Not. Royal Astron. Astrophysics Volume: 433 Issue: 3 Pages: 24852496-24852496
  • DOI: 10.1093/mnras/stt920
  • Peer Reviewed
• [Journal Article] The ordinary life of the γ-ray emitting narrow-line Seyfert 1 galaxy PKS 1502+036 (2013)
  • Author(s): D'Ammando, F.; Orienti, M.; Doi, A.; Giroletti, M.; Dallacasa, D.; Hovatta, T.; Drake, A. J.; Max-Moerbeck, W.; Readhead, A. C. S.; Richards, J. L.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: Volume 433, Issue 2 Issue: 2 Pages: 952-961
  • DOI: 10.1093/mnras/stt778
  • Peer Reviewed
• [Journal Article] Very Long Baseline Array Multi-frequency Polarimetric Imaging of Radio-loud Broad Absorption Line Quasars (2013)
  • Author(s): Hayashi, Takayuki J.; Doi, Akihiro; Nagai, Hiroshi
  • Journal Title: The Astrophysical Journal Volume: Volume 772, Issue 1 Issue: 1 Pages: 4-4
  • DOI: 10.1088/0004-637x/772/1/4
  • Peer Reviewed
• [Journal Article] Multifrequency VLBI Observations of the Broad Absorption Line Quasar J1020+4320: Recently Restarted Jet Activity? (2013)
  • Author(s): 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, Shoko
  • Journal Title: Publications of the Astronomical Society of Japan Volume: Vol.65, No.3
  • NAID: 40020043265
  • Peer Reviewed
• [Journal Article] Submillimeter H2O Maser in Circinus Galaxy―a New Probe for the Circumnuclear Region of Active Galactic Nuclei (2013)
  • Author(s): Hagiwara, Yoshiaki; Miyoshi, Makoto; Doi, Akihiro; Horiuchi, Shinji
  • Journal Title: The Astrophysical Journal Letters Volume: Volume 768, Issue 2 Issue: 2 Pages: L38-L38
  • DOI: 10.1088/2041-8205/768/2/l38
  • Peer Reviewed
• [Journal Article] VLBI Imagings of a Kilo-Parsec Knot in 3C 380 (2013)
  • Author(s): Koyama, S., Kino, M., Nagai, H., Hada, K., Kameno, S., Kobayashi , H.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 65 Issue: 2 Pages: 29-35
  • DOI: 10.1093/pasj/65.2.29
  • Peer Reviewed
• [Journal Article] The GENJI Programme: Gamma-Ray Emitting Notable AGN Monitoring by Japanese VLBI (2013)
  • Author(s): Nagai, Hiroshi; Kino, Motoki; Niinuma, Kotaro; Akiyama, Kazunori; Hada, Kazuhiro; Koyama, Shoko; Orienti, Monica; Hiura, Koichiro; Sawada-Satoh, Satoko; Honma, Mareki; Giovannini, Gabriele; Giroletti, Marcello; Shibata, Katsunori; Sorai, Kazuo
  • Journal Title: Publications of the Astronomical Society of Japan Volume: Vol.65, No.2
  • NAID: 40020043151
  • Peer Reviewed
• [Journal Article] The TeV blazar Markarian 421 at the highest spatial resolution (2013)
  • Author(s): Blasi, M. G.; Lico, R.; Giroletti, M.; Orienti, M.; Giovannini, G.; Cotton, W.; Edwards, P. G.; Fuhrmann, L.; Krichbaum, T. P.; Kovalev, Y. Y.; Jorstad, S.; Marscher, A.; Kino, M.; Paneque, D.; Perez-Torres, M. A.; Piner, B. G.; Sokolovsky, K. V.
  • Journal Title: Astronomy & Astrophysics Volume: Volume 559 Pages: A75-A75
  • DOI: 10.1051/0004-6361/201321858
  • Peer Reviewed
• [Journal Article] Active Galactic Nucleus and Extended Starbursts in a Midstage Merger VV 114 (2013)
  • Author(s): Iono, Daisuke; Saito, Toshiki; Yun, Min S.; Kawabe, Ryohei; Espada, Daniel; Hagiwara, Yoshiaki; Imanishi, Masatoshi; Izumi, Takuma; Kohno, Kotaro; Motohara, Kentaro; Nakanishi, Kouichiro; Sugai, Hajime; Tateuchi, Ken; Tamura, Yoichi; Ueda, Junko; Yoshii, Yuzuru
  • Journal Title: Publications of the Astronomical Society of Japan Volume: Vol.65, No.3
  • Peer Reviewed
• [Journal Article] Nuclear Radio Jet from a Low-luminosity Active Galactic Nucleus in NGC 4258 (2013)
  • Author(s): Doi, A., Kohno, K., Nakanishi, K., Kameno, S., Inoue, M., Hada, K., Sorai, K
  • Journal Title: The Astrophysical Journal Volume: Vol.765 Issue: 1 Pages: 63-63
  • DOI: 10.1088/0004-637x/765/1/63
  • Peer Reviewed
• [Journal Article] Very Long Baseline Array Imaging of Parsec-scale Radio Emissions in Nearby Radio-quiet Narrow-line Seyfert 1 Galaxies (2013)
  • Author(s): Doi, Nagai, Hagiwara, et al
  • Journal Title: Astrophysical Journal Volume: 765 Issue: 1 Pages: 69-69
  • DOI: 10.1088/0004-637x/765/1/69
  • NAID: 120005373241
  • Peer Reviewed
• [Journal Article] Multifrequency VLBI Observations of the Broad Absorption Line Quasar J1020+4320: Recently Restarted Jet Activity? (2013)
  • Author(s): Doi, Nagai, et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 65
  • NAID: 40020043265
  • Peer Reviewed
• [Journal Article] New Class of Very High Energy y-Ray Emitters: Radio-dark Mini Shells Surrounding Active Galactic Nucleus Jets (2013)
  • Author(s): Kino, et al.
  • Journal Title: Astrophysical Journal Volume: 764 Issue: 2 Pages: 134-139
  • DOI: 10.1088/0004-637x/764/2/134
  • Peer Reviewed
• [Journal Article] Radio and γ-ray follow-up of the exceptionallyhigh-activity state of PKS 1510-089 in 2011 (2013)
  • Author(s): Monika Orienti
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 428 Issue: 3 Pages: 2418-2429
  • DOI: 10.1093/mnras/sts201
  • Peer Reviewed
• [Journal Article] VLBI Imagings of Kilo-parsec Knot in 3C 380 (2013)
  • Author(s): Koyama, Kino, Nagai, Hada, et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 65
  • NAID: 40020043197
  • Peer Reviewed
• [Journal Article] The GENJI Programme: Gamma-Ray Emitting Notable AGN Monitoring by Japanese VLBI Program (2013)
  • Author(s): Nagai, Kino, Hada, et al
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 65
  • Peer Reviewed
• [Journal Article] VLBI Observations of the Jet in M 87 during the Very High Energy y-Ray Flare in 2010 April (2012)
  • Author(s): Hada, Kino, Nagai, Doi, Hagiwara, et al.
  • Journal Title: Astrophysical Journal Volume: 760 Issue: 1 Pages: 52-57
  • DOI: 10.1088/0004-637x/760/1/52
  • Peer Reviewed
• [Journal Article] 巨大ブラックホールは何処に?噴出ガス源流の隠れ家を突き止める (2012)
  • Author(s): 秦和弘
  • Journal Title: 天文月報 Volume: 105 Pages: 695-704
• [Journal Article] "Possible Detection of Apparent Superluminal Inward Motion in Markarian 421 after the Giant X-Ray Flare in 2010 February (2012)
  • Author(s): K. Niinuma, M. Kino, H. Nagai, N. Isobe, K. E. Gabanyi, K. Hada, S. Koyama, K. Asada, T. Oyama, and K. Fujisawa
  • Journal Title: Astrophysical Journal Volume: 759 Issue: 2 Pages: 84-84
  • DOI: 10.1088/0004-637x/759/2/84
  • Peer Reviewed
• [Journal Article] VLBI and single-dish monitoring of 3C 84 for the period 2009-2011 (2012)
  • Author(s): Nagai, Kino, Doi, et al.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 423
  • Peer Reviewed
• [Journal Article] Kiloparsec-scale Radio Structures 1n Narrow-line Seyfert 1 Galaxies (2012)
  • Author(s): Doi, Kino, Nagai, et al.
  • Journal Title: Astrophysical Journal Volume: 760 Issue: 1 Pages: 41-41
  • DOI: 10.1088/0004-637x/760/1/41
  • Peer Reviewed
• [Journal Article] Calorlmetry of Active Gaiactlc Xucleus Jets: Testing Plasma Composition ln Cygnus (2012)
  • Author(s): Kino, et al.
  • Journal Title: Astrophysical Journal Volume: 751 Issue: 2 Pages: 101-101
  • DOI: 10.1088/0004-637x/751/2/101
  • Peer Reviewed
• [Journal Article] VLBI and single-dish monitoring of 3C 84 for the period 2009-2011 (2012)
  • Author(s): Nagai, H., Orienti, M., Kino, M., Suzuki, K., Giovannini, G., Doi, A., Asada, K., Giroletti, M., Kataoka, J., D'Ammando, F., Inoue, M., Lähteenäki, A., Tornikoski, M., León -Tavares, J., Kameno, S., Bach, U
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: Vol.423 Issue: 1 Pages: L122-L126
  • DOI: 10.1111/j.1745-3933.2012.01269.x
  • Peer Reviewed
• [Journal Article] Physical properties of the nuclear region in Seyfert galaxies derived from observations with the European VLBI Network (2012)
  • Author(s): Bontempi, Doi, et al.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 426 Issue: 1 Pages: 588-594
  • DOI: 10.1111/j.1365-2966.2012.21786.x
  • Peer Reviewed
• [Journal Article] VLBA monitoring of Mrk 421 at 15 GHz and 24 GHz during 2011 (2012)
  • Author(s): Lico, Kino, et al.
  • Journal Title: Astronomy & Astrophysics Volume: 545 Pages: 117-125
  • DOI: 10.1051/0004-6361/201219870
  • Peer Reviewed
• [Presentation] Balloon-borne VLBI and space VLBI, to penetrate opaque regions toward black hole shadows (2017)
  • Author(s): Doi, Akihiro, et al
  • Organizer: Black Hole Astrophysics with VLBI: Past, Present, and Future
  • Place of Presentation: National Astronomical Observatory of Japan, Tokyo
  • Year and Date: 2017-03-27
  • Int'l Joint Research
• [Presentation] Disk-Jet Connection in Active Supermassive Black Holes (2017)
  • Author(s): 井上芳幸, 土居明広, 田中康之, Marek Sikora, Gregorz Madejski
  • Organizer: 日本天文学会2017年春季年会
  • Place of Presentation: 九州大学伊都キャンパス
  • Year and Date: 2017-03-15
• [Presentation] 位置天文で探るブレーザーMrk 501 のジェット軸から外れた構造の起源 (2016)
  • Author(s): 小山翔子, 紀基樹, 土居明広, 新沼浩太郎, 永井洋, 秦和弘, E. Ros, M. Giroletti, G. Giovannini, M. Orienti
  • Organizer: 日本天文学会2016年秋季年会
  • Place of Presentation: 愛媛大学城北キャンパス
  • Year and Date: 2016-09-14
• [Presentation] 電波銀河3C84 のシェルにおけるガンマ線、宇宙線生成について (2016)
  • Author(s): 紀基樹, 伊藤裕貴, 輪島清昭, 川勝望, M. Orienti, 永井洋, 伊藤亮介(
  • Organizer: 日本天文学会2016年秋季年会
  • Place of Presentation: 愛媛大学城北キャンパス
  • Year and Date: 2016-09-14
• [Presentation] ALMAサブミリ波偏波観測で探るCentaurus Aの質量降着流 (2016)
  • Author(s): 永井洋、浅田圭一、中村雅徳、中西康一
  • Organizer: 日本天文学会2016年秋季年会
  • Place of Presentation: 愛媛大学城北キャンパス
  • Year and Date: 2016-09-14
• [Presentation] 多周波 VLBI 観測による AGN NGC 4261 ジェット形状探査 (2016)
  • Author(s): 中原聡美, 土居明広, 村田泰宏, 秦和弘, 浅田圭一, 中村雅徳
  • Organizer: 日本天文学会2016年春季年会
  • Place of Presentation: 首都大学東京
  • Year and Date: 2016-03-14
• [Presentation] ALMA Observations of M87 and low-luminosity AGNs (2016)
  • Author(s): Akihiro Doi
  • Organizer: ALMA workshop "Ultra-High Resolution Observation with Phased-ALMA”
  • Place of Presentation: Mitaka campus of National Astronomical Observatory of Japan
  • Year and Date: 2016-01-13
  • Int'l Joint Research / Invited
• [Presentation] Exploring magnetic fields at the jet base of M87 (2016)
  • Author(s): Motoki Kino
  • Organizer: ALMA workshop "Ultra-High Resolution Observation with Phased-ALMA”
  • Place of Presentation: Mitaka campus of National Astronomical Observatory of Japan
  • Year and Date: 2016-01-13
  • Int'l Joint Research
• [Presentation] Recent VLBI Results of 3C84 and Prospects for mm VLBI with phased ALMA (2016)
  • Author(s): Hiroshi Nagai
  • Organizer: ALMA workshop "Ultra-High Resolution Observation with Phased-ALMA”
  • Place of Presentation: Mitaka campus of National Astronomical Observatory of Japan
  • Year and Date: 2016-01-13
  • Int'l Joint Research
• [Presentation] 多周波VLBIによるAGN NGC 4261のジェット収束形状探査 (2015)
  • Author(s): 中原聡美, 土居明広, 村田泰宏, 秦和弘, 浅田圭一, 中村雅徳
  • Organizer: 2015年度VLBI懇談会シンポジウム
  • Place of Presentation: 東洋大学
  • Year and Date: 2015-12-24
• [Presentation] EVN 及び VLBA を用いた M87 ジェットにおける活動的ノット HST-1 の 長期運動モニター (2015)
  • Author(s): 秦和弘, M. Giroletti, G. Giovannini, C. Casadio, J. L. Gomez, C. C. Cheung, 紀基樹, 永井洋, 土居明広
  • Organizer: 日本天文学会2015年秋季年会
  • Place of Presentation: 甲南大学
  • Year and Date: 2015-09-09
• [Presentation] 活動銀河におけるサブミリ波帯 H2O メーザー探査 II (2015)
  • Author(s): 萩原喜昭, 堀内真司, 土居明広, 三好真
  • Organizer: 日本天文学会2015年秋季年会
  • Place of Presentation: 甲南大学
  • Year and Date: 2015-09-09
• [Presentation] 3C 120: ブラックホールとγ線放射領域とジェット生成領域と電波コアの位置関係 (2015)
  • Author(s): 土居明広、田中康之、井上芳幸
  • Organizer: 日本天文学会
  • Place of Presentation: 国際基督教大学
  • Year and Date: 2015-03-19 – 2015-03-22
• [Presentation] VLBA+GBT＠86GHzによるM87ジェット生成領域の高分解能・高解像度 (2015)
  • Author(s): 秦和弘, 紀基樹, 永井洋, 本間希樹, 秋山和徳, 田崎文得, 萩原喜昭, 土居 明広, G.Giovannini, M.Giroletti
  • Organizer: 日本天文学会
  • Place of Presentation: 国際基督教大学
  • Year and Date: 2015-03-19 – 2015-03-22
• [Presentation] VERAによる低光度AGN M84の２周波(22,43 GHz)同時モニター観測 (2015)
  • Author(s): 中原聡美, 秦和弘, 本間希樹, 中西裕之, 土居 明広
  • Organizer: 日本天文学会
  • Place of Presentation: 国際基督教大学
  • Year and Date: 2015-03-19 – 2015-03-22
• [Presentation] M87ジェット最深部のサブミリ波放射領域における磁場強度 (2014)
  • Author(s): 紀基樹, 高原文郎, 秦和弘, 秋山和徳, 永井洋, B.W. Sohn
  • Organizer: 日本天文学会
  • Place of Presentation: 山形大学
  • Year and Date: 2014-09-11 – 2014-09-13
• [Presentation] ALMAで探る活動銀河核コロナ加熱機構 (2014)
  • Author(s): 井上芳幸、土居明広
  • Organizer: 日本天文学会
  • Place of Presentation: 山形大学
  • Year and Date: 2014-09-11 – 2014-09-13
• [Presentation] ALMAによるkpcジェットからのミリ波サブミリ波放射の検出 (2014)
  • Author(s): 永井洋, 紀基樹、小山翔子、Elisabetta Liuzzo
  • Organizer: 日本天文学会
  • Place of Presentation: 山形大学
  • Year and Date: 2014-09-11 – 2014-09-13
• [Presentation] M87における2012年TeV $\gamma$線活動に同期したブラックホール近傍数10シュバルツシルト半径以内からの強い電波増光の検出 (2014)
  • Author(s): 秦和弘, 永井洋, 秋山和徳, 本間希樹, 紀基樹, 土居明広, 新沼浩太郎, G.Giroletti, G.Giovannini, T.Cheung,M.Beilicke他
  • Organizer: 日本天文学会
  • Place of Presentation: 国際基督教大学
• [Presentation] VERAによる低光度AGN M84中心核の2周波(22,43GHz)同時観測 (2014)
  • Author(s): 中原聡美,秦和弘,本間希樹,中西裕之,土居明広
  • Organizer: 日本天文学会
  • Place of Presentation: 国際基督教大学
• [Presentation] GENJIプログラム:VLBIモニター観測による電波銀河3C 84の長期変動 (2014)
  • Author(s): 千田 華,永井 洋,本間希樹,西嶋恭司,ほか GENJIプログラムメンバー
  • Organizer: 日本天文学会
  • Place of Presentation: 国際基督教大学
• [Presentation] 超巨大ブラックホールと電波ジェット活動の関係 (2013)
  • Author(s): 土居明広
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 埼玉大学
  • Year and Date: 2013-03-22
• [Presentation] 多波長観測で探る中心エンジン・核周物質とジェットのトリガ (2013)
  • Author(s): 永井洋、土居明広
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 埼玉大学
  • Year and Date: 2013-03-22
• [Presentation] ALMA cycle-0 で捉えたソンブレロ銀河(M104)の超巨大質量ブラックホール周辺10シュバルツシルト半径付近からの電波放射 (2013)
  • Author(s): 土居明広、秦和弘
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 埼玉大学
  • Year and Date: 2013-03-21
• [Presentation] 多周波VLBA観測から分かるNGC 4261パーセクスケールジェットの形状 (2013)
  • Author(s): 羽賀崇史、土居明広、紀基樹
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 埼玉大学
  • Year and Date: 2013-03-21
• [Presentation] 電波銀河3C 84ジェットにおける二重稜線構造の発見 (2013)
  • Author(s): 永井洋,羽賀隆史,Monica Orienti,紀基樹,土居明広,秦和弘,浅田圭一,Gabriele Giovannini,Marcello Giroletti
  • Organizer: 日本天文学会
  • Place of Presentation: 東北大学
• [Presentation] M87ジェット最深部での磁場と相対論的電子のエネルギー密度比 (2013)
  • Author(s): 紀基樹, 高原文郎, 秦和弘,土居明広
  • Organizer: 日本天文学会
  • Place of Presentation: 東北大学
• [Presentation] 多周波位相補償VLBI観測によるソンブレロ銀河(M104, NGC4594)中心核100シュバルツシルト半径スケールの構造探査 (2013)
  • Author(s): 秦和弘, 土居明広, 永井洋, 井上允
  • Organizer: 日本天文学会
  • Place of Presentation: 東北大学
• [Presentation] TeVブレーザーMrk 421の静穏期における電波コアのふらつき探査 (2013)
  • Author(s): 新沼浩太郎, 紀 基樹, 土居明広, 小山翔子,秦 和弘, 永井 洋, Lico R.
  • Organizer: 日本天文学会
  • Place of Presentation: 東北大学
• [Presentation] VLBA-43GHzで捉えたブレーザーMrk 501のジェット深部の微細構造 (2013)
  • Author(s): 小山翔子,紀基樹,土居明広,永井洋,新沼浩太郎,秦和弘,M. Giroletti,G. Giovannini, M. Orienti
  • Organizer: 日本天文学会
  • Place of Presentation: 東北大学
• [Presentation] CTAで探るAGN低光度電波シェルからの超高エネルギーカンマ線放射 (2012)
  • Author(s): 紀基樹
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 大分大学
  • Year and Date: 2012-09-20
• [Presentation] 多周波VLBIによる電波銀河M87の中心エンジン近傍10-100シュバルツシルト半径領域におけるジェット形状探査 (2012)
  • Author(s): 秦和弘,紀基樹,永井洋,土居明広,萩原喜昭
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 大分大学
  • Year and Date: 2012-09-19
• [Presentation] ガンマ線フレーザーMrk 501の電波コア絶対位置ふらつき探索 (2012)
  • Author(s): 小山翔子、紀基樹、土居明広、永井洋、新沼浩太郎、秦和弘
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 大分大学
  • Year and Date: 2012-09-19
• [Presentation] 狭輝線セイファート1型銀河のカンマ線放射、キロパーセクスケール電波放射、ブラックホール質量の関連 (2012)
  • Author(s): 土居明広、紀基樹、永井洋
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 大分大学
  • Year and Date: 2012-09-19
• [Presentation] 活動銀河核ジェットの高エネルギー放射領域の探査とALMA偏光観測への展望 (2012)
  • Author(s): 永井洋
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 大分大学
  • Year and Date: 2012-09-19
• [Presentation] Mrk421のX線フレア時におけるVERAを用いたアストロメトリ観測 (2012)
  • Author(s): 新沼浩太郎、紀基樹、土居明広、秦和弘、小山翔子
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 大分大学
  • Year and Date: 2012-09-19
• [Presentation] GEN JIプログラム(II) : VERAを用いた高頻度活動銀河核ジェットモニター観測 (2012)
  • Author(s): 永井洋、紀基樹、新沼浩太郎、秦和弘、小山翔子
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 大分大学
  • Year and Date: 2012-09-19
• [Presentation] GEN JIプログラム:3C 454. 3の2010年11月のy線フレア後の電波帯での多周波ライトカーブ (2012)
  • Author(s): 秋山和徳、永井洋、紀基樹、新沼浩太郎、秦和弘、小山翔子
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 大分大学
  • Year and Date: 2012-09-19
• [Remarks] 記者発表：「視力５０万の瞳」が捉えたソンブレロ銀河の中心に潜む超巨大ブラックホールの周辺構造
  • URL: http://www.miz.nao.ac.jp/content/pr/pr20130909/c01
• [Remarks] Relativistic jets in AGNs 2013, 2013/11/22, 国立天文台
  • URL: http://vsop.mtk.nao.ac.jp/wikie/index.php?AGN2013