Development of new imaging tehchnique for sub-mm VLBI

• Project/Area Number: 24540242
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: National Astronomical Observatory of Japan
• Principal Investigator: HONMA Mareki 国立天文台, 水沢VLBI観測所, 教授 (20332166)
• Co-Investigator(Renkei-kenkyūsha): NAGAI Hiroshi 国立天文台, チリ観測所, 特任准教授 (00455198) ; OYAMA Tomoaki 国立天文台, 水沢VLBI観測所, 専門研究職員 (70425403) ; KAWABE Ryohei 国立天文台, 電波研究部, 教授 (10195141)
• Research Collaborator: AKIYAMA Kazunori ; TAZAKI Fumie ; HADA Kazuhiro
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: ブラックホール / 活動銀河中心核 / 電波天文学 / 超長基線電波干渉計 / サブミリ波 / イメージング / 国際情報交換：アメリカ合衆国 / 国際情報交換（米国）

Outline of Final Research Achievements

In order to realize imaging with sub-mm VLBI using visibility phase information, we have explored imaging technique based on simulation data as well as real observational data of mm-VLBI. The methods we have considered include model fitting with least-square method, model estimation with Markov Chain Monte Carlo method, compressive sensing and so on. We have applied these methods to the real data of mm-VLBI observations, and for the first time successfully detected the radio core of M87 at 1 mm with a size of 5.5 Schwarzschild radii and also closure phase information on M87, which leaded us one step closer to the direct imaging of black hole shadows with sub-mm VLBI.

Research Products

• [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] Super-resolution imaging with radio interferometry using sparse modeling (2014)
  • Author(s): Honma, Mareki ; Akiyama, Kazunori ; Uemura, Makoto ; Ikeda, Shiro
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 66 Issue: 5 Pages: 95-95
  • DOI: 10.1093/pasj/psu070
  • Peer Reviewed / Open Access
• [Journal Article] Microarcsecond Radio Astrometry (2014)
  • Author(s): Reid, M. J.; Honma, M.
  • Journal Title: Annual Review of Astronomy and Astrophysics Volume: 52 Issue: 1 Pages: 339-372
  • DOI: 10.1146/annurev-astro-081913-040006
  • Peer Reviewed / 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] A Hot Molecular Circumstellar Disk around the Massive Protostar Orion Source I (2014)
  • Author(s): Hirota T., Kim MK., Kurono Y., Honma M.
  • Journal Title: The Astrophysical Journal Letters Volume: 782 Issue: 2 Pages: L28-L28
  • DOI: 10.1088/2041-8205/782/2/l28
  • 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] Multi-Epoch VERA Observations of Sagittarius A*. I. Images and Structural Variability (2013)
  • Author(s): Akiyama, K., Takahashi, R., Honma, M., Oyama, T., and Kobay ashi, H.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 65 No.4 Issue: 4 Pages: 13-13
  • DOI: 10.1093/pasj/65.4.91
  • Peer Reviewed
• [Journal Article] X-Ray and Radio Follow-up Observations of High-redshift Blazar Candidates in the Fermi-LAT Unassociated Source Population (2013)
  • Author(s): Takahashi Y., Kataoka J., Niinuma K., Honma M., Inoue Y., Totani T., Inoue S., Nakamori T.,;Maeda K.
  • Journal Title: The Astrophysical Journal Volume: 773 Issue: 1 Pages: 36-36
  • DOI: 10.1088/0004-637x/773/1/36
  • Peer Reviewed
• [Journal Article] Fine-scale Structure of the Quasar 3C 279 Measured with 1.3 mm Very Long Baseline Interferometry (2013)
  • Author(s): Lu, R., Fish, V., Akiyama, K., Doeleman, S., Algaba, J., Bower, G., Brinkerink, C., Chamberlin, R., Crew, G., Cappallo, R., Dexter, M., Freund, R., Friberg, P., Gurwell, M., Ho, P., Honma, M., et al
  • Journal Title: The Astrophysical Journal Volume: 772 Issue 1 Issue: 1 Pages: 10-10
  • DOI: 10.1088/0004-637x/772/1/13
  • Peer Reviewed
• [Journal Article] Multifrequency VLBI Observations of the Broad Absorption Line Quasar J1020+4320: Recently Restarted Jet Activity? (2013)
  • Author(s): Doi A., Murata Y., Mochizuki N., Takeuchi H., Asada K., Hayashi TJ., Nagai H., Shibata KM., Oyama T., Jike T., et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 65 Issue: 3
  • DOI: 10.1093/pasj/65.3.57
  • Peer Reviewed
• [Journal Article] Jet launching structure resolved near the supermassive black hole in M87 (2012)
  • Author(s): Doeleman S. S., Fish V., Schenck D. E., Beaudoin C., Blundell R., Bower G. C., Broderick A. E., Chamberlin R., Freund R., Friberg P., Gurwell M. A., Ho P. T. P., Honma M., et al.
  • Journal Title: Science Volume: 338 Issue: 6105 Pages: 355-358
  • DOI: 10.1126/science.1224768
  • 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] Resolving the Inner Jet Structure of 1924-292 with the Event Horizon Telescope (2012)
  • Author(s): Lu R. S., Fish V. L., Weintroub J., Doeleman S. S., Bower G. C., Freund R., Friberg P., Ho P. T. P., Honma M., et al.
  • Journal Title: Astrophysical Journal Volume: 757 Issue: 1 Pages: L14-L14
  • DOI: 10.1088/2041-8205/757/1/l14
  • Peer Reviewed
• [Journal Article] Fundamental Parameters of the Milky Way Galaxy based on VLBI Astrometry (2012)
  • Author(s): Honma M., Nagayama T., Ando K., Bushimata T., Choi Y. K., et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 64
  • NAID: 10031146610
  • Peer Reviewed
• [Presentation] Super-resolution imaging with sparse modeling (2014)
  • Author(s): Honma, M.
  • Organizer: Event Horizon Telescope 2014
  • Place of Presentation: Perimeter Institute, Waterloo, Canada
  • Year and Date: 2014-11-14
  • Invited
• [Presentation] Maser Astrometry with VLBI and Galactic Structure (2014)
  • Author(s): Honma, M.
  • Organizer: 12th European VLBI Network Symposium
  • Place of Presentation: Hotel Regina Margherita, Cagliari, Italy
  • Year and Date: 2014-10-10
  • Invited
• [Presentation] 圧縮センシングを用いた電波干渉計のイメージング (2012)
  • Author(s): 本間 希樹
  • Organizer: 日本天文学会
  • Place of Presentation: 大分大学（大分県）
• [Remarks] サブミリ波ＶＬＢＩ
  • URL: http://www.miz.nao.ac.jp/sbumilli/top
• [Remarks] サブミリ波VLBI
  • URL: http://www.miz.nao.ac.jp/submilli/top