The Nuclear Dynamics in Nearby Galaxies with Radio Interferometry

2010 Fiscal Year Final Research Report

• Project/Area Number: 20740108
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Astronomy
• Research Institution: Yamaguchi University
• Principal Investigator: SAWADA Satoko Yamaguchi University, 水沢VLBI観測所, 研究員 (00452631)
• Project Period (FY): 2008 – 2010
• Keywords: 電波天文学 / 銀河 / 活動銀河核 / 質量降着

Research Abstract

This research aims at revealing the mass accretion process from galactic scale into a black hole, obtaining the gas dynamics in the galactic nuclear region of galaxies with the interferometry and VLBI. Our observations reveal CO velocity fields within the inner 1kpc of nearby galaxies NGC1097 and Arp220, which show the different rotation axis and velocity from those of their galactic rotation. Our VLBI observations toward the center of Arp220 detected a compact source in 1pc scale with high brightness temperature (>10^6K), and it suggests the existence of active galactic nucleus. Furthermore, our VLBI observations toward the nuclear region of an elliptic galaxy NGC1052 imply that water masers are associated with a circumnuclear plasma torus and such circumnuclear structure could be the source of accretion onto the central engine. We carried out the surveys towards AGN and galaxies as new tracers, and showed no detection.

Research Products

• [Journal Article] Annual Parallax Measurements of an Infrared Dark Cloud MSXDC G034.43+00.24 with VERA (2011)
  • Author(s): Kurayama, T., Nakagawa, A., Sawada-Satoh, S., Sato, K., Honma, M., Sunada, K., Hirota, T., Imai, H.
  • Journal Title: Publications of the Astronomical Society of Japan 63 Pages: 513-525
  • Peer Reviewed
• [Journal Article] Internal Proper Motions of Methanol Masers at 6.7GHz in Massive Star-Forming Region Onsala 1 (2011)
  • Author(s): Sugiyama, K., Fujisawa, K., Doi, A., Honma, M., Isono, Y., Kobayashi, H., Mochizuki, N., Murata, Y., Sawada-Satoh, S., Wajima, K.
  • Journal Title: Publications of the Astronomical Society of Japan 63 Pages: 53-61
  • Peer Reviewed
• [Journal Article] SMA 12CO(J=6-5) and 435 um Interferometric Imaging of the Nuclear Region of Arp 220 (2009)
  • Author(s): Matsushita, S., Iono, D., Petitpas, G.R., Chou, R.C.-Y., Gurwell, M.A., Hunter, T.R, Muller, S., Lim J., Peck, A.B., Sakamoto, K., Sawada-Satoh, S., Wiedner, M.C., Wilner, D.J., Wilson, C.D.
  • Journal Title: The Astrophysical Journal 693 Pages: 56-68
  • Peer Reviewed
• [Journal Article] H_2O maser and a plasma obscuring torus in the radio galaxy NGC 1052 (2009)
  • Author(s): Sawada-Satoh, S., Kameno, S., Nakamura, K.Namikawa, D., Shibata, K.M., Inoue, M.
  • Journal Title: Astronomische Nachrichten 330 Pages: 249-252
  • Peer Reviewed
• [Journal Article] Interferometric 12CO J=2-1 Image of the Nuclear Region of Seyfert 1 Galaxy NGC 1097 (2008)
  • Author(s): Hsieh, P.-Y., Matsushita, S., Lim, J., Kohno, K., Sawada-Satoh, S.
  • Journal Title: The Astrophysical Journal 683 Pages: 70-77
  • Peer Reviewed
• [Journal Article] Positional Coincidence of H_2O Maser and a Plasma-Obscuring Torus in Radio Galaxy NGC 1052 (2008)
  • Author(s): Sawada-Satoh, S., Kameno, S., Nakamura, K.Namikawa, D., Shibata, K.M., Inoue, M.
  • Journal Title: The Astrophysical Journal 680 Pages: 191-199
  • Peer Reviewed
• [Presentation] Methanol Maser Outfolws of UCHII Region S269 (2010)
  • Author(s): Sawada-Satoh, S.
  • Organizer: Great Barriers in High Mass Star Formation
  • Place of Presentation: Townsville, Australia
  • Year and Date: 20100913-20100917
• [Presentation] AGN における22GHz アンモニア吸収線VLBI 観測 (2010)
  • Author(s): 澤田-佐藤聡子
  • Organizer: 大学VLBI連携・東アジアVLBI 観測網ワークショップ
  • Place of Presentation: 山口大学、山口
  • Year and Date: 2010-11-12
• [Presentation] KVN による AGN 周囲の分子トーラス (2010)
  • Author(s): 澤田-佐藤聡子
  • Organizer: ミニワークショップ:KVN-山口アレイで狙うサイエンス
  • Place of Presentation: 山口大学、山口
  • Year and Date: 2010-03-16
• [Presentation] 高分解能サブミリ波マッピングによる近傍銀河の 100pc スケール動力学:銀河円盤と中心核円盤のミッシングリンク (2009)
  • Author(s): 澤田-佐藤聡子
  • Organizer: NRO ワークショップ:高精度ミリ波・サブミリ波観測と最新理論モデルによる近傍銀河の構造の解明
  • Place of Presentation: 鹿児島大学、鹿児島
  • Year and Date: 20091117-20091118
• [Presentation] 山口32m 望遠鏡による局部銀河群内の6.7GHz メタノールメーザー源探査 (2009)
  • Author(s): 澤田-佐藤聡子
  • Organizer: 日本天文学会
  • Place of Presentation: 大阪府立大学、大阪
  • Year and Date: 20090324-20090327
• [Presentation] Imaging of 6.7 GHz Methanol Maser Source S 269 with the Japanese VLBI Network (2009)
  • Author(s): Sawada-Satoh, S.
  • Organizer: 2009 East Asia VLBI Workshop.
  • Place of Presentation: 梨花女子大学校, ソウル, 韓国
  • Year and Date: 20090318-20090320
• [Presentation] Extragalactic Methanol Maser (2008)
  • Author(s): Sawada-Satoh, S.
  • Organizer: East Asia VLBI Mini Workshop Science of the methanol maser.
  • Place of Presentation: 上海天文台、中国
  • Year and Date: 20081025-20081026
• [Presentation] VSOP-2 で追う近傍AGN の質量降着過程 (2008)
  • Author(s): 澤田-佐藤聡子
  • Organizer: 国立天文台ワークショップ:超高分解能で見る星間メーザー
  • Place of Presentation: 宇宙航空研究開発機構、宇宙科学研究本部、神奈川
  • Year and Date: 20080930-20081001
• [Presentation] Imaging of 6.7 GHz Methanol Maser Sources with the Japanese VLBI Network (2008)
  • Author(s): Sawada-Satoh, S.
  • Organizer: The 9th European VLBI Network.
  • Place of Presentation: INAF, Bologna, Italy
  • Year and Date: 20080923-20080926
• [Presentation] H2O maser and a plasma obscuring torus in the radio galaxy NGC 1052 (2008)
  • Author(s): Sawada-Satoh, S.
  • Organizer: The 4th CSS/GPS Workshop.
  • Place of Presentation: Riccione, Italy
  • Year and Date: 20080526-20080529
• [Presentation] 山口32m 望遠鏡による局部銀河群内の6.7GHz メタノールメーザー源探査II
  • Author(s): 澤田-佐藤聡子
  • Organizer: 日本天文学会2011年春季年会予稿
  • Place of Presentation: 筑波大学(開催中止)