3月27日（水）14:00～15:00 アルマJセミナー ALMA棟 1F 会議室
Mar 27 Wed ALMAJ Semina Conference Room(109), ALMA Bldg. 1F
3月27日（水）15:00～16:00 VLBIコロキウム 中央棟(南)2階VLBIセミナー室
Mar 27 Wed VLBI Colloquium VLBI Seminar Room, Main Bldg. (South) 2F
詳細は以下をご覧下さい。
3月27日(水)
- キャンパス
- 三鷹
- セミナー名
- ALMAJ Seminar
- 臨時・定例の別
- 定例 (毎週水曜日の下記の時間)
- 日時
- 3月27日（水曜日）14:00～15:00
- 場所
- 国立天文台 ALMA棟 1F 会議室 (Room 109 1F of ALMA Bldg.)
- 講演者
- Eiji Akiyama (NAOJ)
- タイトル
- Radial Density Structure of Protoplanetary Disk: Power-Law Disk Model vs. Similarity Solution Disk Model
- Abstract
- With the recent advent of improved observational equipment and facilities, the observation of diffused gas near outer edge of the disk that used to be very difficult to observe has recently become possible. We made multi-CO line observations toward a well-known object, HD 31648 (MWC 480), in millimeter and sub-millimeter wavelengths by NRO 45 m and ASTE 10 m telescopes, and investigate the radial density structure near outer edge of the disk by comparing two disk models: the power-law disk model with truncation in the radial surface density distribution at a particular outer radius and the similarity solution disk model with a tapered outer edge. The emission from the tenuous gas in the outer disk that makes a peak-to-peak velocity width narrower was detected in the optically thick line, whereas the emission from the dense inner disk that makes the width wider was detected in the optically thin line. As a result of comparison between both disk models, the observed profiles sh ow a good agreement with the ones derived by the similarity solution disk model. It indicates that the disk gas extends and gradually tapers off. It is consistent with the model fitting results improved by the similarity solution disk model toward other star+disk systems, such as HD 163296 and GM Aurigae in the continuum and molecular gas observations. Although it requires further validation, it seems that the tapered outer edge structure is ubiquitous in protoplanetary disks.
- 連絡先
- 名前：西合一矢
- 備考
- テレビ参加：可能
- キャンパス
- 三鷹
- セミナー名
- VLBIコロキウム
- 臨時・定例の別
- 定例 (毎週水曜日の下記の時間)
- 日時
- 3月27日（水曜日）15:00～16:00
- 場所
- 中央棟(南)2階VLBIセミナー室
- 講演者
- 坂井 伸行
- 所属
- 総研大
- タイトル
- Absolute Proper Motion of IRAS 00259+5625 Away from the Galactic Plane Measured with VERA in a Galactic Superbubble Region
- Abstract
-
We present the first measurement of the absolute proper motion of IRAS00259+5625 (CB3, LBN594) with
VERA. The proper motion is ( mu_alpha *cos_delta , mu_delta ) = (－2.73+/-0.45, －2.97+/-0.50) mas yr−1, yielding non-circular southwest
motion away from the Galactic plane with a vertical velocity (vb) of －19.0(+7.1/−13.2) km s−1 at marginally measured
source distance of 2.4(+1.0/−0.6) kpc. The non-circular motion is consistent with previous VLBI result for NGC
281 (Sato, et al. 2008). Both sources are associated with same HI loop called by “Galactic superbubble”, extended
from the Galactic plane toward z ~ －300 pc in Galactic north polar direction. The origin of the structure has
been believed to be sequential supernova explosions, which is supported by two independent VLBI observations. In
addition, dynamical timescale as Δz / Δvb is determined to be 8-25 Myr for IRAS 00259+5625, which is almost
consistent with a MHD simulation result in Tomisaka (1998). - 連絡先
- 名前：MIN CHEULHONG
- 備考
- テレビ参加：可能
以上