10月20日（火）13：30～15：00 太陽系小天体セミナー zoom
Oct 20 Tue Solar System Minor Body Seminar
10月21日（水）13：30～15：00 NAOJ Science Colloquium zoom
Oct 21 Wed
10月21日（水）15：00～16：00 ALMA-J seminar zoom
Oct 21 Wed
詳細は以下をご覧下さい。
10月20日（火）
- キャンパス
- 三鷹
- セミナー名
- 太陽系小天体セミナー
- 定例・臨時の別
- 定例
- 日時
- 10月20日（火曜日）13時30分～15時
- 場所
- zoom
- 講演者
- 大坪貴文
- 連絡先
- 名前：渡部潤一
- 備考
- テレビ会議またはスカイプによる参加も可
10月21日（水）
- Campus
- Mitaka
- Seminar
- NAOJ Science Colloquium
- Regularly Scheduled/Sporadic
- Every Wednesday
- Date
- 2020 October 21
- Time
- 13:30-15:00
- Place
- Zoom
- Speaker
- Christophe Pinte (Monash Univ.)
- Title
- Observing Planet Formation
- Abstract
- We still do not understand how planets form, or why extra-solar planetary systems are so different from our own solar system. Recent observations of protoplanetary discs have revealed rings and gaps, spirals and asymmetries. These features have been interpreted as signatures of newborn protoplanets, but the exact origin is unknown, and remained until recently poorly constrained by direct observation. In this talk, I will illustrate how high spatial and spectral resolution ALMA observations can be used to detect embedded planet in their discs, and discuss the implications on our understanding of planet formation.
NAOJ Science Colloquium Home page: - Facilitator
- -Name：Akimasa Kataoka
10月21日（水）
- Campus
- Mitaka
- Seminar
- ALMA-J seminar
- Regularly Scheduled/Sporadic
- Every Wednesday
- Date and time
- 2020 Oct 21 15:00-16:00
- Place
- Zoom
- Speaker
- Seiji Kameno
- Affiliation
- NAOJ Chile
- Title
- A massive molecular torus in the radio galaxy NGC 1052
- Abstract
- Active galactic nuclei (AGNs) are considered to host a pc-scale molecular torus that would be a reservoir of accretion mass and that perhaps causes type-1/2 dichotomy in AGN classification. Recent ALMA observations toward nearby AGNs unveil physical, chemical, and dynamical properties of molecular tori. Here I report molecular absorption-line study of the molecular torus in the radio galaxy, NGC 1052. We detected CO, HCN, HCO+, SO, SO2, CS, CN, and H2O, with H13CN and HC15N and vibrationally excited (V2 = 1) HCN and HCO+. Using optical depths, velocity widths, and 12C-to-13C ratio, we derived parameters of the torus: radius = 2.4 ± 1.3 pc, covering factor = 0.17+0.06-0.03, H2 column density = (3.3 ± 0.7) e25 cm-2, H2 number density in clumps = (6.4 ± 1.3) × 107 cm-3, and the total gas mass = (1.3 ± 0.3) × 107 M☉. I’ll present that absorption-line studies in radio galaxies bring us rich information.
- Facilitator
- Daisuke Iono, Andres Guzman