Home > ALMA Jセミナー | 太陽系小天体セミナー > 2020.12.14-2020.12.20

2020.12.14-2020.12.20

12月15日(火)13:30~15:00   太陽系小天体セミナー                zoom
Dec 15 Tue   Solar System Minor Body Seminar

12月16日(水)15:00~16:00   ALMA-J seminar                   zoom
Dec 16 Wed 

詳細は以下をご覧下さい。

12月15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
12月15日(火曜日)13時30分~15時
場所
zoom
講演者
匠あさみ
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

12月16日(水)

Campus
Mitaka
Seminar
ALMA-J seminar
Regularly Scheduled/Sporadic
Every Wednesday
Date and time
2020 Dec 16 15:00-16:00
Place
Zoom
Speaker
Takuma Izumi
Affiliation
NAOJ
Title
ALMA Observations of Multiple CO and C Lines toward the Active Galactic Nucleus of NGC 7469: An X-ray Dominated Region Caught in the Act
Abstract
We used the ALMA to map multiple 12CO, 13CO and C emission lines around the type-1 active galactic nucleus (AGN) of NGC 7469 at ~100 pc resolutions.
The CO lines are bright in both the circumnuclear disk (central ~300 pc) and the surrounding prominent starburst (SB) ring (~1 kpc diameter).
By contrast, [CI](1-0) line is strongly peaked at the AGN.
Consequently, we found strikingly different brightness temperature ratios between the AGN and the SB ring, for example,
[CI](1-0)/13CO(2-1) is ~20 at the AGN and ~2 at the SB ring.
Our local thermodynamic (LTE) and non-LTE analyses indicate that the enhanced line ratios (or CI-enhancement) are due to an elevated C/CO abundance ratio and temperature around the AGN as compared to the SB ring.
This accords well with the picture of the X-ray dominated region (XDR), which can be formed around an AGN.
Our results suggest that the CI-enhancement is potentially a good marker of AGNs that could be used in a new submm energy diagnostic method toward dusty environments.
I will also briefly discuss our on-going efforts for future programs, including ALMA cycle 8 and the coming ngVLA.
Facilitator
:
Daisuke Iono, Andres Guzman

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