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2016.5.16-5.22

5月16日(月)13:30~15:30  太陽系科学セミナー    輪講室
May 16 mon          Solar System Science Seminar      Rinkoh Seminar Room

5月18日(水)10:30~12:00  総研大コロキウム    中央棟(北)1F講義室
May 18 wed         SOKENDAI colloquium   Lecture Room

5月18日(水)13:30~14:30  理論コロキウム すばる棟 大セミナー室
May 18 wed          DTA colloquium   Large Seminar Room, Subaru Building

5月19日(木)15:00~16:00  VLBIコロキウム 中央棟(南)2階VLBIセミナー室
May 19 Thu          VLBI Colloquium   VLBI Seminar Room, Main Bldg. (South) 2F

5月20日(金)16:00~17:00  国立天文台談話会 大セミナー室
May 20 Fri         NAOJ Seminar  Large Seminar Room

詳細は以下をご覧下さい。

5月16日(月)

キャンパス
三鷹
セミナー名
太陽系科学セミナー
定例・臨時の別
定例
日時
5月16日(月曜日)13時30分~15時30分
場所
輪講室
講演者
伊藤孝士
タイトル
「第9惑星」の存在を予見したと主張する論文の紹介
Abstract
いわゆる「第9惑星」の存在を予見したと言う論文の紹介。主論文
http://dx.doi.org/10.3847/0004-6256/151/2/22
およびこれに関連する
http://dx.doi.org/10.1051/0004-6361/201628227
http://dx.doi.org/10.1016/j.icarus.2013.10.030
の内容を紹介する。

連絡先
-名前:脇田茂,松本晃治,土屋智恵

備考
テレビ会議またはスカイプによる参加も可

5月18日(水)

Campus
Mitaka
Seminar Name : SOKENDAI colloquium
Regular / Irregular : Regular
Date:10:30-12:00, May18,2016
Place
Lecture Room
Speaker 1 : Rhythm Shimakawa
Affiliation
D3, SOKENDAI (supervisor : Tadayuki Kodama)
Title
Science cases based on narrow-band data with HSC-SSP
Abstract
In this talk, I will describe how to find distant galaxies up to z~1.7 by capturing the unique spectral features by narrow-band filters based on the HSC-SSP data. I will then present some actual examples of narrow-band selected galaxies (Hα, [OIII], [OII] emitters) and Balmer break galaxies at 0.4<z<1.5. I will discuss some science cases based on these unique statistical samples, and report some on-going analyses.

Speaker 2:Satoshi Kikuta

Affiliation
M2, SOKENDAI (supervisor :Masatoshi Imanishi)
Title
AGN feedback to neighbouring galaxy formation
Abstract
While feedback from active galactic nuclei (AGNs) is now considered to be an essential ingredient of the process of galaxy formation, the importance of AGN feedback to surrounding other galaxies is observationally unclear, although theoretically often expected to be at work especially to low-mass ones by heating the gas. To test whether QSO’s radiative feedback is indeed strong enough to suppress the formation of neighboring low-mass galaxies, we have conducted a deep and wide field imaging observation with the Suprime-Cam on the Subaru telescope and searched for Lyman alpha emitters (LAEs) around QSOs at z~4.86 by using a narrow band filter. We compared the shape of luminosity functions of LAEs in the proximity of QSOs (the zone strongly affected by QSO’s UV radiation) and in the blank fields where the influence of QSO radiation is negligible to find no clear difference even in the faintest luminosity bin where the feedback effect is expected to become the strongest. Our results suggests that i) the QSO radiative feedback does not affect LAE formation because LAEs have already formed before QSOs turned on and/or duration of the QSO phase is too short, ii) we have to go deeper to witness feedback at work, or iii) the size of the QSO proximity is too large or too small compared to S-Cam FoV. We’ll also provide future prospects of this study using the Hyper Suprime-Cam.
Organizer
Facilitator
Name : Kotomi Taniguchi
Comment

TV conference system is available connecting from Nobeyama, Hawaii,
Mizusawa, and Okayama.

5月18日(水)

Campus
Mitaka
Seminar
DTA colloquium
Regularly Scheduled/Sporadic
Regularly Scheduled Date and time:18 May 2016, 13:30-14:30
Place
Large Seminar Room, Subaru Building
Speaker
Takashi Moriya
Affiliation
NAOJ DTA
Title
Superluminous supernovae and their origins
Abstract
Superluminous supernovae (SLSNe) are newly recognized class of core-collapse supernovae (SNe). Their existence is realized only about a decade ago. They are more than 10 times brighter than other core-collapse SNe. The reasons why they can become very bright are still not understood well. It is currently known that there are two distinct spectral types in SLSNe, namely, Type II (those with hydrogen features) and Type I (those without them). Type II SLSNe show narrow spectral features which are likely from dense circumstellar media surrounding the SN ejecta. I will present the numerical modeling of the collision between SN ejecta and dense circumstellar media and show that the interaction between SN ejecta and dense circumstellar media can indeed explain Type II SLSNe. Origins of Type I SLSNe are more mysterious. I will discuss several works of mine related to the luminosity source of Type I SLSNe. I will especially focus on the Type I SLSN iPTF13ehe which did not show hydrogen features at the beginning but started to show them one year after its luminosity peak. I suggest that the delayed hydrogen features may be an evidence of Type I SLSN progenitors evolving in close massive binary systems.
Facilitator
-Name:Tomoya Takiwaki

Comment
in English=

5月19日(木)

キャンパス
三鷹
セミナー名
VLBIコロキウム
定例・臨時の別
定例
日時
5月19日(木曜日)15時 ~16時
場所
中央棟(南)2階VLBIセミナー室
講演者
Jeong-Sook Kim
所属
VERA
タイトル
Traget-of-Opportunity(ToO) observations with KaVA for Cyg X-3 in 2016
Abstract
Cyg X-3 is a jet-ejecting X-ray binary(“micriquasar”), consisting of a relativistic star,an accretion disk around it and its unusual companion, Wolf-Rayet star. the nature of compact object is unknow with a high possibility of a black hole. Cyg X-3 has displayed a verity of frequent radio flares with no real quescence. Relativistic jets are ubiquitous,almost accompanied with flares, closely engaged with magnetic field, disk and hot flow around the compact object. Due to sudden, rapid flare evolution form a rise to peak (a few days to a weak), only a handful of VLBI observations have been successfully performed with Target-of-Opportunity(ToO) observations.
Based on two ATEL reports from Fermi/LAT and AGILE on last January 26, we carried out To Oobservations with KaVA and KVN single dish. Therefore, I will brielfly show you our progress for The ToO observation of Cyg X-3 in 2016.
連絡先
-名前:倉持一輝

備考
英語、テレビ参加可

5月20日(金)

キャンパス
三鷹
セミナー名
国立天文台談話会
定例・臨時の別
定例
日時
5月20日(金) 16:00-17:00
場所
大セミナー室
講演者
Kipp Cannon
所属
RESCUE, University of Tokyo
タイトル
“Latest Results From Advanced LIGO’s First Science Run”
Abstract
I will discuss some of the conclusions drawn from the observations of gravitational waves from binary black hole collisions during Advanced LIGO’s first science run, and speculate about what future observations might hold.
連絡先
-名前: 松田 有一

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