2月15日（月）13：30～15：00 太陽系小天体セミナー 南棟2階会議室
Feb 15 Mon Solar System Minor Body Seminar Conference Room, South Bldg.2F
2月15日（月）15：30～16：30 国立天文台談話会 コスモス会館会議室
Feb 15 Mon NAOJ Seminar Conference Room, Cosmos Lodge
2月17日（水）10：00～12：00 総研大コロキウム 中央棟（北）1F講義室
Feb 17 Wed SOKENDAI colloquium Lecture Room
2月17日（水）14：10～15：10 理論コロキウム コスモス会館会議室
Feb 17 Wed DTA Colloquium Conference Room, Cosmos Lodge
2月17日（水）16：30～17：30 国立天文台談話会 中央棟（北）1F講義室
Feb 17 Wed NAOJ Seminar Lecture Room
2月19日（金）13：30～15：00 太陽天体プラズマセミナー 院生セミナー室
Feb 19 Fri Solar and Space Plasma (SSP) Seminar Student Seminar Room, Subaru bldg.
2月19日（金）16：00～17：00 国立天文台談話会 大セミナー室
Feb 19 Fri NAOJ Seminar Large Seminar Room
詳細は以下をご覧下さい。
2月15日(月)
- 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
- 2月15日（月曜日）13時30分～15時
- 場所
- 南棟２階会議室
- 講演者
- 佐藤幹哉・塚田健
- 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
2月15日(月)
- 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
- 臨時
- 日時
- 2月15日（月） 15:30-16:30
- 場所
- コスモス会館会議室
- 講演者
- Raffaele Flaminio
- 所属
- NAOJ
- タイトル
- Status report on the efforts to detect gravitational waves with the Advanced LIGO detectors.
- Abstract
- The first observation run of the two Advanced LIGO detectors at Hanford, WA and Livingston, LA started in September 2015 and ended on January 12th, 2016. The data were analyzed jointly by a global group of scientists, including the LIGO Scientific Collaboration, which includes the GEO600 Collaboration, and the VIRGO Collaboration. In this seminar I will present the results obtained during the first part of the observation run.
- 連絡先
- -名前：田中 雅臣
2月17日(水)
- Campus
- Mitaka
- Seminar
- SOKENDAI Colloquium
- Regularly Scheduled/Sporadic
- Regularly Scheduled
- Date and time
- 10:00 – 12:00, Feb 17, 2016
- Place
- Lecture Room
- Speaker1
- Haruka BABA
- Affiliation
- D1, SOKENDAI
- Title
- (TBA)
- Speaker2
- Tomoko SUZUKI
- Affiliation
- D2, SOKENDAI (supervisor: Tadayuki Kodama)
- Title
- Can [OIII] emission line be a good tracer of star-forming galaxies at high redshifts?
- Abstract
- We investigate the global physical properties of z=2.23 H-alpha and [OIII] emitters using the narrow-band-selected samples obtained through the High-z Emission Line Survey (HiZELS). We construct two samples of H-alpha and [OIII] emitters and compare their global physical properties. We find that the number distribution of stellar masses, dust extinction, SFRs, and specific SFRs, is not statistically different between the two samples. Our results suggest that sources with strong [OIII] emission line tend to have relatively high star-forming activities and/or low metallicities among all galaxies that we study. We argue that [OIII] emission line can be a good tracer of star-forming galaxies at high redshift, and that it is useful to investigate star-forming galaxies at z>3, where H-alpha emission is no longer observable from the ground.
- Speaker3
- Gabriel GIONO
- Affiliation
- D3, SOKENDAI (supervisor: Suematsu Yoshinori)
- Title
- In-flight results and final conclusion on the polarization calibration of the Chromospheric Lyman-Alpha Spectro-Polarimeter
- Abstract
- In this talk, the global goal of the CLASP instrument and the results of its pre-flight polarization calibration are reminded as an introduction. The results obtained during the flight on September 3rd 2015 are presented, and used to perform an in-flight polarization calibration. Both the pre-flight and in-flight polarization calibration are compared, and conclusion on the final response matrix of the instrument are shown in the final part of the presentation.
- Facilitator
- -Name：Ryosuke Nagasawa
- Comment
- TV conference connection is available from Hawaii, Nobeyama, Mizusawa and Okayama.
2月17日(水)
- Campus
- Mitaka
- Seminar
- DTA colloquium
- Regularly Scheduled/Sporadic
- Regularly Scheduled
- Date and time
- 17 FEB 2016, 14:10-15:10
- Place
- Conference Room, Cosmos Lodge
- Speaker
- Nobumitsu Yokoi
- Affiliation
- Institute of Industrial Science, University of Tokyo
- Title
- Global flow induction by helicity: A closure approach to inhomogeneous turbulence
- Abstract
-
With accompanied by large-scale inhomogeneous fields, such as rotation, velocity strain, magnetic field, density stratification, radiation, astrophysical turbulence is not homogeneous isotropic, but highly inhomogeneous and anisotropic. Also due to these fields, some symmetry in turbulence is often broken. These conditions of astrophysical turbulence suggest that, in treating astrophysical turbulence, we have to incorporate the following two features: (i) nonlinear interactions between large-scale inhomogeneities and small-scale turbulence; (ii) dynamic balance between transport enhancement and suppression. In this talk, after a brief introduction to turbulence, a few closure approaches to inhomogeneous turbulence are outlined. Special references are made to turbulence modeling based on a renormalized perturbation theory with multiple-scale analysis. Among several interesting applications in the astrophysical context, turbulent vortex dynamo – global flow generation and sustainment mechanism through turbulence – is discussed as an illustrative example. In non-mirrorsymmetric turbulence, turbulent kinetic helicity (velocity–vorticity correlation) as well as turbulent energy represents the statistical properties of turbulence. In such a system, an enhanced momentum transport due to eddy viscosity coupled with the mean velocity strain can be counterbalanced by the helicity effect coupled with the mean absolute vorticity. This helicity effect may induce a global vortical flow structure without resorting to any baroclinicity (obliqueness between the density and pressure gradients) effect. Validation of the theoretical predictions through direct numerical simulations (DNSs) is also presented.
References: [1] http://arxiv.org/abs/1511.08983
[2] ]http://www.tandfonline.com/doi/abs/10.1080/03091929.2012.754022 - Facilitator
- -Name: Seiji Zenitani
- Comment
- English
2月17日(水)
- 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
- 臨時
- 日時
- 2月17日（水） 16:30-17:30
- 場所
- 講義室
- 講演者
- Jack Lissauer
- 所属
- NASA Ames Research Center
- タイトル
- Kepler’s Multiple Planet Systems
- Abstract
-
More than one-third of the 4700 planet candidates found by NASA’s Kepler spacecraft are associated with target stars that have more than one planet candidate, and such “multis” account for the vast majority of candidates that have been verified as true planets.
The large number of multis tells us that flat multiplanet systems like our Solar System are common. Virtually all of the candidate planetary systems are stable, as tested by numerical integrations that assume a physically motivated mass-radius relationship.
Statistical studies performed on these candidate systems reveal a great deal about the architecture of planetary systems, including the typical spacing of orbits and flatness.The characteristics of some of the most interesting confirmed Kepler multi-planet systems will also be discussed.
- 連絡先
- -名前：田中 雅臣
2月19日(金)
- Campus
- Mitaka
- Seminar
- Solar and Space Plasma Seminar
- Regularly Scheduled/Sporadic
- Regular
- Date and time
- 19 February (Fri), 13:30-15:00
- Place
- Small Seminar Room, Subaru Bldg
- Speaker
- Yoshinori Suematsu
- Affiliation
- NAOJ
- Title
- Development of Field Integral Spectroscopy for Advanced Observations of the Sun
- Abstract
-
Integral field spectroscopy (IFS) is a two dimensional spectroscopy, providing spectra simultaneously for each spatial direction of an extended two-dimensional field. There are generally three techniques to realize IFS depending on image slicing devices such as a micro-lenslet array, an optical fiber bundle and a thin rectangular image slicer array.
In this talk, I will review the issues and status of developments of these three techniques by giving detailed examples: The microlenslet array IFS was realized and are currently running at DST, Hida Obs., the fiber bundle IFS is designed for DKIST and SOLAR-C/SUVIT, and the image slicer is designed and its prototype is being made for SOLAR-C/SUVIT.
From the view point of a high efficiency spectroscopy, a wide wavelength coverage and a precision spectro-polarimetry, the metal mirror image slicer seems to be the best option for future solar observations in space. - Facilitator
- -Name：Shin Toriumi
2月19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
- 2月19日（金） 16:00-17:00
- 場所
- 大セミナー室
- 講演者
- Cheoun, Myung-Ki
- 所属
- ソンシル大学
- タイトル
- Compact stars, Humanbeings and Accelerators
- Abstract
-
In this talk, I would like to present current situations regarding how to understand the compact stars, in particular, neutron stars, in the viewpoint of the nuclear physics. Since most features relevant to the neutron star are extremely exotic, we need a new paradigm beyond the conventional nuclear physics.
In cold neutron stars, we expect highly dense nuclear matter, hyperon contribution, quark matter, and their exotic phase transitions inside the star. But they are never realized on the earth, which needs new understandings in both theoretical and experimental nuclear physics. In this context, recent heavy ion collision (HIC) or relativistic HIC (RHIC) experiments including lattice QCD calculations could provide important data for the dense matter physics in the compact star.
On the other hand, proto-neutron stars also give us a new realm of the nuclear physics because the nuclear reaction in the nucleosynthesis for the elements includes many unstable nuclei, which imprint their existences in the element abundances, although they instantaneously disappeared because of their short life times. Recent rare (or radioactive) isotope (RI) accelerator experiment facilities are trying to reproduce such cosmological thermal RI nuclear reactions in the earth. Not only the isotope but also the neutrino scattering and reactions in the supernovae explosion now becomes one of important fields in the modern nuclear physics because the weak interaction plays real trigger roles in the stellar evolution. But the neutrino beam facility is still in progress.
Within this context, I would like to give brief reviews of present theoretical and experimental tries in the nuclear physics to investigate the compact star with other interesting physics relevant to the compact star, such as effects of strong magnetic field and modified general relativity on the neutrons star. - 連絡先
- -名前：久保 雅仁
以上