2020.07.06-2020.07.12

7月7日(火)13:30~15:00  太陽系小天体セミナー               zoom
Jul 7 Tue         Solar System Minor Body Seminar       

7月8日(水)13:30~15:00 NAOJ Science Colloquium              zoom
Jul 8 Wed 

7月10日(金)13:30~15:00  太陽天体プラズマセミナー  zoom
Jul 10 Fri    Solar and Space Plasma Seminar       

7月10日(金)16:00~17:00   談話会                zoom
Jul 10 Fri         NAOJ Seminar  

詳細は以下をご覧下さい。

7月7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
7月7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

7月8日(水)

Campus
Mitaka
Seminar
NAOJ Science Colloquium
Regularly Scheduled/Sporadic
Every Wednesday
Date & Time: 2020 July 8, 13:30-15:00
Place
zoom
Title
Tracing galaxy evolution with deep spectroscopic survey
Speaker
Po-Feng Wu
Affiliation
EACOA fellow, Division of Optical/Infrared Astronomy
Abstract
The stars in galaxies hold the fossil record of galaxy formation and evolution. Stars of different ages leave various imprints on galaxy spectra, from which we can reconstruct the formation histories of individual galaxies. I will introduce the LEGA-C survey, an ESO large program using 100 nights on the VLT 8m to obtain thousands of ultra-deep galaxy spectra at z~1, the mid-point in the cosmic history, where the cosmic star-formation rate density starts to decline rapidly. I will present my effort on using the stellar ages and formation histories to reveal both the regularity and diversity of galaxy evolution at and from 7 billion years ago. This extra-galactic archaeology method will open new windows for galaxy evolution in the era of the Prime Focus Spectrograph on the Subaru telescope.

Facilitator
-Name:Akimasa Kataoka

7月10日(金)

Campus
Mitaka
Seminar
Solar and Space Plasma Seminar
Regularly Scheduled/Sporadic
Regular
Date and time
10 July (Fri), 13:30-15:00
Place
zoom
Speaker
Yusuke Kawabata
Affiliation
SSO/NAOJ
Title
Spectropolarimetric observations in the solar photosphere and chromosphere
Abstract
Magnetic field plays an important role in many phenomena in the Sun, such as flares, coronal mass ejections, atmospheric heating, solar winds, and solar cycle. To understand the fascinating phenomena, solar physicists have been inferring magnetic field through spectropolarimetric observations. The magnetic field measurements have been mainly performed with the photospheric lines. Recently, the chromospheric magnetic field started and planned to be measured with the large aperture ground-based telescope (SST, Gregor, DKIST), rocket experiments (CLASP, CLASP2), and balloon-borne observatory (Sunrise). I will review the results of the previous studies and present the latest findings based on the up-to-date spectropolarimetric observations. The future prospects with new telescopes will also be presented.
Facilitator
-Name:Munehito Shoda

7月10日(金)

Seminar
NAOJ Seminar (国立天文台談話会)
Regularly Scheduled/Sporadic
Regular
Date and time
7/10 (Fri) 16:00-17:00
Place
Zoom
Speaker
大内 正己 (国立天文台 教授) Masami Ouchi (Professor, NAOJ)
Affiliation
Division of Science, NAOJ
Title
Co-evolution of Galaxies and the Inter-Galactic Medium over z~0-10 Uncovered with Large Telescopes Including Subaru, ALMA, and the Next Generation 21cm Telescope
Abstract
In a widely accepted physical picture of galaxy formation, galaxies grow by inflow of the inter-galactic medium (IGM) via filaments of the large-scale structures. The process of inflow triggers star formation creating metal-rich gas in the inter-stellar medium (ISM), and the thermal and kinetic energy of massive stars and supernovae produce gas outflow and UV radiation via the circum-galactic medium (CGM), which proceed the IGM metal enrichment and cosmic reionization, respectively. To understand the process of galaxy formation over the ISM+CGM (galaxy) to the IGM (cosmological) scales by observations, one needs to investigate the combination of gas distribution, metal abundance, dynamics/ionization states, in contrast with many of previous observational studies that focus only on galaxies. This talk reviews our recent results of galaxies, CGM, and IGM at z~0-10 observed with various large telescopes including Subaru and ALMA, and discuss the interplay of matter/radiation exchanges between galaxies and the IGM over the cosmic history. I touch future prospects, introducing the next generation studies of the galaxy-IGM interplay at the epoch of reionization by the combination of the forthcoming optical/near-infrared and 21cm radio observations.
Facilitator
-Name:Akimasa Kataoka

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