1月20日（月）13：30～15：00 太陽系小天体セミナー 南棟2階会議室
Jan 20 Mon Solar System Minor Body Seminar Conference Room, South Bldg. 2F
1月22日（水）10：30～12：00 総研大コロキウム 中央棟（北）1F講義室
Jan 22 Wed SOKENDAI colloquium Lecture Room
1月23日（木）14：00～15：30 理論コロキウム 中央棟（東）輪講室
Jan 23 Thu DTA Colloquium Rinko-shitsu,Main Bldg.(East)
1月24日（金）16：00～17：00 国立天文台談話会 大セミナー室
Jan 24 Fri NAOJ Seminar Large Seminar Room
詳細は以下をご覧下さい。
1月20日(月)
- キャンパス
- 三鷹
- セミナー名
- 太陽系小天体セミナー
- 臨時・定例の別
- 定例
- 日時
- 1月20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
- 所属
- かわさき宙と緑の科学館
- タイトル
- 分野レビュー(流星)
- 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
1月22日(水)
- Campus
- Mitaka
- Seminar Name
- SOKENDAI colloquium
- Regular/Irregular
- Regular
- Date
- 10:30-12:00, Jan 22, 2014
- Place
- Lecture Room
- Speaker 1
- Anjali John K
- Affiliation
- D3, SOKENDAI, Mitaka（supervisor : Suematsu Yoshinori）
- Title
- Temporal evolution of the Sun’s Polar Magnetic Patches as observed with Hinode
- Abstract
- The Sun’s polar region is covered by countless discrete flux elements called as magnetic patches. The magnetic patches are believed to be formed from the remnant magnetic flux from the active latitudes which is transported to the polar region through diffusion and meridional circulation. It is likely that large unipolar patches with magnetic flux >10^18 Mx determine the magnetic polarity of each poles and their total flux is modulated by the solar cycle. It is important to understand the temporal evolution of these large patches to derive information of magnetic activities in the polar region, especially, the mechanism of magnetic polarity reversal. We also like to investigate the interaction between magnetic patches and the polar faculae whose occurrence tends to be associated with the large magnetic patches, according to our previous study. We obtained Hinode/SP and FG data for six hours of the south polar region in March 2013. We will show results obtained from this analysis.
- Speaker 2
- Ayumu Matsuzawa
- Affiliation
- D1, SOKENDAI, Mitaka（supervisor : Satoru Iguchi）
- Title
- Absorbing spectrum in galactic nucleus of M87 from VLBA archive data
- Abstract
- Super Massive Black Hole (SMBH) in Active Galactic Nuclei (AGN) attracts matters to form an accretion disk by its strong gravity. AGN is very bright than normal galaxy due to huge luminosity of accretion disk. In order to emit the huge luminosity, that requires a lot of accretion matter accreting to SMBH. The absorption was seen in spectrum of VLBI observation near SMBH. There are the two possibilities that absorption as synchrotron-self-absorption (SSA) from optically thin region of AGN jet or free-free-absorption (FFA) from cold dense plasma around SMBH. This cold dense plasma (we called FFA plasma) was considered as accreting matter to SMBH. The analysis of FFA around SMBH has been used to investigate this kind of accretion process at very vicinity (~pc-scale) of the BH. The purpose of my research is probing the FFA plasma around SMBH of M87. M87 is one of very important object, because M87 has the second-largest apparent Schwarzschild radius next to SrgA*.In order to probe the FFA plasma around SMBH of M87, we required the absorption spectrum of VLBI observation near SMBH of M87.We make the SED with seven frequencies (0.324, 1.6, 2.2, 4.9, 8.4, 15, 22GHz) on SMBH of M87 from VLBA archive data to confirm the absorption spectrum and the SED shown absorption spectrum.
- Organizer
- Name : Ayumu Matsuzawa
- Comment
- TV conference system is available connecting from Nobeyama, Hawaii,Mizusawa, and Okayama
1月23日(木)
- キャンパス
- 三鷹
- セミナー名
- 理論コロキウム
- 臨時・定例の別
- 臨時
- 日時
- 1月23日（木曜日）14時00分～15時30分
- 場所
- 輪講室
- 講演者
- Hsi-An Pan 氏
- 所属
- 総合研究大学院大学
- タイトル
- Environmental Dependence of Star Formation in Nearby Barred Spiral Galaxies
- Abstract
-
We study environmental dependence of the physical properties of GMCs and their ability of star formation in nearby galaxies. In the first place, the relation of molecular gas and stars are studied in large scale (few hundred pc) in terms of the Kennicutt-Schmidt (K-S) law in IC 342. We found that there is no universal K-S law in this galaxy.
The results of K-S law can be explained by the different star formation mechanisms in different regions of a galaxy. The results of IC 342 is reproduced by the similar analysis in other fifteen galaxies, suggesting that the non-universal star formation law is common in nearby galaxies. The non-universal K-S law can be explained with the variation of dense gas fraction as well. We further study this topic in the bar region of galaxy NGC 6946 by the observations with a fine resolution (100 pc). Star formation efficiency is enhanced in the northern bar of this galaxy in terms of its azimuthal K-S law.
Indeed, the resolved GMC properties suggest that the GMCs in the northern bar is denser than that in the southern bar and other area.
The denser GMCs may be a result of higher pressure of ambient ISM exerted on the GMCs. To confirm the result of NGC 6946, we enlarge the galactic environment by comparing the GMCs in NGC 6946 and those in starburst, normal disk, and dwarf galaxies. The results suggest again that galactic environments are regulating GMCs properties and their star forming activity. - 連絡先
- 名前：山崎 大
- 備考
- http://th.nao.ac.jp/seminar/colloquium/
1月24日(金)
- キャンパス
- 三鷹
- セミナー名
- 国立天文台談話会
- 臨時・定例の別
- 定例
- 日時
- 1月24日(金) 16:00-17:00
- 場所
- 大セミナー室
- 講演者
- Richard Ellis
- 所属
- California Institute of Technology
- タイトル
- “Observations of Star Forming Galaxies in the Heart of the Reionization Era”
- Abstract
- Deep exposures with the Hubble Space Telescope (HST) have provided the primary evidence that star-forming galaxies were present in the first billion years of cosmic history. Sometime during this early period the intergalactic medium transitioned from a neutral gas to one that is fully ionized. How did this `cosmic reionization’ occur and were star-forming galaxies responsible? The electron scattering optical depth inferred from cosmic microwave background observations suggests that reionization occurred sometime in the redshift interval z=20 to z=6 so probing the abundance, luminosity distribution and spectral properties of galaxies during this uncharted period holds the key to addressing these fundamental questions. Recent imaging with HST’s Wide Field Camera 3 in conjunction with Spitzer photometry and Keck spectroscopy has provided important new insight into understanding when reionization occurred and the role of early galaxies in the process. I will review this progress and discuss the remaining challenges ahead of future facilities such as TMT and JWST.
- 連絡先
- 名前：田中雅臣
以上