現在の位置 : TOPページ談話会案内2015年度 > 第1424回 天文学教室談話会

第1424回 天文学教室談話会

日時

2015年9月29日(火) 15:30

場所

合同C棟N507 天文専攻大輪講室

講演者

竹内 努(名古屋大学)

題目

Formation, Evolution, and Revolution of Galaxies by SKA

要旨


Formation and evolution of galaxies have been a central driving force in the studies of galaxies and cosmology. Recent studies provided a global picture of cosmic star formation history. However, what drives the evolution of star formation activities in galaxies has long been a matter of debate. The key factor of the star formation is the transition of hydrogen from atomic to molecular state, since the star formation is associated with the molecular phase. This transition is also strongly coupled with chemical evolution, because dust grains, i.e., tiny solid particles of heavy elements, play a critical role in molecular formation. Therefore, a comprehensive understanding of neutral? molecular gas transition, star formation and chemical enrichment is necessary to clarify the galaxy formation and evolution. Here we present the activity of SKA-JP galaxy evolution subWG. Our activity is focused on three epochs: z ~ 0, 1, and z > 3. At z ~ 0, we try to construct a unified picture of atomic and molecular hydrogen through nearby galaxies in terms of metallicity and other various ISM properties. Up to intermediate redshifts z ~ 1, we explore scaling relations including gas and star formation properties, like the main sequence and the Kennicutt?Schmidt law of star forming galaxies. To connect the global studies with spatially-resolved investigations, such relations will be plausibly a viable way. For high redshift objects, the absorption lines of Hi 21-cm line will be a very promising observable to explore the properties of gas in galaxies. By these studies, we will surely witness a real revolution in the studies of galaxies by SKA.

ご注意

  • 今後の予定は、都合により、やむを得ず変更される場合がございます。その場合には、このページおよび掲示にておしらせいたしますが、変更の反映まで時間がかかる場合がございます。ご了承ください。
  • 談話会についてのご相談、またはこのPageに関するご意見・ご質問等は下記連絡先までお願いします。
  • 当談話会ではいつでも講演者を募集しております。その際には発表タイトル、連絡先を、二週間前までにお送りくださいますようお願いいたします。

【The Colloquium Committee in 2015】
Kenji Toma (toma<at>astr.tohoku.ac.jp)
Yurina Mizuno
Kohei Miyazawa
   <at>-->@

All Rights Reserved. Copyright (c) 2011 Tohoku University Astronomical Institute .