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第1396回 天文学教室談話会

日時

2014年11月7日(金) 16:30

場所

大輪講室

講演者

Denis Burgarella (Laboratoire d'Astrophysique de Marseille)

題目

Studying the cosmic star formation history at z ~ 3-4 and beyond

要旨


With Herschel, we have been able to follow the evolution of the cosmic star formation history to z ~ 4. We will present the main results from this work. However, this is not the end of the story and we would like to better understand what happens at z ~ 3-4 and extends this to higher redshifts. The main population of high redshift objects are Lyman break galaxies (LBGs). So, the first step is to really understand what are the characteristics of LBGs at z ~ 3-4. We present the results of a study of the far-infrared (rest-frame) properties of z ~ 3 LBGs, based on Herschel (PACS and SPIRE) and AzTEC observations in COSMOS. We have used a stacking analysis to characterize the properties of LBGs, because (statistically) they cannot be detected individually. We have selected 15.600 LBGs. This is the largest sample used to do this kind of work up to now and we have determined the properties of our sample as a function of the FUV luminosity, the stellar mass and the UV slope. Finally, to extend the study to even higher redshifts, we propose a spectroscopic instrument named WISH-Spec for the WISH project. We will present WISH-Spec.

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【The Colloquium Committee in 2014】
Shijun Yoshida (yoshida<at>astr.tohoku.ac.jp)
Kimihiro Yamazaki (k.yamazaki<at>astr.tohoku.ac.jp)
Yusuke Okayasu (y.okayasu<at>astr.tohoku.ac.jp)
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