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*IoA Seminar 2013 / 2013年度・東京大学・天文学教育研究センター・談話会 [#va355cb1]
#contents
**次回以降の談話会 [#sd931ce8]
*** 第224回: 2013/5/30(木) 15:30-16:30 [#z4371eea]
*** 第225回: 2013/6/6(木) 15:30-16:30 [#z4371eea]
*** Speaker: 田中賢幸 (国立天文台) [#dbea6dd4]
*** Speaker: 高橋智子 (国立天文台) [#dbea6dd4]
*** Title: On the formation time scale of massive cluster ellipticals based on deep near-IR spectroscopy at z~2 [#i140d085]
*** Title: Millimeter and Submillimeter studies of the Orion Molecular Filaments. [#o0f3f001]
Abstract: We present improved constraints on the formation time scale of massive
cluster galaxies based on rest-frame optical spectra of galaxies in a
forming cluster located at z=2.16. The spectra are obtained with MOIRCS
with an integration time of ~7 hours. We achieve accurate redshift
measurements by fitting SEDs using the spectra and broad-band photometry
simultaneously, and that allows us to identify probable cluster members.
We find that quiescent member galaxies form a weak red sequence in
the process of forming. The stacked spectrum of these quiescent
galaxies reveals a clear 4000A break with a possible CaII H+K absorption
feature. We then perform detailed spectral analyses of the stacked
spectrum and suggest that these massive quiescent galaxies form at
redshifts between 3 and 4 on time scales of <~0.5 Gyr. We discuss
possible mechanisms for how these galaxies form 10^11 Msun stellar
mass on a short time scale and become red and quiescent by z=2.
Abstract: I will present high angular resolution and wide-field interferometric
continuum observations of the Orion Molecular Cloud (OMC) utilizing the Submilllimeter Array (SMA)
and Jansky Very Large Array (JVLA), covering 25'/3.1 pc length of the the northern part of
the OMC filaments. We detect at least 69 spatially resolved continuum sources associated
with OMC filamentary structures through thermal dust emission. Their estimated masses
and a projected source sizes range from 0.09 to 5.8 solar masses and 1010 to 19000 AU,
respectively. An analysis based on the Jeans theorem suggests that these sources are most
likely gravitationally unstable. Comparison of multi-wavelength datasets indicates that
approximately half of the detected continuum sources are associated with outflows,
infrared sources, and ionized jets. These sources show the evolutionary stage from prestellar core
to Class 0/ I phases. We found the source separation within the OMC filaments peaked
at 0.02 pc and 0.05 pc. This spatial distribution is part of a larger hierarchical structure,
that also includes fragmentation scales of GMCs ( 5 degree/ 37 pc), large-scale clumps (1.3 pc),
small-scale clumps (0.3 pc). This suggests that hierarchical fragmentation operates
within the Orion A molecular cloud. Fragmentation spacings are roughly consistent
with the local thermal fragmentation length in large-scale clumps ( 0.3 pc),
while fragmentation spacings in dense cores measured from the SMA observations is
smaller than the local fragmentation length. These smaller observed spacings can be
explained by either that helical magnetic field or global filament collapse.
** 趣旨 [#x55b0022]
東京大学・天文学教育研究センターでは2003年4月から, [[院生コロキウム:http://www.ioa.s.u-tokyo.ac.jp/colloquium/wiki/]]に引き続き, 談話会を開いています. ~
第一線で活躍されている研究者の方々を講師にお招きし, 最先端の研究成果をお話しいただきます. ~
講師の方には, 大学院生の参加者のことも考慮し, レビュー的な側面も含めた上で, ご自身の研究紹介をお願いしています.
**日時 [#j8e80aac]
-木曜日
-15:30-16:30
**場所 [#z7595414]
-天文センター講義室
**標準タイムテーブル [#l6b1491e]
|13:30-14:30|[[院生コロキウム:http://www.ioa.s.u-tokyo.ac.jp/colloquium/wiki/]]|講義室|
|15:30-16:30|談話会|講義室|
|16:30-|お茶の時間|講義室横のお茶部屋~講師の方を交えて~|
**世話人 [#a28e7dd8]
-河野 孝太郎: kkohno_at_ioa.s.u-tokyo.ac.jp (_at_を@に置き換えてください)
-田辺 俊彦: ttanabe_at_ioa.s.u-tokyo.ac.jp (_at_を@に置き換えてください)
-小西 真広: konishi_at_ioa.s.u-tokyo.ac.jp (_at_を@に置き換えてください)
**予定 [#ke98b8d9]
|BGCOLOR(cyan):#|BGCOLOR(cyan):日付|BGCOLOR(cyan):講演者 (所属)|BGCOLOR(cyan):タイトル|
|224|2013/05/30(Thu)|田中賢幸(国立天文台)|On the formation time scale of massive cluster ellipticals based on deep near-IR spectroscopy at z~2|
|225|2013/06/06(Thu)|高橋智子(国立天文台/チリ観測所)|Millimeter and Sbumillimeter studies of the Orion Molecular Filaments|
|226|2013/06/13(Thu)|新永浩子(国立天文台/チリ観測所)|Submillimeter Astronomy at Mauna Kea|
|227|2013/06/27(Thu)|戸谷友則(東大)||
|228|2013/06/28(Fri) 13:30-14:30|井上開輝(近畿大)||
**終了した談話会(今年度) [#v67584ff]
詳細はこちら: [[平成25 (2013) 年度談話会]]
|BGCOLOR(cyan):#|BGCOLOR(cyan):日付|BGCOLOR(cyan):講演者 (所属)|BGCOLOR(cyan):タイトル|
|224|2013/05/30(Thu)|田中賢幸(国立天文台)|On the formation time scale of massive cluster ellipticals based on deep near-IR spectroscopy at z~2|
|223|2013/05/23(Thu)|南谷哲宏(東大/IoA)|Physical Properties of Dense Molecular Clumps in the Small Magellanic Cloud|
|222|2013/05/16(Thu)|Gu Liyi(Univ. Tokyo/RESCEU)|Multi-wavelength Probe of Galaxy-Hot Plasma Interaction in Rich Clusters of Galaxies|
|221|2013/05/09(Thu)|遠藤 光(Delft University of Technology)|アストロフォトニクス：オンチップ超伝導分光計DESHIMAの研究開発|
|220|2013/04/26(Fri) 13:30-14:30|Malte Schramm(IPMU)|The co-evolution between black hole and galaxy over the past 12 billion years.|
|219|2013/04/18(Thu)|真喜屋 龍(東大/IoA)|宇宙論的銀河形成モデルへの新たなフィードバック機構の導入|
|218|2013/04/11(Thu)|小麦真也(国立天文台ALMA東アジアセンター)|星形成則の多変数化：星間物質の基本平面の発見|
**昨年度までの談話会 [#j1a9cca1]
-[[平成25 (2013) 年度談話会]]
-[[平成24 (2012) 年度談話会]]
-[[平成23 (2011) 年度談話会]]
-[[平成22 (2010) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H22.html]]
-[[平成21 (2009) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H21.html]]
-[[平成20 (2008) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H10.html]]
-[[平成19 (2007) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H19.html]]
-[[平成18 (2006) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H18.html]]
-[[平成17 (2005) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H17.html]]
-[[平成16 (2004) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H16.html]]
-[[平成15 (2003) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H15.html]]
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