平成23 (2011) 年度談話会
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#contents
*第177回: 2011/05/19(木) 15:30-16:30 [#xc9df0c9]
田村 陽一 氏 (東京大学・天文学教育研究センター)
「ASTE搭載用超伝導転移端センサ型ボロメータカメラとALMA初...
"The new TES bolometer camera for ASTE and the ALMA earl...
東京大学天文センター・国立天文台・北海道大学は、チリ・...
ASTE望遠鏡への搭載を目的とした超伝導転移端センサ型ボロメ...
2009年より推進している。本カメラは本年7月にASTE望遠鏡に...
（将来的には450ミクロンも）における地上天文観測を開始す...
その観測対象は、遠方銀河・銀河団、ガンマ線バースト、マゼ...
多岐にわたる。本講演の前半では、ASTE観測所の現状、本サブ...
サイエンスケース、および進捗を紹介する。
本講演の後半では、いよいよ開始されるALMAの初期科学運用...
3月末に観測提案公募の情報が、のべ100ページに迫る複数の文...
この公募の独特な点は、世界各国の電波天文学者の注目の高さ...
観測提案者・提案内容に課せられた条件の多さにあると言える...
初期運用フェイズのALMAの性能・観測公募の内容を読み解きた...
*第178回: 2011/06/16(木) 15:30-16:30 [#ue1c7dc4]
Michael Richmond 氏 (Rochester Institute of Technology)
"Looking for eclipsing RR Lyr stars in the MACHO database"
The MACHO Project collected photometry of many RR Lyrae ...
We examined the lightcurves of 3256 stars identified as ...
subtracting an empirical model of the pulsation lightcur...
There are no systems which show the brief dips in light ...
We discuss the results for objects which show the larges...
most of which are probably due to aliases of the fundame...
(See http://arxiv.org/abs/1106.0697.)
*第179回: 2011/06/30(木) 15:30-16:30 [#lc2a0f8d]
田中 賢幸 氏 (東京大学・IPMU)
"A new method to identify AGNs and the nature of low-lum...
We develop a new method to identify AGNs using optical s...
The newly developed method is fairly sensitive to low-lu...
also it allows us to cleanly subtract emission line flux...
and extract pure AGN emission, which is crucial to chara...
We study the nature of the identified low-luminosity AGN...
accretion rates and host galaxy properties.
Our findings include
(1) AGNs reside in massive galaxies (>1010 M_sun),
(2) accretion rates increase with increasing host galaxy...
(3) black hole growth rates increase with increasing hos...
We discuss implications of these findings for the BH-gal...
*第180回: 2011/07/07(木) 15:30-16:30 [#s1b59e6d]
橋本 哲也 氏 (国立天文台)
"A hint of AGN feedback: Shock heating of ISM induced by...
We present J-band long-slit spectroscopic observation of
NGC 1068 classified as a Seyfert 2 galaxy. J-band observ...
with OAO/ISLE provide clear detection of spatially exten...
and [P II]1.188um lines. We found that [Fe II]1.257um/[P...
increases with distance from a central continuum peak. O...
ratios around the nucleus (continuum peak) are consisten...
value expected from photoionization models, while the ra...
3 arcsec - 4 arcsec (210-280 pc) east and west of the nu...
are slightly higher than this. In the off nucleus region...
we also found a possible association between [Fe II]1.25...
and the radio continuum. This suggests a mild contributi...
ionization induced by a radio jet outside nucleus while ...
the central energy source is dominant near the nucleus. ...
a hint to investigate the on going site where the AGN ac...
its energy to surrounding interstellar medium (ISM) thro...
induced by a jet. This kind of energy input into ISM may...
key to reveal a recently emerged serious problem that th...
predict too many massive galaxies due to long-duration s...
contrast to early-time quenching of star formation in ob...
and may be also closely correlated with the co-evolution...
hole and its host galaxy. We also present preliminary re...
field unit spectroscopy (NIFS+AO) of narrow line region ...
*第181回: 2011/07/21(木) 15:30-16:30 [#l527557e]
柏川 伸成 氏 (国立天文台)
「AKB48 vs. NMB48 vs. SKE48, そして LAE45vs.LAE54」
"Completing the Census of Lyα Emitters at the Reionizati...
We carried out extended spectroscopic confirmations of L...
in the Subaru Deep Field. Now, the total number of spect...
at z = 6.5 and 5.7, respectively, and at least 81% (70%)...
at z = 6.5 (5.7) have been spectroscopically identified ...
We made careful measurements of the Lyα luminosity, both...
to accurately determine the Lyα and rest-UV luminosity f...
The substantially improved evaluation of the Lyα LF at z...
from z = 5.7 at least at the bright end, and a possible ...
though small uncertainties remain. The rest-UV LFs at z ...
at least at the bright end, in clear contrast to the dif...
These results imply an increase in the neutral fraction ...
from z = 5.7 to 6.5. The rest-frame equivalent width (EW...
seems to be systematically smaller than z = 5.7, and it ...
The bright end of the rest-UV LF can be reproduced from ...
EW_0 -UV luminosity relation. Integrating this rest-UV L...
the contribution of LAEs to the photon budget required f...
suggests that the fractional contribution of LAEs to the...
significantly increases toward faint magnitudes. Low-lum...
the ionizing photon budget, though this inference depend...
faint-end slope of the Lyα LF.
*第182回: 2011/07/28(木) 15:30-16:30 [#yf71b505]
上塚 貴史 氏 (東大・天文センター)
"Mid-infrared spectral monitoring toward AGB stars - Pro...
Asymptotic giant branch (AGB) stars are the stars in the...
and intermediate-mass stars. They are known to show mass...
and the events play an important role for chemical evolu...
The stellar wind is thought to be driven by radiative pr...
After the grains are formed, they are accelerated by the...
and the gaseous material is accelerated by the gas-dust ...
This scenario has not been fully investigated by observa...
when, where and what kind of grains are formed around th...
and mid-infrared spectral monitoring is one of useful me...
As an example, I will present our monitoring observation...
which are Mira type variables in the Large Magellanic Cl...
Both objects showed time variation of silicate features....
mainly by the temperature variation caused by the lumino...
However, the strength and the shape of the feature aroun...
explained by this effect. This suggests possibility of t...
From this result, the monitoring observations are though...
In this talk, I will discuss about this result and the u...
*第183回: 2011/10/06(木) 15:30-16:30 [#pd8f2669]
眞山 聡 氏 (総研大)
「すばる+ALMA及びコンピュータシミュレーションで探る連星...
"Subaru + ALMA Observations and numerical simulations of...
Protoplanetary disks afford a key to an understanding of...
and other planetary systems. They are the ingredients o...
in early stellar evolution. If a forming star with a pr...
the disk may be seriously influenced. This effect shoul...
because most stars form as multiples. Studies of protop...
thus important to unravel the general process of star an...
From this point of view, we conducted Subaru direct obse...
in multiple systems. High angular resolution near-infra...
young binaries were obtained with the infrared camera Co...
with Adaptive Optics mounted on the 8.2m Subaru Telescop...
resolve complex circumstellar structures around binary s...
result as well as 2D and 3D numerical simulations which ...
Additionally, our observational future plans of multiple...
*第184回: 2011/10/13(木) 15:30-16:30 [#s7ff9232]
Gaston Folatelli 氏 (東京大学・IPMU)
"What spectra reveal of Type Ia Supernovae"
I will address the importance of Type Ia supernovae (SNe...
and also as distance indicators for cosmology. Based on ...
Project (CSP), I will describe how precision distances a...
of reddening. The role of optical spectroscopy in improv...
nature of these events will be addressed. In particular,...
material in a significant fraction of SNe Ia, and its im...
*第185回: 2011/10/17(月) 15:30-16:30 [#ae49ec35]
Wolfgang Gieren 氏 (Universidad de Concepcion)
"Improving the extragalactic distance scale with stellar...
I will review recent progress made in our project toward...
period-luminosity (PL) relation, both from observing Cep...
in optical and near-infrared bands, and by applying the ...
to Cepheids in the Milky Way and the Magellanic Clouds.
Evidence is presented that the K-band PL relation is uni...
of the calibrating or target Cepheid samples), and a bes...
which can be readily used to measure a precision distanc...
I will also review recent progress in using late-type ec...
for deriving distances of exquisite (3%) accuracy to the...
for the distance scale. I will further present our recen...
masses of two classical Cepheids in the LMC which settle...
and improve the physical knowledge of Cepheid stars as p...
Finally, I will highlight a new spectroscopic method to ...
to spiral galaxies from their blue supergiant population...
technique yields distance results in very good agreement...
Quantitative spectroscopy of blue supergiants is also an...
unbiased metallicity gradients in the disks of spiral ga...
which are an essential input for galaxy formation and ev...
*第186回: 2011/11/24(木) 15:30-16:30 [#sa8b9819]
高橋 英則 氏 (東京大学・天文センター)
「近赤外分光撮像観測によるWolf-Rayet星の探索」
"Search for Wolf-Rayet stars by NIR imaging spectroscopy"
Wolf-Rayet星は大質量星故のエネルギー放射や質量放出によっ...
さらに次世代の星形成などに大きな影響を与える。ところで、...
銀河系の化学進化から想定される数よりも少ない。その原因の...
形成される環境の観点から、その一生を星間物質に埋もれたま...
そこで、その素性及びどのような環境で誕生・進化するかを明...
このような埋もれたWR星を検出すべく、近赤外分光撮像による...
この手法として、WR星に特徴的な近赤外線（WC型：CIV輝線（2...
に最適化された狭帯域フィルターとKsバンドフィルターを用い...
処理することで、効率的且つ高い確度でWR星を検出することが...
減光が大きな銀河中心方向や系内大質量星形成領域、LMCなど...
これらの領域は、1) 星形成活動度が高い、2) 広い質量範囲の...
盛んな環境である、などの理由から、大質量星形成に限らず、...
興味深い領域である。講演では、この観測手法の詳細から現在...
*第187回: 2011/12/01(木) 15:30-16:30 [#w57a6ea8]
松永 典之 氏 (東京大学・天文センター・木曽観測所)
「セファイド変光星で探る銀河系中心領域の星形成史」
"Star formation history in the Galactic Nuclear Bulge re...
銀河系中心は、非常に多くの星・星間物質やブラックホール、...
興味深い領域である。銀河系中心から200pc程度の領域(Nuclea...
もつ大きな星団が見つかっており、今も星形成が起 こってい...
また、現在までの星形成が連続的であったことも 示唆されて...
その結論は光度関数と の比較によるもので、間接的・暫定的...
そこで、恒星進化理論から年齢の わかるセファイド変光星の...
IRSF望遠鏡およびSIRIUSカメラを用い て、2001年から2008年...
セファイド変光 星を3個発見することに成功した。それらの周...
約25Myr の年齢を持つことが分かる。今から25Myr前にNuclear...
示す初めての証拠である。一方、周期5-19日(30-70Myrの年齢...
見つからなかった。 このことは、数十MyrごとにNuclear Bulg...
示唆しており、銀河系中心領域での星間 物質の供給・消費な...
参考文献：Matsunaga et al. 2011, Nature 477, 188
The region within ~200 pc of the central black hole of o...
is an ideal place to study star formation activities in ...
with a wide range of ages are found in this region, but ...
Here we report the first discovery in the Nuclear Bulge ...
whose ages can be derived accurately from their periods....
periods near 20 days and an age of close to 25 Myr. In c...
Cepheids shows that the star formation rate was much low...
This indicates that star formation in the Nuclear Bulge ...
Such detailed star formation histories have never been o...
other galaxies. We discuss a correlation between the gas...
*第188回: 2011/12/08(木) 15:30-16:30 [#xb8c189f]
野田 博文 氏 (東京大学)
「X線観測で明らかにする AGN セントラルエンジンの新描像」
"Studying a new picture of AGN Central Engines with X-ra...
AGNのX線放射は、降着円盤や冷たい周辺物質による光子散乱散...
などの観点から、盛んに研究されてきた。しかしセイファート...
すなわち巨大ブラックホール近傍の高温コンプトンコロナその...
AGNを理解する上で、このセントラルエンジンの理解は、避け...
我々は、広帯域を誇る「すざく」衛星を用い、AGNのX線放射に...
軟X線超過の起源を見直すとともに、「すざく」によるブラッ...
その結果、これまで単一ゾーンで近似されて来たセイファート...
光学的厚みから成るマルチゾーン特性をもつという、新しい可...
本談話会では、この着想に至った我々の研究を紹介すると同時...
開発中の次期X線天文衛星ASTRO-Hを視野に入れた将来の研究に...
*第189回: 2011/12/15(木) 15:30-16:30 [#t5d95702]
松元 亮治 氏 (千葉大学)
「円盤ダイナモとブラックホール候補天体における状態遷移の...
"Magnetohydrodynamic Simulations of Disk Dynamos and Sta...
Three-dimensional magnetohydrodynamic(MHD) simulations r...
driven by the magneto-rotational instability and Parker ...
in galactic gas disks.
The quasi-periodic dynamo can be the origin of low-frequ...
(QPOs) observed in galactic black hole candidates.
By carrying out global three-dimensional MHD simulations...
that the transition luminosity from X-ray hard state to ...
magnetic flux in the accretion disk. We discuss how the ...
plane is determined in black hole accretion flows.
降着円盤や銀河ガス円盤などの差動回転円盤では磁気回転不安...
駆動される準周期的なダイナモが発生することが、３次元磁気...
このような準周期的ダイナモは銀河系内のブラックホール候補...
（Quasi-Periodic Oscillation：QPO）の起源になっている可...
輻射冷却を考慮した大局的な３次元磁気流体シミュレーション...
色－光度図上の進化経路、特に硬X線が強いハードステートか...
状態遷移光度は円盤内部の方位角方向の磁束量に依存すること...
降着率変動に伴う降着円盤の進化を、３次元磁気流体計算結果...
*第190回: 2012/01/26(木) 15:30-16:30 [#mac1b639]
Parthasarathy Mudumba (Indian Institute of Astrophysics,...
"Progenitors of Type Ia SNe : Binary stars with white dw...
Type Ia SNe are thought to come from carbon-oxygen white...
binary companions until they approach the Chandrasekhar ...
complete thermonuclear disruption. A survey of the obser...
white dwarfs is presented. All types of white dwarf + ma...
binaries, close-binary central stars of planetary nebul...
binaries, supersoft X-ray sources and V Sge type objects...
of promising single-degenetate systems and the dearth of...
it appears that single-degenerate binaries produce most ...
double-degenerate binaries produce some or perhaps none.
*第191回: 2012/02/02(木) 15:30-16:30 [#ee345cf9]
菅井 肇 (東京大学・IPMU)
"Two Instruments for Subaru Telescope"
すばる望遠鏡は、優れた結像性能と広い視野に大きな特徴を持...
京都三次元分光器第２号機の開発を行ってきた。とくに高空間...
若い活動銀河中心核からのアウトフローの研究や、重力レンズ...
行ってきた。さらなる発展として、すばる新補償光学システム...
４月に予定している。一方で、現在、広い視野を有効に活かす...
開発を進めている。２４００本のファイバを、３色腕を持つ４...
1.3度視野直径にある天体を同時に分光（0.38-1.3um）観測す...
宇宙論・銀河系形成・銀河進化などの分野に威力を発揮すると...
３月に行われる概念設計審査に向けて準備を進めている。
*第192回: 2012/03/08(木) 15:30-16:30 [#kd561c8e]
Kevin Bundy (University of Tokyo, IPMU)
"Building massive galaxies: Hierarchical assembly from p...
The physical processes that regulate the growth of massi...
Globally, it is expected that such galaxies assemble at ...
hierarchical models is largely untested because cosmic v...
current high-z surveys swamps any potential signal. Tha...
panoramic surveys will bring definitive answers. I will...
galaxy assembly with one such survey, the now 50% comple...
Survey (BOSS). Turning from surveys limited to only the...
I will then discuss new observational efforts in the com...
I will introduce a proposed extension of the SDSS called...
2D measures of kinematics, emission line diagnostics, an...
nearby galaxies. Surveys like MaNGA will test specific ...
and evolution revealed in wide-field redshift surveys.
*第193回: 2012/03/15(木) 15:30-16:30 [#m53c27cf]
資料: &ref(kcc_ps1_uni_tokyo.pptx,,pptx);, &ref(kcc_ps1_u...
Kenneth C. Chambers (Institute for Astronomy, University...
"Pan-STARRS1 - Status and Early Science"
Pan-STARRS1 began the PS1 Science Mission May 13, 2009.
Operations of the PS1 System include the Observatory, Te...
1.4 Gigapixel Camera, Image Processing Pipeline , PSPS r...
database and reduced science product software servers.
The PS1 Surveys include: (1) A 3pi Steradian Survey;
which current has obtained more than 30 epochs in 5 pass...
of the entire sky north of Dec = -30, or 30,000 square d...
with 0.26 arcsecond pixels, or nearly 2 Petabytes of ima...
(2) A Medium Deep survey of 10 PS1 footprints spaced aro...
the sky or a total of 70 square degrees; (3) A solar sys...
plane survey optimized for the discovery of Near Earth O...
Kuiper Belt Objects, (4) a Stellar Transit Survey of ~50...
the galactic buldge; and (5) a Deep Survey of M31 with s...
to a proper cadence for microlensing.
The performance of the PS1 system, sky coverage, cadence...
data quality of the images, the photometric calibration,...
precision will be presented. Early science ranging from...
brown dwarfs, galactic structure, supernovae, and galaxy...
presented. The completion of the PS1 Survey, the status...
plans for a PS1+PS2 Mission will be briefly addressed.
The PS1 Science Consortium consists of The Institute for...
at the University of Hawai'i in Manoa, the Max Planck In...
Heidelberg, the Max Planck Institute for Extraterrestria...
The Johns Hopkins University, the University of Durham, ...
Edinburgh, the Queen's University Belfast, the Harvard-S...
for Astrophysics, the Los Cumbres Observatory Global Tel...
Incorporated, the National Central University of Taiwan,...
the NEOO program.
終了行:
[[FrontPage]]
#contents
*第177回: 2011/05/19(木) 15:30-16:30 [#xc9df0c9]
田村 陽一 氏 (東京大学・天文学教育研究センター)
「ASTE搭載用超伝導転移端センサ型ボロメータカメラとALMA初...
"The new TES bolometer camera for ASTE and the ALMA earl...
東京大学天文センター・国立天文台・北海道大学は、チリ・...
ASTE望遠鏡への搭載を目的とした超伝導転移端センサ型ボロメ...
2009年より推進している。本カメラは本年7月にASTE望遠鏡に...
（将来的には450ミクロンも）における地上天文観測を開始す...
その観測対象は、遠方銀河・銀河団、ガンマ線バースト、マゼ...
多岐にわたる。本講演の前半では、ASTE観測所の現状、本サブ...
サイエンスケース、および進捗を紹介する。
本講演の後半では、いよいよ開始されるALMAの初期科学運用...
3月末に観測提案公募の情報が、のべ100ページに迫る複数の文...
この公募の独特な点は、世界各国の電波天文学者の注目の高さ...
観測提案者・提案内容に課せられた条件の多さにあると言える...
初期運用フェイズのALMAの性能・観測公募の内容を読み解きた...
*第178回: 2011/06/16(木) 15:30-16:30 [#ue1c7dc4]
Michael Richmond 氏 (Rochester Institute of Technology)
"Looking for eclipsing RR Lyr stars in the MACHO database"
The MACHO Project collected photometry of many RR Lyrae ...
We examined the lightcurves of 3256 stars identified as ...
subtracting an empirical model of the pulsation lightcur...
There are no systems which show the brief dips in light ...
We discuss the results for objects which show the larges...
most of which are probably due to aliases of the fundame...
(See http://arxiv.org/abs/1106.0697.)
*第179回: 2011/06/30(木) 15:30-16:30 [#lc2a0f8d]
田中 賢幸 氏 (東京大学・IPMU)
"A new method to identify AGNs and the nature of low-lum...
We develop a new method to identify AGNs using optical s...
The newly developed method is fairly sensitive to low-lu...
also it allows us to cleanly subtract emission line flux...
and extract pure AGN emission, which is crucial to chara...
We study the nature of the identified low-luminosity AGN...
accretion rates and host galaxy properties.
Our findings include
(1) AGNs reside in massive galaxies (>1010 M_sun),
(2) accretion rates increase with increasing host galaxy...
(3) black hole growth rates increase with increasing hos...
We discuss implications of these findings for the BH-gal...
*第180回: 2011/07/07(木) 15:30-16:30 [#s1b59e6d]
橋本 哲也 氏 (国立天文台)
"A hint of AGN feedback: Shock heating of ISM induced by...
We present J-band long-slit spectroscopic observation of
NGC 1068 classified as a Seyfert 2 galaxy. J-band observ...
with OAO/ISLE provide clear detection of spatially exten...
and [P II]1.188um lines. We found that [Fe II]1.257um/[P...
increases with distance from a central continuum peak. O...
ratios around the nucleus (continuum peak) are consisten...
value expected from photoionization models, while the ra...
3 arcsec - 4 arcsec (210-280 pc) east and west of the nu...
are slightly higher than this. In the off nucleus region...
we also found a possible association between [Fe II]1.25...
and the radio continuum. This suggests a mild contributi...
ionization induced by a radio jet outside nucleus while ...
the central energy source is dominant near the nucleus. ...
a hint to investigate the on going site where the AGN ac...
its energy to surrounding interstellar medium (ISM) thro...
induced by a jet. This kind of energy input into ISM may...
key to reveal a recently emerged serious problem that th...
predict too many massive galaxies due to long-duration s...
contrast to early-time quenching of star formation in ob...
and may be also closely correlated with the co-evolution...
hole and its host galaxy. We also present preliminary re...
field unit spectroscopy (NIFS+AO) of narrow line region ...
*第181回: 2011/07/21(木) 15:30-16:30 [#l527557e]
柏川 伸成 氏 (国立天文台)
「AKB48 vs. NMB48 vs. SKE48, そして LAE45vs.LAE54」
"Completing the Census of Lyα Emitters at the Reionizati...
We carried out extended spectroscopic confirmations of L...
in the Subaru Deep Field. Now, the total number of spect...
at z = 6.5 and 5.7, respectively, and at least 81% (70%)...
at z = 6.5 (5.7) have been spectroscopically identified ...
We made careful measurements of the Lyα luminosity, both...
to accurately determine the Lyα and rest-UV luminosity f...
The substantially improved evaluation of the Lyα LF at z...
from z = 5.7 at least at the bright end, and a possible ...
though small uncertainties remain. The rest-UV LFs at z ...
at least at the bright end, in clear contrast to the dif...
These results imply an increase in the neutral fraction ...
from z = 5.7 to 6.5. The rest-frame equivalent width (EW...
seems to be systematically smaller than z = 5.7, and it ...
The bright end of the rest-UV LF can be reproduced from ...
EW_0 -UV luminosity relation. Integrating this rest-UV L...
the contribution of LAEs to the photon budget required f...
suggests that the fractional contribution of LAEs to the...
significantly increases toward faint magnitudes. Low-lum...
the ionizing photon budget, though this inference depend...
faint-end slope of the Lyα LF.
*第182回: 2011/07/28(木) 15:30-16:30 [#yf71b505]
上塚 貴史 氏 (東大・天文センター)
"Mid-infrared spectral monitoring toward AGB stars - Pro...
Asymptotic giant branch (AGB) stars are the stars in the...
and intermediate-mass stars. They are known to show mass...
and the events play an important role for chemical evolu...
The stellar wind is thought to be driven by radiative pr...
After the grains are formed, they are accelerated by the...
and the gaseous material is accelerated by the gas-dust ...
This scenario has not been fully investigated by observa...
when, where and what kind of grains are formed around th...
and mid-infrared spectral monitoring is one of useful me...
As an example, I will present our monitoring observation...
which are Mira type variables in the Large Magellanic Cl...
Both objects showed time variation of silicate features....
mainly by the temperature variation caused by the lumino...
However, the strength and the shape of the feature aroun...
explained by this effect. This suggests possibility of t...
From this result, the monitoring observations are though...
In this talk, I will discuss about this result and the u...
*第183回: 2011/10/06(木) 15:30-16:30 [#pd8f2669]
眞山 聡 氏 (総研大)
「すばる+ALMA及びコンピュータシミュレーションで探る連星...
"Subaru + ALMA Observations and numerical simulations of...
Protoplanetary disks afford a key to an understanding of...
and other planetary systems. They are the ingredients o...
in early stellar evolution. If a forming star with a pr...
the disk may be seriously influenced. This effect shoul...
because most stars form as multiples. Studies of protop...
thus important to unravel the general process of star an...
From this point of view, we conducted Subaru direct obse...
in multiple systems. High angular resolution near-infra...
young binaries were obtained with the infrared camera Co...
with Adaptive Optics mounted on the 8.2m Subaru Telescop...
resolve complex circumstellar structures around binary s...
result as well as 2D and 3D numerical simulations which ...
Additionally, our observational future plans of multiple...
*第184回: 2011/10/13(木) 15:30-16:30 [#s7ff9232]
Gaston Folatelli 氏 (東京大学・IPMU)
"What spectra reveal of Type Ia Supernovae"
I will address the importance of Type Ia supernovae (SNe...
and also as distance indicators for cosmology. Based on ...
Project (CSP), I will describe how precision distances a...
of reddening. The role of optical spectroscopy in improv...
nature of these events will be addressed. In particular,...
material in a significant fraction of SNe Ia, and its im...
*第185回: 2011/10/17(月) 15:30-16:30 [#ae49ec35]
Wolfgang Gieren 氏 (Universidad de Concepcion)
"Improving the extragalactic distance scale with stellar...
I will review recent progress made in our project toward...
period-luminosity (PL) relation, both from observing Cep...
in optical and near-infrared bands, and by applying the ...
to Cepheids in the Milky Way and the Magellanic Clouds.
Evidence is presented that the K-band PL relation is uni...
of the calibrating or target Cepheid samples), and a bes...
which can be readily used to measure a precision distanc...
I will also review recent progress in using late-type ec...
for deriving distances of exquisite (3%) accuracy to the...
for the distance scale. I will further present our recen...
masses of two classical Cepheids in the LMC which settle...
and improve the physical knowledge of Cepheid stars as p...
Finally, I will highlight a new spectroscopic method to ...
to spiral galaxies from their blue supergiant population...
technique yields distance results in very good agreement...
Quantitative spectroscopy of blue supergiants is also an...
unbiased metallicity gradients in the disks of spiral ga...
which are an essential input for galaxy formation and ev...
*第186回: 2011/11/24(木) 15:30-16:30 [#sa8b9819]
高橋 英則 氏 (東京大学・天文センター)
「近赤外分光撮像観測によるWolf-Rayet星の探索」
"Search for Wolf-Rayet stars by NIR imaging spectroscopy"
Wolf-Rayet星は大質量星故のエネルギー放射や質量放出によっ...
さらに次世代の星形成などに大きな影響を与える。ところで、...
銀河系の化学進化から想定される数よりも少ない。その原因の...
形成される環境の観点から、その一生を星間物質に埋もれたま...
そこで、その素性及びどのような環境で誕生・進化するかを明...
このような埋もれたWR星を検出すべく、近赤外分光撮像による...
この手法として、WR星に特徴的な近赤外線（WC型：CIV輝線（2...
に最適化された狭帯域フィルターとKsバンドフィルターを用い...
処理することで、効率的且つ高い確度でWR星を検出することが...
減光が大きな銀河中心方向や系内大質量星形成領域、LMCなど...
これらの領域は、1) 星形成活動度が高い、2) 広い質量範囲の...
盛んな環境である、などの理由から、大質量星形成に限らず、...
興味深い領域である。講演では、この観測手法の詳細から現在...
*第187回: 2011/12/01(木) 15:30-16:30 [#w57a6ea8]
松永 典之 氏 (東京大学・天文センター・木曽観測所)
「セファイド変光星で探る銀河系中心領域の星形成史」
"Star formation history in the Galactic Nuclear Bulge re...
銀河系中心は、非常に多くの星・星間物質やブラックホール、...
興味深い領域である。銀河系中心から200pc程度の領域(Nuclea...
もつ大きな星団が見つかっており、今も星形成が起 こってい...
また、現在までの星形成が連続的であったことも 示唆されて...
その結論は光度関数と の比較によるもので、間接的・暫定的...
そこで、恒星進化理論から年齢の わかるセファイド変光星の...
IRSF望遠鏡およびSIRIUSカメラを用い て、2001年から2008年...
セファイド変光 星を3個発見することに成功した。それらの周...
約25Myr の年齢を持つことが分かる。今から25Myr前にNuclear...
示す初めての証拠である。一方、周期5-19日(30-70Myrの年齢...
見つからなかった。 このことは、数十MyrごとにNuclear Bulg...
示唆しており、銀河系中心領域での星間 物質の供給・消費な...
参考文献：Matsunaga et al. 2011, Nature 477, 188
The region within ~200 pc of the central black hole of o...
is an ideal place to study star formation activities in ...
with a wide range of ages are found in this region, but ...
Here we report the first discovery in the Nuclear Bulge ...
whose ages can be derived accurately from their periods....
periods near 20 days and an age of close to 25 Myr. In c...
Cepheids shows that the star formation rate was much low...
This indicates that star formation in the Nuclear Bulge ...
Such detailed star formation histories have never been o...
other galaxies. We discuss a correlation between the gas...
*第188回: 2011/12/08(木) 15:30-16:30 [#xb8c189f]
野田 博文 氏 (東京大学)
「X線観測で明らかにする AGN セントラルエンジンの新描像」
"Studying a new picture of AGN Central Engines with X-ra...
AGNのX線放射は、降着円盤や冷たい周辺物質による光子散乱散...
などの観点から、盛んに研究されてきた。しかしセイファート...
すなわち巨大ブラックホール近傍の高温コンプトンコロナその...
AGNを理解する上で、このセントラルエンジンの理解は、避け...
我々は、広帯域を誇る「すざく」衛星を用い、AGNのX線放射に...
軟X線超過の起源を見直すとともに、「すざく」によるブラッ...
その結果、これまで単一ゾーンで近似されて来たセイファート...
光学的厚みから成るマルチゾーン特性をもつという、新しい可...
本談話会では、この着想に至った我々の研究を紹介すると同時...
開発中の次期X線天文衛星ASTRO-Hを視野に入れた将来の研究に...
*第189回: 2011/12/15(木) 15:30-16:30 [#t5d95702]
松元 亮治 氏 (千葉大学)
「円盤ダイナモとブラックホール候補天体における状態遷移の...
"Magnetohydrodynamic Simulations of Disk Dynamos and Sta...
Three-dimensional magnetohydrodynamic(MHD) simulations r...
driven by the magneto-rotational instability and Parker ...
in galactic gas disks.
The quasi-periodic dynamo can be the origin of low-frequ...
(QPOs) observed in galactic black hole candidates.
By carrying out global three-dimensional MHD simulations...
that the transition luminosity from X-ray hard state to ...
magnetic flux in the accretion disk. We discuss how the ...
plane is determined in black hole accretion flows.
降着円盤や銀河ガス円盤などの差動回転円盤では磁気回転不安...
駆動される準周期的なダイナモが発生することが、３次元磁気...
このような準周期的ダイナモは銀河系内のブラックホール候補...
（Quasi-Periodic Oscillation：QPO）の起源になっている可...
輻射冷却を考慮した大局的な３次元磁気流体シミュレーション...
色－光度図上の進化経路、特に硬X線が強いハードステートか...
状態遷移光度は円盤内部の方位角方向の磁束量に依存すること...
降着率変動に伴う降着円盤の進化を、３次元磁気流体計算結果...
*第190回: 2012/01/26(木) 15:30-16:30 [#mac1b639]
Parthasarathy Mudumba (Indian Institute of Astrophysics,...
"Progenitors of Type Ia SNe : Binary stars with white dw...
Type Ia SNe are thought to come from carbon-oxygen white...
binary companions until they approach the Chandrasekhar ...
complete thermonuclear disruption. A survey of the obser...
white dwarfs is presented. All types of white dwarf + ma...
binaries, close-binary central stars of planetary nebul...
binaries, supersoft X-ray sources and V Sge type objects...
of promising single-degenetate systems and the dearth of...
it appears that single-degenerate binaries produce most ...
double-degenerate binaries produce some or perhaps none.
*第191回: 2012/02/02(木) 15:30-16:30 [#ee345cf9]
菅井 肇 (東京大学・IPMU)
"Two Instruments for Subaru Telescope"
すばる望遠鏡は、優れた結像性能と広い視野に大きな特徴を持...
京都三次元分光器第２号機の開発を行ってきた。とくに高空間...
若い活動銀河中心核からのアウトフローの研究や、重力レンズ...
行ってきた。さらなる発展として、すばる新補償光学システム...
４月に予定している。一方で、現在、広い視野を有効に活かす...
開発を進めている。２４００本のファイバを、３色腕を持つ４...
1.3度視野直径にある天体を同時に分光（0.38-1.3um）観測す...
宇宙論・銀河系形成・銀河進化などの分野に威力を発揮すると...
３月に行われる概念設計審査に向けて準備を進めている。
*第192回: 2012/03/08(木) 15:30-16:30 [#kd561c8e]
Kevin Bundy (University of Tokyo, IPMU)
"Building massive galaxies: Hierarchical assembly from p...
The physical processes that regulate the growth of massi...
Globally, it is expected that such galaxies assemble at ...
hierarchical models is largely untested because cosmic v...
current high-z surveys swamps any potential signal. Tha...
panoramic surveys will bring definitive answers. I will...
galaxy assembly with one such survey, the now 50% comple...
Survey (BOSS). Turning from surveys limited to only the...
I will then discuss new observational efforts in the com...
I will introduce a proposed extension of the SDSS called...
2D measures of kinematics, emission line diagnostics, an...
nearby galaxies. Surveys like MaNGA will test specific ...
and evolution revealed in wide-field redshift surveys.
*第193回: 2012/03/15(木) 15:30-16:30 [#m53c27cf]
資料: &ref(kcc_ps1_uni_tokyo.pptx,,pptx);, &ref(kcc_ps1_u...
Kenneth C. Chambers (Institute for Astronomy, University...
"Pan-STARRS1 - Status and Early Science"
Pan-STARRS1 began the PS1 Science Mission May 13, 2009.
Operations of the PS1 System include the Observatory, Te...
1.4 Gigapixel Camera, Image Processing Pipeline , PSPS r...
database and reduced science product software servers.
The PS1 Surveys include: (1) A 3pi Steradian Survey;
which current has obtained more than 30 epochs in 5 pass...
of the entire sky north of Dec = -30, or 30,000 square d...
with 0.26 arcsecond pixels, or nearly 2 Petabytes of ima...
(2) A Medium Deep survey of 10 PS1 footprints spaced aro...
the sky or a total of 70 square degrees; (3) A solar sys...
plane survey optimized for the discovery of Near Earth O...
Kuiper Belt Objects, (4) a Stellar Transit Survey of ~50...
the galactic buldge; and (5) a Deep Survey of M31 with s...
to a proper cadence for microlensing.
The performance of the PS1 system, sky coverage, cadence...
data quality of the images, the photometric calibration,...
precision will be presented. Early science ranging from...
brown dwarfs, galactic structure, supernovae, and galaxy...
presented. The completion of the PS1 Survey, the status...
plans for a PS1+PS2 Mission will be briefly addressed.
The PS1 Science Consortium consists of The Institute for...
at the University of Hawai'i in Manoa, the Max Planck In...
Heidelberg, the Max Planck Institute for Extraterrestria...
The Johns Hopkins University, the University of Durham, ...
Edinburgh, the Queen's University Belfast, the Harvard-S...
for Astrophysics, the Los Cumbres Observatory Global Tel...
Incorporated, the National Central University of Taiwan,...
the NEOO program.
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