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每周学术报告
周五下午
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2008年 最新学术报告
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Journal Club
Galaxy Cosmology
AGN
VLBI Astrophysics
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时间：9月19日 星期二 下午2：00
报告人：Professor Gianfranco
Bertone (IAP, France)
报告题目：Particle dark matter:
what comes next
地点：三楼中会议室
Dark matter may not be completely dark. They may annihilate and decay into
visible sectors (gamma ray photons, positrons, cosmic ray protons, etc) and
may also collide with nucleons. For these reasons, dark matter particles
could leave distinguishable signatures in underground detectors, the Sun and
planets, galactic center, drawf
galaxies, the cosmic backgrounds, the reionization epoch or the
middle of nowhere. This provides us hope to see the otherwise "dark"
matter and the underlying fundamental physics. Dark matter detection
(indirect detection through astrophysical observations and direct
detection through experiments) is a booming and exciting area in
modern astrophysics and physics. This year is particularly exciting,
thank to the launch of Fermi gamma ray telescope (previously known
as GLAST) and operation of the large hadron collider (LHC).
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时间：9月5日下午2:00(Friday)
报告题目：Accretion states in
ultraluminous X-ray sources and stellar-mass black holes
报告人：Dr. Robert Soria (Mullard
Space Science Laboratory, University of College London)
地点：3楼中会议室
ABSTRACT
Spectral state transitions from accreting black holes (BHs)
are an indirect way to estimate the mass accretion rate
and the BH mass. Stellar-mass BHs tend to be dominated
by a thermal disk (disk-blackboby spectrum) when they are
in a luminous state, and a Comptonizing region
(power-law spectrum) at lower accretion rates.
Ultraluminous X-ray sources (ULXs) show different states,
and do not seem to have a pure disk state.
It is not clear whether this is due to a fundamental
difference in the accreting BH mass, the mass
transfer rate, or the type of donor star.
It is also unclear whether AGN accretion states
are more similar to those of stellar-mass BHs or ULXs.
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时间：8月25日 上午10：30
报告人：Eric Silver
(Harvard-Smithsonian CfA)
报告题目：APEX, The
Astrophysical Polarimetric Explorer
地点：3楼中会议室
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时间：8月8日上午 9：30
报告题目：SEARCHES FOR LIFE IN
THE UNIVERSE
报告人：Professor J.V.
Narlikar （Inter-University
Centre for Astronomy and Astrophysics, India
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IUCCA)
地点：楼中会议室
ABSTRACT
This talk will begin with a description of how vast is our
universe. It will then speculate on the
possibility of life in it,
preferably of the advanced type. Mention will be made of attempts to
contact such advanced extra-terrestrials. It will be argued that this
may
be a long drawn out procedure. In the second part of the talk there will
be a brief description of attempts by Indian scientists led by the
speaker
to sample air from heights up to 40 km above the Earth's surface.
Microorganisms have been found in these air samples, raising the
intriguing possibility that they may be extra-terrestrial. |
时间：8月8日上午 9：30
报告题目：SEARCHES FOR LIFE IN
THE UNIVERSE
报告人：Professor J.V.
Narlikar （Inter-University
Centre for Astronomy and Astrophysics, India
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IUCCA)
地点：三楼中会议室
ABSTRACT
This talk will begin with a description of how vast is our
universe. It will then speculate on the
possibility of life in it,
preferably of the advanced type. Mention will be made of attempts to
contact such advanced extra-terrestrials. It will be argued that this
may
be a long drawn out procedure. In the second part of the talk there will
be a brief description of attempts by Indian scientists led by the
speaker
to sample air from heights up to 40 km above the Earth's surface.
Microorganisms have been found in these air samples, raising the
intriguing possibility that they may be extra-terrestrial.
时间：7月22日 星期二 下午2：00
地点：三楼中会议室
报告人：Dr.
Yanlin Wu (Cornell University,
USA)
题目：Spitzer
Mid-Infrared Observations of Blue Compact Dwarf Galaxies
Abstract
Blue Compact Dwarf Galaxies (BCDs)
are galaxies that are characterized by their blue optical colors, low
luminosities and small sizes. BCDs are found to typically have low, subsolar,
metallicities and proposed to be used as local laboratory to study the star
formation in the early univesre. The unprecendented sensitivity of the
Spitzer Space Telescope has enabled us for the first time to detect a large
sample of these low luminosity systems, proving the presence/absence of the
Polycyclic Aromatic Hydrocarbon features. In addition, using the
high-resolution spectroscopy, we study the elemental abundances of neon and
sulfur in BCDs and compare with the results from optical studies. Finally,
we also analyse the FIR/radio correlation in low luminosity galaxies and
expand the discussion to the mid-IR.
时间：7月21日 星期一 下午2：00
地点：三楼中会议室
报告人：Professor
Xiaohui Fan (University of Arizona,
USA)
题目：The
Highest Redshift Quasars and the End of Reionization
Abstract：
Luminous quasars at high redshift provide direct probes of the evolution of
supermassive black holes (BHs) and the intergalactic medium (IGM) at early
cosmic time. Over the last six years, more than 20 quasars have been
discovered at z>6 from various wide-field surveys. Two main results emerge
from the studies of these quasars. Detections of such objects indicate the
existence of billion M_sun BHs merely a few hundred Myrs after the first
star formation in the Universe. They are surrounded by metal-enriched gas
and young galaxies with intense star formation, providing the strongest
constraints on early growth of supermassive BHs and co-evolution with their
host galaxies.
Meanwhile, Absorption spectra of the highest redshift quasars reveal
complete Gunn-Peterson absorption, indicating a rapid increase in the IGM
neutral fraction, marking the end of the reionization epoch at z~6,
suggesting a peak of reionization activity and emergence of the earliest
galaxies and AGNs at 6<15. These results strongly suggest that crucial
changes are happening at z~6-7. A number of ambitious near-IR surveys aiming
at finding quasars at z>7 will likely produce the first detection of quasars
in this crucial epoch in the next few years.
时间：7月4日 星期五 下午2：00
地点：三楼中会议室
报告人：Dr. Kang Xi (MPIA, Germany)
题目：Modeling satellite galaxy kinematics and luminosity
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时间：6月20日 星期五 下午2：00
地点：三楼中会议室
报告人：Prof. Jin Liping（Jilin University）
题目：Evolution of solar nebula and planet masses
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时间：6月19日 星期四 上午10：00
地点：三楼中会议室
报告人：Prof. David
Burrows(Dept. of Astronomy & Astrophysics, Penn State
University)
题目：Highlights of the
Swift GRB Mission
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时间：5月23日 星期五 下午2：00
地点：三楼中会议室
报告人：Dr. Tian Wenwu from NAOC
题目：通过HI+CO谱线观测决定河内超新星遗迹和相关联天体的距离
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时间：5月23日 星期五 上午10：00
地点：三楼中会议室
报告人：徐仁新（Department of Astronomy, Beijing University）
题目：Pulsars and Quark Stars
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时间：5月20日 星期二 下午3：00
地点：三楼中会议室
报告人：Dr. Yan, Huirong 闫慧荣
(Canadian Institute
for Theoretical Astrophysics，CITA)
题目：Nonlinear Cosmic Ray transport and acceleration in MHD turbulence
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时间：5月9日 星期五 下午3：00
地点：三楼中会议室
报告人：Prof. Wang Bin 王斌 （ Fudan University）
题目：Black Holes in the LHC
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时间：5月9日 星期五
上午10：00
地点：三楼中会议室
报告人：Prof. Li cheng
SHAO&MPA
题目：Connections of galaxy-galaxy
interactions to the formation of stars,
the
accretion of black holes, and
the structural changes of galaxies
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时间：4月28日 星期二
下午2：00
地点：三楼中会议室
报告人：陈学雷
（CHEN, Xuelei)
题目：Dark age, first stars and
reionization
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时间：4月24日 星期四
下午2：00
地点：三楼中会议室
报告人：Jiasheng Huang (Harvard-Smithsonian CfA)
题目：ULIRGs at high redshifts
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时间：4月17日 星期四 上午9:30am
地点：三楼中会议室
报告人：Pro.Richard Manchester（Australia
Telescope National Facility,
CSIRO）
题目：Pulsars and Gravity
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时间：4月15日 星期二 下午3：00
地点：三楼中会议室
报告人：周旭，朱镇熹
（中国南极天文中心，国家天文台，紫金山天文台）
题目：中国首次南极天文观测
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时间：4月11日 星期五 下午2：00
地点：三楼中会议室
报告人：张同杰（北京师范大学）
题目：Weak lensing and dark energy cosmology
时间：4月9日 星期三 下午2：00
地点：三楼中会议室
报告人：Prof. Chris Done, Durham
University, UK
题目：Accreting black holes
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时间：4月3日 星期四 下午2：00
地点：三楼中会议室
报告人：Prof. Kinwah Wu (Mullard Space Science Laboratory, University
College
London, UK)
题目：Emission from Accretion and Outflows of Black Holes: General
Relativistic Radiative Transfer
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时间：3月28日 星期五 下午2：00
地点：三楼中会议室
报告人：李淼
（科大）
题目：暗能量
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时间：2月29日 星期五 下午2：00
地点：三楼中会议室
报告人：August E. Evrard (University
of Michigan)
题目：Before the Deluge: Cosmology from Galaxy Cluster Surveys
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