The GMT-CfA, Carnegie, Catolica, Chicago Large Earth Finder (G-CLEF): A General-Purpose Optical Echelle Spectrograph for the GMT with Precision Radial Velocity Capability

Circumstellar Disk Evolution: Accretion, Transition Disks, & Planet Formation

Ultra-Precision Machining of Aspheric Molds for X-Ray Telescopes after ASTRO-H

The ASTRO-H project

Challenge to Asteroid Space Missions: From Hayabusa to Hayabusa 2

VLBI multi-epoch water maser observations toward star-forming regions

Exploring the Outer Solar System from Neptune to the Oort Cloud using Occultations of Stars

Gas and Galaxy Evolution in the Local Universe

국제우주정거장(ISS) 활용 우주실험

Cosmic Near-Infrared Background from the Early Universe: Case Study for MIRIS

High Resolution Stellar Spectroscopic Studies

A deeper look on thick discs using data from the Spitzer Survey of Stellar Structure in Galaxies (S4G)

Exploring the Terahertz Universe: Capabilities and Early results from the Herschel Space Observatory

Chasing Down Cosmic Acceleration

On the formation of massive galaxies

삼성탈레스의 광전자분야 연구내용소개

Protoplanetary Disks Revealed by CARMA

Luminosity Evolution of Type Ia Supernovae and Dark Energy

Diffusive Shock Acceleration Modeling of Radio Relics in Clusters of Galaxies

Cosmological shock waves result from supersonic flow motions induced by hierarchical clustering during the large-scale structure formation in the Universe. Suprathermal particles are known to be produced via plasma interactions at collisionless shocks in tenuous plasmas and they can be further accelerated to become cosmic rays (CRs) via diffusive shock acceleration (DSA). The presence of CR electrons has been inferred from observations of diffuse radio halos and relics in some merging galaxy clusters. We have calculated the emissions from CR electrons accelerated at weak planar shocks, using time-dependent DSA simulations that include energy losses via synchrotron emission and Inverse Compton scattering. The simulated nonthermal emission are used to model the synchrotron emission from several observed radio relics.

The Cosmic Dark Energy: the current status of theory and observation

The high-z type Ia supernova magnitude-redshift relation, large-scale structure of galaxies, and the cosmic microwave background observations suggest that the expansion rate of our universe is currently under acceleration. Especially, our cosmological framework demands the presence of substantial amount of dark energy with repulsive nature like the cosmological constant. In this talk I briefly review several dark energy models that have been proposed so far and summarize the current status of dark energy model constraints with astronomical observations, together with my recent research works on this issue.

Massive (> 10,000 solar mass) young star clusters and OB associations dominate the energetic feedback from stars into the interstellar medium. They contain the most massive and luminous stars in the Galaxy, which shape their environments through winds, ionizing flux, radiation pressure, and eventually supernovae, destroying natal molecular clouds and inflating superbubbles. We develop a method, based on differential extinction of the Galactic disk, to search for massive star clusters powering most luminous star forming complexes in the Galaxy identified in the WMAP foreground maps. As results, we identify 25 candidate clusters within 40 star forming complexes having extinctions consistent with their distances. One notable example is the discovery of the Dragonfish association which is the most luminous OB association in the Galaxy powering a giant nebula at 10 kpc across the Galactic plane. Using near-infrared spectroscopy, we identify two Luminous Blue Variable candidates, one Wolf-Rayet, 15 O-type stars (including one possible runaway) out of 50 sampled stars located within the boundary of this association, which is consistent with the expected total number of OB stars greater than 400. The mass of the Dragonfish association is 100,000 solar mass, similar to that of Westerlund 1 known to be the most massive star cluster. These results, hence, offer an important opportunity to study the formation and evolution of most massive star clusters. We will discuss ongoing and planned follow-up observations of these new massive star clusters as well as the development of Wide Integral Field Infrared Spectrograph which is ideal to study them.

The night sky appears to be quiet and stable, but in reality many explosive events are happening in the universe every night. Such events are now being caught efficiently with recent transient surveys, and rapid follow-up observations are revealing exciting nature of these explosive events. In this talk, we present our follow-up observation activities of interesting transient events. These studies cover a wide range of astronomoical events including Swift J1644+57, the moment of a supermassive black hole devouring a star, the Chirstmas burst, a peculliar GRB caused by a death of two stars colliding in a common envelope, and GRB 071025, an explosive stellar death at z ~ 5 which reveals the existence of SN-dust in the early universe. In addition, we also present our work on a very nearby supernova in M101 galaxy which occured very recently. These and future transient events will continue to show us fresh views of the universe.

I will talk about Akdeniz University which is one of the magnet university in Turkey for scientist and students because of its location, infrastructure and intellectual capacity. Then introduce technical capacity of Antalya Technopolis and opportunity for co-operation. Also I will discus about recently established Department of Space Sciences and Technologies and our projects such as establishing 4 meter infrared telescope.

Space provides to mankind experimenting on extreme limiting conditions that are not possible on Earth. Therefore, one of the peaceful application of space technology is its usage on improving science in general, specifically space sciences itself. Since capacity building for a country cannot be done without being aware of the current status in general. This presentation aims to present basic astronomy and space sciences research and education in Turkey.

ALMA's unprecedented sensitivity and angular resolution at millimeter and submillimeter wavelengths will undoubtedly advance the vast frontiers of our knowledge about the universe. I will present expected impacts of ALMA on the studies of star and planetary system formation, in addition to the introduction of its basic capabilities. The sensitivity of ALMA to the optically thin thermal dust emission located at a nearby star forming region 100 pc away is as small as 1/100 of the earth mass in its beam size of ~1 AU, more than 100 times in sensitivity and 30 times in resolution than the currently available radio interferometers. ALMA is also expected to achieve an angular resolution of 0.1 arcsec or better for line observations, revealing detailed kinematics related to planet formation in disks. With such superb capabilities expected for ALMA, I will discuss fundamental questions of star and planetary system formation that we hope to answer with ALMA.

세종은 독자적으로 한양을 중심으로 한 자주적인 역(曆)을 편찬하도록 했다. 역을 편찬하는데 가장 기본이 되는 것은 태양, 달, 오행성, 항성들의 위치를 관측하고 또한 정밀한 시간을 측정해 하늘의 움직임을 정확히 계산해 내는 것이다. 세종은 1432년부터 본격적인 천문기기 제작을 시작했는데 이는 주로 이천과 천재 기술자 장영실이 맡았다. 특별히 천문기기 제작은 고대의 이상적인 성군(聖君)으로 성왕(聖王)이라 추앙받는 요(堯)와 순(舜) 임금이 했듯이 단지 천문학적인 행위만이 아니라 제왕 된 자가‘하늘을 받드는 정치’를 함에 무엇보다 먼저 앞서서 행해야할 중요한 사안으로 태평성대를 이룬 요순의 뜻을 받드는 옛 제도(古制)를 처음 회복한 것이다. 드디어 1433년 경복궁 안에 높이 9.4m 길이 14.4m의 거대한 천문대인 간의대(簡儀臺)를 세우고 청동을 부어 간의(簡儀)를 만들어 설치했다. 간의대 서편에는 24기(氣, 절기)를 측정하는 높이 8m 길이 25m의 규표를 설치했다. 세종은 종합 천문대인 간의대 주변에 간의의 구조와 기능을 개선하여 조선의 실정에 맞게 다목적 기능의 소형의 각종 관측기기인 소간의, 일성정시의와 앙부일구, 현주일구 등 각종 해시계를 창제하였다. 그 외에도 혼의혼상(혼천의와 천구의)각과 자격루와 옥루 등의 자동화를 구현하는 첨단적인 시설을 갖추어 실로 경복궁을 조선의 첨단 과학기술의 연구 시설을 만들었다. 세종 시대 간의대를 비롯한 천문시설들의 창제품들은 당대로서는 세계 최대 규모로 오늘날 인정받고 있다. 15세기 조선의 천문학이 세계적인 수준에 이른 것은 중요한 국책사업으로 적극적인 지원과 축적된 전통과학 기술, 창조적 재능을 지닌 학자와 장영실 같은 기술자가 있었기에 가능했다. 세종 당시 제작한 천문의기들 중 현존하는 유물은 단 하나도 없는 아쉬움이 있지만 최근 문헌 연구를 바탕으로 설계와 작동모델의 복원연구를 통해 다수 복원을 수행하였다. 그러나 아직도 세계적인 창제물인 옥루와 혼의혼상각 등 주요 유물들은 연구단계에 머무르고 있다. 지금까지 수행한 복원연구를 통해 세종시대 천문의기의 특성과 앞으로 복원방향을 제시하고자 한다.

Active galactic nuclei (AGN) are among the most powerful sources of radiation in the universe. As far as we understand today, their source of energy is accretion of matter into supermassive black holes with millions to billions of solar masses. AGN and their most prominent features - jets - are easy to observe in radio. I present results of a long-term monitoring program of luminous AGN covering timelines of 14 years. We find strong variability even on timescales of many years. From the emission statistics we conclude that the properties of AGN emission are more complex than commonly assumed.

Planet formation takes place rapidly in the disks around young stars. In order to understand the process, we must understand the nature and evolution of the youngest stars, the physics of the protoplanetary disks, and the formation timescale and properties of the exoplanets themselves. I will report on current research in my group on all three aspects of the problem using infrared imaging and spectroscopy, including observations and modeling of young stars and their disks, direct observations of young, very low mass objects, and radial velocity searches for young planets. The new IR spectrographs being built jointly by KASI and UT, IGRINS and GMTNIRS, will be decisive in revealing the details of planet formation. I will discuss some of the ways in which these instruments will move us from the era of discovery to one in which we can gain a quantitative understanding of planet formation.