> Topics    

     Our research activities span a wide range of topics related to galaxy evolution and
     formation, and also include instrumentation development projects for new discoveries.

- Observational Cosmology
       - Galaxy Evolution and Formation at Low to High Redshift
       - Early-type Galaxies Near and Far
       - Supermassive Black Holes and Active Galactic Nuclei
       - High Redshift Quasars and Their Evolution
       - Galaxy Evolution Modeling
       - Image Simulation
       - Gamma-ray Burst
       - Gravitational Lensing
       - Distant Supernovae
       - Exoplanet Transit
       - Astronomical Instrumentation
       - Theoretical Modeling of Black Hole Merging                                                                           - Progenitor of Supernovae via Very Early Light Curve                                                             - Optical/IR Follow up of EM Counterpart of Gravitational Wave Source

> Scientific Programs

    CEOU is performing or involved in the following research projects

1. IMS - Intermediate-wide, Medium-deep Survey
   This is a UKIRT NIR imaging survey covering over 200 square degree to a depth of J~23 AB magnitude. We will study high redshift quasars (z~7), high redshift clusters and proto-clusters, and galaxy evolution over the cosmic period. CEOU is leading this project, with participants from ASIAA and National Central University in Taiwan, and Pomona College in USA. NASA Swift team is also involved in the GRB follow-ups in the IMS.


 2. SNUQSO - Seoul National University Bright Quasar Survey in Optical
   This is a spectroscopic survey of bright quasars uncovered by other large area surveys. Emphasis is mainly given to low galactic latitude quasars. We have discovered over 200 bright quasars from this survey using facilities such as BOAO 1.8m, KPNO 2.1m, and CTIO 1.5m. CEOU/SNU is the main institution for this study, while there have been small levels of collaboration with other institutes in Korea, such as KIAS, and IUCAA in India.

   3. QSONG
- Quasars Spectroscopic Observation with NIR Grism
   This is a Phase-3 mission program for AKARI. We have taken 2.5 - 5 micron spectra of about 200 quasars at 3.4 < z < 6.42, to understand the evolution of super-massive black holes (SMBHs) in the early history of the universe. The mission program also observes PG quasars and rebeveration mapped AGN at low redshift to provide NIR line diagnostics to understand SMBH and AGN activities. CEOU personnel take a leading role of this project and work together with astronomers from SNU in Korea, ISAS/JAXA in Japan, and ASIAA in Taiwan.

4.  AMUSES - AKARI 1 MJy Unbiased Extragalactic Survey
   AMUSE is another mission program of AKARI (Phase-3b). It focuses on the 2.5-5 micron properties of 5 mJy selected sources of the Spitzer Legacy program, 5MUSES (5mJy Unbiased  Extragalactic Survey). We attempt to bridge the gap between Spitzer and ground-based spectroscopy data, providing information on lines such as 3.3 micron PAHs for star formation in  distant galaxies. CEOU personnel take a lead in this project, and work together with  astronomers at SNU/Korea, ISAS/JAXA, and the Spitzer Legacy team at SSC/Caltech.

   5. CLEVL - Cluster Evolution Survey
   This is an AKARI mission program. We have taken 2-24 micron imaging data of 7 low redshift merging clusters, intermediate redshift clusters, and high redshift radio galaxy field where proto-clusters are expected to form. The collaboration team includes astronomers in Korea, Japan, and United Kingdom.

   6. SNUGRB - Seoul National University Gamma-Ray Burst Follow-up
   In collaboration with EAFON, we are conducting follow-up observations of GRBs in optical to Y-band, using the Mt. Lemmon 1-m telescope in Tucson, AZ, USA, small telescopes in Korea (BOAO, SOAO, and SNU observatories), and the Maidanak 1.5m telescope in Uzbekistan.

7. Sloan Digital Sky Survey II
   CEOU has been participating SDSS-II as a member of the Korean Scientists group. Our major activity for SDSS-II is the SNe survey, but we also have worked on projects regarding AGN/quasars and galaxy properties.

 8. AKARI North Ecliptic Pole (NEP) Survey
   Our group is actively involved in the AKARI NEP Survey. We have carried out an extensive ground-based follow-up observations of the NEP-Wide/NEP-Deep survey fields, including BRIJH imaging of the entire NEP-Wide area, and spectroscopic observation of ~1700 AKARI IR sources  with MMT/WIYN.
9. Spitzer First Look Survey
   CEOU personnel have been invoved in the Spitzer First Look Survey, especially in the study of of massive Lyman break galaxies.

10. AEGIS- All - wavelength Extend Groth Strip International Study
   We contribute to AEGIS through 15 micron imaging of the entire Extended Groth Strip.

11. IMSNG - Intensive Monitoring Survey of Nearby Galaxies
We are monitoring 40 nearby UV bright galaxies with optical/infrared telescopes all around the world for a cadence within a day to catch very early moments of supernova explosions. Using these data, we are carrying studies to give constrains of its progenitor scenarios.

12. GECKO - Gravitatioanl wave Electromagnetic Counterpart Korean Observatory




Astronomy Program, Department of Physics and Astronomy, Seoul National University , 599 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea
Tel:+82-2-880-6761  Fax:+82-2-885-5512