Publication in Refereed Journals

Curriculum Vitae


Myungkook James Jee (지명국)

Department of Astronomy , Yonsei University
50 Yonsei-ro, Seodaemun-gu, Seoul
Phone: +82-2-2123-2684 Email:

Ph.D. 2005, Johns Hopkins University

James leads YOUNG (Yonsei Observable UNiverse Group), that is conducting the following projects.
ACS Point Spread Function
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Research Interests
Gravitational Lensing, Cosmology, Galaxy Clusters, Large Scale Structure, Astronomical Instrumentation
Recent Science Highlights Featured in NASA news
el_gordo Double Whammy -Astronomers have discovered what happens when the eruption from a supermassive black hole is swept up by the collision and merger of two galaxy clusters. This composite image contains X-rays from Chandra (blue), radio emission from the GMRT (red), and optical data from Subaru (red, green, and blue) of the colliding galaxy clusters called Abell 3411 and Abell 3412. These and other telescopes were used to analyze how the combination of these two powerful phenomena can create an extraordinary cosmic particle accelerator. (01/06/2017) Read details

Related Papers:
The case for electron re-acceleration at galaxy cluster shocks (van Weeren et al. 2017)
el_gordo EL GORDO -If someone told you there was an object in space called "El Gordo" (Spanish for "the fat one") you might imagine some kind of planet-eating monster straight out of a science fiction movie. The nickname refers to a monstrous cluster of galaxies that is being viewed at a time when the universe was just half of its current age of 13.8 billion years (04/04/2014). Read details

Related Papers:
1. Weighing "El Gordo" with a Precision Scale: Hubble Space Telescope Weak-lensing Analysis of the Merging Galaxy Cluster ACT-CL J0102–4915 at z = 0.87 (Jee et al. 2014)
2. The Atacama Cosmology Telescope: ACT-CL J0102-4915 "El Gordo," a Massive Merging Cluster at Redshift 0.87 (Menanteau et al. 2012)
3. The return of the merging galaxy subclusters of El Gordo? (Ng et al. 2015)
Dark matter Cosmic Train Wreck - Astronomers observed what appeared to be a clump of dark matter left behind during a bizarre wreck between massive clusters of galaxies. The dark matter collected into a "dark core" containing far fewer galaxies than would be expected if the dark matter and galaxies hung together (03/02/2012). Read details

Related Papers:
1. Hubble Space Telescope/Advanced Camera for Surveys Confirmation of the Dark Substructure in A520 (Jee et al. 2014)
2. On Dark Peaks and Missing Mass: A Weak-lensing Mass Reconstruction of the Merging Cluster System A520 (Clowe et al. 2012)
3. A Study of the Dark Core in A520 with the Hubble Space Telescope: The Mystery Deepens (Jee et al. 2012)
4. A Dark Core in Abell 520 (Mahdavi et al. 2007)
Current Projects
LSST Large Synoptic Survey Telescopes (LSST) - The LSST, currently under construction in Chile, is designed to conduct a ten-year survey of the dynamic universe. LSST will scan the entire visible sky in just a few nights; each panoramic snapshot with the 3200-megapixel camera covers an area 40 times the size of the full moon. LSST will map the structure of the Milky Way and the large scale structure of the universe and address the nature of dark matter and dark matter.

Related papers:
1. LSST Science Book, Version 2.0
2. Toward Precision LSST Weak-Lensing Measurement. I. Impacts of Atmospheric Turbulence and Optical Aberration (Jee & Tyson 2011)
MOO1014 SeeChange - We were awarded 168 HST orbits to image more than 10 galaxy clusters at z>1. These clusters are the most massive clusters known to date in the z>1 regime. We will measure the time variation of dark energy using Type Ia SNe. In addition, Weak lensing (WL) cluster-masses derived from our imaging will allow us to perform the first calibration of the Sunyaev-Zeldovich (SZ)-mass relation at z > 1 at the level of precision required to make SZ-derived masses competitive as strong measurements of dark energy.
MCC Merging Cluster Collaboration (MC2) - Merging galaxy clusters are receiving growing attention because of their potential to provide constraints on properties of dark matter, which is gravitationally the most dominant constituent of galaxy clusters. We recently launched a Merging Cluster Collaboration (MC2) project with aims to enhance our understanding of cluster physics and constrain properties of dark matter from systematically analyzing a number of prominent merging clusters.

Related Papers:
1. MC 2: Constraining the Dark Matter Distribution of the Violent Merging Galaxy Cluster CIZA J2242.8+5301 by Piercing through the Milky Way (Jee et al. 2015)
2. MC2: Galaxy Imaging and Redshift Analysis of the Merging Cluster CIZA J2242.8+5301 (Dawson et al. 2015)