Research

Ongoing & Previous Research Projects

Galaxy Rotation Curves

Galaxy Rotation Curves Recent studies have found the diverse rotation curves of galaxies using observational data. We use the IllustrisTNG cosmological hydrodynamical simulation to reproduce the observational results and to figure out the cause of...

Galaxy Clusters (SPHEREx + Kinematics)

Galaxy Clusters (SPHEREx + Kinematics) Image credit: NASA, ESA, CSA, STScI, Jose M. Diego (IFCA), Jordan C. J. D’Silva (UWA), Anton M. Koekemoer (STScI), Jake Summers (ASU), Rogier Windhorst (ASU), Haojing Yan (University of Missouri)...

ODIN (High-z LSS)

ODIN (High-z LSS) [Figure 10 of Ramakrishnan et al. 2023] ODIN (High-z LSS). One-hundred-deg2 DECam Imaging in Narrow-bands (ODIN) survey is an ongoing project to identify Lyman alpha emitters (LAEs) at redshifts 2.4, 3.1, and...

Milky Way (GAIA + dark matter subhalos)

Milky Way (GAIA + dark matter subhalos): Dark matter (DM) is one of the key ingredients of the Lambda Cold Dark Matter (LCDM) model. It provides the basis for the current structure of the universe...

Dark galaxy (Simulations + Observations)

Dark galaxy (Simulations + Observations) credits: Teymoor Saifollahi and NASA/HST (HST Proposal 14643, PI: van Dokkum) Dark galaxies, with little or no stars, are predicted by the hierarchical galaxy formation model within Lambda Cold Dark...

Cosmological Simulations (Hydro + Multiverse)

Cosmological Simulations (Hydro + Multiverse) (Credit: Kim, J., Park, C., Rossi, G., Lee, S. M., & Gott, J.R. 2010, Journal of Korean Astronomical Society, 44, 217) The ΛCDM model predicts that our universe consists of...

Alternative Theories of Gravity

Alternative Theories of Gravity (image credit: Wikimedia commons) While ΛCDM cosmology has successfully described our Universe, the elusive physical origin and characteristics of dark matter, a fundamental component, remain poorly understood despite its ubiquitous presence....

A-SPEC/K-SPEC (Survey + Instrument)

A-SPEC/K-SPEC (Survey + Instrument) The K-SPEC project aims to develop a multi-object spectrograph (MOS) system for the all-sky spectroscopic survey, A-SPEC. As part of K-SPEC, we plan to install the MOS system at the KMTNet...