Research Page

I measure how galaxies build up their stellar mass and how that stellar mass is distributed through a galaxy cluster. Dense spectroscopic surveys of nearby clusters supply the member catalogs, and SED fitting converts galaxy light into stellar masses and star-formation rates. From there I recover the three-dimensional structure of a cluster from what we observe in projection, extend the measurements from the optical into the infrared and the radio, and compare the results with cosmological simulations such as IllustrisTNG.

Jong-In Park's 1st-Author Papers (ADS Library) Jong-In Park's All Papers (ADS Library) Jong-In Park's ORCID Jong-In Park's Google Scholar

Selected Publications

MACH

The Stellar Mass Function for Nine Massive Galaxy Clusters in the Local Universe

Jong-In Park, Jubee Sohn, Margaret J. Geller, Kenneth J. Rines, Antonaldo Diaferio

The Astrophysical Journal · 2026

ADS arXiv DOI Github
A2199

A redshift survey of the nearby galaxy cluster Abell 2199: No upturn of the faint-end slope of galaxy luminosity function

Jong-In Park, Hyunmi Song, Ho Seong Hwang

Journal of the Korean Astronomical Society · 2026

ADS arXiv DOI Github
Weak lensing A85

Weak-Lensing Analysis of the Galaxy Cluster Abell 85: Constraints on the Merger Scenarios of Its Southern Subcluster

Soojin Kim, Kim HyeongHan, Wonki Lee, Jong-In Park, M. James Jee, Ho Seong Hwang

The Astrophysical Journal · 2026

ADS arXiv DOI

Projects

Each card links to a project page with more detail.

PEEL

PEEL

Projection-to-Enclosed Estimator by Layers: an analytical deprojection model that recovers 3D stellar mass profiles and stellar mass fractions of galaxy clusters from projected data. Paper in preparation.

Read more → HI Mapping on A2029

HI Mapping on A2029

Predicting the cold-gas (HI) content of Abell 2029 members from optical/UV data, in support of a MeerKAT HI survey proposal.

Read more → SPHEREx

SPHEREx

Extensive multi-band SED fitting analysis using SPHEREx IR data.

Read more →



Talks & Posters

Talks

  • Star Formation Rate Measurement in Galaxy Clusters using SPHEREx 2026 SPHEREx Workshop, Jeju, 2026-08-13
  • The Stellar Mass Function of Nine Massive Clusters in the Local Universe Spring 2026 Korean Astronomical Society Meeting, Suwon, 2026-04-10
  • Galaxy Stellar Mass Function of Local Massive Clusters Based on Dense Spectroscopy · YouTube link CL2025: Entering a Golden Age of Galaxy Cluster Studies, ASIAA, 2025-09-23
  • The Galaxy Stellar Mass Function of Very Massive Clusters The 2nd Workshop on Galaxies and Dark Matter, Seoul National University, 2024-02-27

Posters

  • Measuring The Stellar Mass Function of Massive Galaxy Clusters using Dense Spectroscopic Surveys (Jong-In Park, Jubee Sohn), 2023 Fall Korean Astronomical Society Meeting, Jeju, 2023-10
  • Stellar Mass and Luminosity Function of Extremely low-mass clusters (Anthony McCarthy, Jong-In Park, Jubee Sohn), 2025 Spring Korean Astronomical Society Meeting, 2025-04
  • Weak-Lensing Analysis of the Galaxy Cluster Abell 85: Implications for the Merger Scenario of Its Southern Subcluster (Soojin Kim, Kim HyeongHan, Wonki Lee, Jong-In Park, Ho Seong Hwang), 2025 Merging Clusters Workshop, 2025-10