2025 天文年會 (ASROC Annual Meeting)

Luminosity Functions of Galaxy Clusters in eROSITA Final Equatorial-Depth Survey

May 16, 2025, 5:45 PM

15m

International Conference Hall 圓形國際會議廳 (College of Management, National Formosa University 國立虎尾科技大學第三校區文理暨管理大樓)

Oral Extragalactic astronomy and cosmology

Speaker

HUNG-YU LIN (National Cheng Kung University)

Description

The galaxy luminosity function, which describes a number density of a galaxy population as a function of their luminosities, provides key insights into galaxy formation and evolution. In this study, we investigate the optical luminosity functions of galaxies in clusters identified in the eROSITA Final Equatorial-Depth Survey (eFEDS), spanning redshifts from 0.1 to 1.3 and halo masses between $10^{13}$ and $10^{15}\ M_\odot/h$. We use the Public Data Releases of the Hyper Suprime-Cam Subaru Strategic Survey. We conduct an empirical model to separate the red-sequence population from the whole galaxy population and conduct a statistical fore/background subtraction. We model the resulting luminosity functions using the Schechter function and constrain the parameters through Markov Chain Monte Carlo (MCMC) fitting. Finally, we examine how the Schechter parameters depend on cluster mass and redshift.