Browsing by Author "Yi, Sukyoung K."

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    Discovery of Ram-pressure stripped gas around an Elliptical Galaxy in Abell 2670.
    (2017) Sheen, Yun-Kyeong; Treister, Ezequiel; Smith, Rory; Jaffé, Yara; Kim, Minjin; Yi, Sukyoung K.; Duc, Pierre-Alain; Nantais, Julie; Candlish, Graeme; Demarco, R.
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    Distribution of Merging and Post-merger Galaxies in Nearby Galaxy Clusters
    (2024) Kim, Duho; Sheen, Yun-Kyeong; Jaffe, Yara L.; Kelkar, Kshitija; Ranjan, Adarsh; Piraino-Cerda, Franco; Crossett, Jacob P.; Lourenco, Ana Carolina Costa; Martin, Garreth; Nantais, Julie B.; Demarco, Ricardo; Treister, Ezequiel; Yi, Sukyoung K.
    We study the incidence and spatial distribution of galaxies that are currently undergoing gravitational merging (M) or that have signs of being post-merger (PM) in six galaxy clusters (A754, A2399, A2670, A3558, A3562, and A3716) within the redshift range of 0.05 less than or similar to z less than or similar to 0.08. To this aim, we obtained Dark Energy Camera mosaics in the u ' , g ' , and r ' bands covering up to 3 x R 200 of the clusters, reaching 28 mag arcsec-2 surface brightness limits. We visually inspect u ' g ' r ' color-composite images of volume-limited (M r < -20) cluster member galaxies to identify whether galaxies are of M or PM type. We find 4% M-type and 7% PM-type galaxies in the galaxy clusters studied. By adding spectroscopic data and studying the projected phase-space diagram (PPSD) of the projected clustocentric radius and the line-of-sight velocity, we find that PM-type galaxies are more virialized than M-type galaxies, having a 1%-5% higher fraction within the escape-velocity region, while the fraction of M-type was similar to 10% higher than the PM type in the intermediate environment. Similarly, on a substructure analysis, M types were found in groups in the outskirts, while PM-type populated groups were found in ubiquitous regions of the PPSD. Adopting literature-derived dynamical state indicator values, we observed a higher abundance of M types in dynamically relaxed clusters. This finding suggests that galaxies displaying post-merger features within clusters likely merged in low-velocity environments, including clusters outskirts and dynamically relaxed clusters.
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    HST WFC3/IR Observations of Active Galactic Nucleus Host Galaxies at z ~ 2 : Supermassive Black Holes Grow in Disk Galaxies.
    (2011) Schawinski, Kevin; Treister, Ezequiel; Urry, C. Meg; Cardamone, Carolin N.; Simmons, Brooke; Yi, Sukyoung K.
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    Recent Galaxy Mergers and Residual Star Formation of Red Sequence Galaxies in Galaxy Clusters
    (2016) Sheen, Yun-Kyeong; Treister, Ezequiel; Yi, Sukyoung K.; Ree, Chang H.; Jaffé, Yara; Demarco, R.