Distribution of merging and post-merging galaxies in nearby galaxy clusters

Abstract

We study the incidence and spatial distribution of galaxies that are currently undergoing gravitational merging (M) or that have signs of a post merger (PM) in six galaxy clusters (A754, A2399, A2670, A3558, A3562, and A3716) within the redshift range, 0.05$\lesssim$$z$$\lesssim$0.08. To this aim, we obtained Dark Energy Camera (DECam) mosaics in $u^{\prime }$, $g^{\prime }$, and $r^{\prime }$-bands covering up to $3\times R_{200}$ of the clusters, reaching 28 mag/arcsec${}^2$ surface brightness limits. We visually inspect $u^{\prime }$$g^{\prime }$$r^{\prime }$ color-composite images of volume-limited ($M_r<-20$) cluster-member galaxies to identify whether galaxies are of M or PM types. 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 1--5% point higher fraction within the escape-velocity region, while the fraction of M-type was $\sim$10% point higher than PM-type in the intermediate environment. Similarly, on a substructure analysis, M types were found in the outskirt groups, while PM types populated groups 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-merging features within clusters likely merged in low-velocity environments, including cluster outskirts and dynamically relaxed clusters.

23 pages, 15 figures, 4 tables, Published in ApJ. For photometric catalogs and associated information, see https://data.kasi.re.kr/vo/DECam_catalogs/

References in corpus (26)

• Formation of Massive Galaxies at High Redshift: Cold Streams, Clumpy Disks and Compact Spheroids
• Galaxy Merger Morphologies and Time-Scales from Simulations of Equal-Mass Gas-Rich Disc Mergers
• Tracing Galaxy Formation with Stellar Halos II: Relating Substructure in Phase- and Abundance-Space to Accretion Histories
• The Structures of Distant Galaxies - III: The Merger History of over 20,000 Massive Galaxies at z < 1.2
• Ongoing Assembly of Massive Galaxies by Major Merging in Large Groups and Clusters from the SDSS
• How to quench a galaxy
• Discovery of a Giant Stellar Tidal Stream Around the Disk Galaxy NGC 4013
• Physical properties of SDSS satellite galaxies in projected phase-space
• OmegaWINGS: spectroscopy in the outskirts of local clusters of galaxies
• Hiding in plain sight: An abundance of compact massive spheroids in the local Universe
• On the lifetime of merger features of equal-mass disk mergers
• Preparing for low surface brightness science with the Vera C. Rubin Observatory: characterisation of tidal features from mock images
• The rise and fall of star-formation in $\mathbf{z}\sim 0.2$ merging galaxy clusters
• The Fornax Deep Survey with VST. VIII. Connecting the accretion history with the cluster density
• MC${}^2$: Boosted AGN and star-formation activity in CIZA J2242.8+5301, a massive post-merger cluster at z=0.19
• The Argo Simulation: II. The Early Build-up of the Hubble Sequence
• Introducing the LBT Imaging of Galactic Halos and Tidal Structures (LIGHTS) survey. A preview of the low surface brightness Universe to be unveiled by LSST
• Galaxy Activity in Merging Binary Galaxy Clusters
• The limited role of galaxy mergers in driving stellar mass growth over cosmic time
• Extremely massive disc galaxies in the nearby Universe form through gas-rich minor mergers
• High density of active galactic nuclei in the outskirts of distant galaxy clusters
• The Effect of Minor and Major Mergers on the Evolution of Low Excitation Radio Galaxies
• Pre- and post-processing of cluster galaxies out to $5\times R_{200}$: The extreme case of A2670
• The dynamical state of Abell 2399: a bullet-like cluster
• ATCA observations of the galaxy cluster Abell 3921 - I. Radio emission from the central merging sub-clusters
• Preprocessing in small groups: Three simulated galaxies interacting prior to cluster infall