Astrophys. J., Suppl. Ser., 237, 14-14 (2018/July-0)
KYDISC: galaxy morphology, quenching, and mergers in the cluster environment.
OH S., KIM K., LEE J.H., SHEEN Y.-K., KIM M., REE C.H., HO L.C., KYEONG J., SUNG E.-C., PARK B.-G. and YI S.K.
Abstract (from CDS):
We present the KASI-Yonsei Deep Imaging Survey of Clusters targeting 14 clusters at 0.015 <= z <= 0.144 using the Inamori Magellan Areal Camera and Spectrograph on the 6.5 m Magellan Baade telescope and the MegaCam on the 3.6 m Canada-France-Hawaii Telescope. We provide a catalog of cluster galaxies that lists magnitudes, redshifts, morphologies, bulge-to-total ratios, and local density. Based on the 1409 spectroscopically confirmed cluster galaxies brighter than -19.8 in the r band, we study galaxy morphology, color, and visual features generated by galaxy mergers. We see a clear trend between morphological content and cluster velocity dispersion, which was not presented by previous studies using local clusters. Passive spirals are preferentially found in a highly dense region (i.e., cluster center), indicating that they have gone through environmental quenching. In deep images (µr' ∼ 27 magarcsec–2), 20% of our sample shows signatures of recent mergers, which is not expected from theoretical predictions and a low frequency of ongoing mergers in our sample (∼4%). Such a high fraction of recent mergers in the cluster environment supports a scenario that the merger events that made the features have preceded the galaxy accretion into the cluster environment. We conclude that mergers affect a cluster population mainly through the preprocessing of recently accreted galaxies.
© 2018. The American Astronomical Society. All rights reserved.
galaxies: clusters: general - galaxies: evolution - galaxies: fundamental parameters - galaxies: interactions - catalogs
VizieR on-line data:
<Available at CDS (J/ApJS/237/14): table3.dat table10.dat>
Table 10: [OKL2018] ANNNN NNNNN N=1409.
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