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THE SAMI GALAXY SURVEY: GALAXY INTERACTIONS AND KINEMATIC ANOMALIES IN ABELL 119
Oh, Sree,Yi, Sukyoung K.,Cortese, Luca,Sande, Jesse van de,Mahajan, Smriti,Jeong, Hyunjin,Sheen, Yun-Kyeong,Allen, James T.,Bekki, Kenji,Bland-Hawthorn, Joss,Bloom, Jessica V.,Brough, Sarah,Bryant, Ju American Astronomical Society 2016 The Astrophysical journal Vol.832 No.1
<P>Galaxy mergers are important events that can determine the fate of a galaxy by changing its morphology, star formation activity and mass growth. Merger systems have commonly been identified from their disturbed morphologies, and we now can employ integral field spectroscopy to detect and analyze the impact of mergers on stellar kinematics as well. We visually classified galaxy morphology using deep images (mu(r) = 28 mag arcsec(-2)) taken by the Blanco 4 m telescope at the Cerro Tololo Inter-American Observatory. In this paper we investigate 63 bright (M-r < - 19.3) spectroscopically selected galaxies in Abell 119, of which 53 are early type and 20 show a disturbed morphology by visual inspection. A misalignment between the major axes in the photometric image and the kinematic map is conspicuous in morphologically disturbed galaxies. Our sample is dominated by early-type galaxies, yet it shows a surprisingly tight Tully-Fisher relation except for the morphologically disturbed galaxies which show large deviations. Three out of the eight slow rotators in our sample are morphologically disturbed. The morphologically disturbed galaxies are generally more asymmetric, visually as well as kinematically. Our findings suggest that galaxy interactions, including mergers and perhaps fly-bys, play an important role in determining the orientation and magnitude of a galaxy's angular momentum.</P>
KYDISC: Galaxy Morphology, Quenching, and Mergers in the Cluster Environment
Oh, Sree,Kim, Keunho,Lee, Joon Hyeop,Sheen, Yun-Kyeong,Kim, Minjin,Ree, Chang H.,Ho, Luis C.,Kyeong, Jaemann,Sung, Eon-Chang,Park, Byeong-Gon,Yi, Sukyoung K. American Astronomical Society 2018 The Astrophysical journal Supplement series Vol.237 No.1
<P>We present the KASI-Yonsei Deep Imaging Survey of Clusters targeting 14 clusters at 0.015 less than or similar to z less than or similar to 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 mu(r' )similar to 27 mag arcsec(-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 (similar to 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.</P>
THE DEMOGRAPHICS OF GALACTIC BULGES IN THE SDSS DATABASE
Kim, Keunho,Oh, Sree,Jeong, Hyunjin,Aragó,n-Salamanca, Alfonso,Smith, Rory,Yi, Sukyoung K. American Astronomical Society 2016 The Astrophysical journal Supplement series Vol.225 No.1
<P>We present a new database of our two-dimensional bulge-disk decompositions for 14,233 galaxies drawn from Sloan Digital Sky Survey DR12 in order to examine the properties of bulges residing in the local universe (0.005 < z < 0.05). We performed decompositions in the g and r bands by utilizing the GALFIT software. The bulge colors and bulge-to-total ratios are found to be sensitive to the details in the decomposition technique, and hence we hereby provide full details of our method. The g - r colors of bulges derived are almost constantly red regardless of bulge size, except for the bulges in the low bulge-to-total ratio galaxies (B/T-r less than or similar to 0.3). Bulges exhibit similar scaling relations to those followed by elliptical galaxies, but the bulges in galaxies with lower bulge-to-total ratios clearly show a gradually larger departure in slope from the elliptical galaxy sequence. The scatters around the scaling relations are also larger for the bulges in galaxies with lower bulge-to-total ratios. Both the departure in slopes and larger scatters likely originate from the presence of young stars. The bulges in galaxies with low bulge-to-total ratios show signs of a frosting of young stars so substantial that their luminosity-weighted Balmer-line ages are as small as 1 Gyr in some cases. While bulges seem largely similar in optical properties to elliptical galaxies, they do show clear and systematic departures as a function of bulge-to-total ratio. The stellar properties and perhaps associated formation processes of bulges seem much more diverse than those of elliptical galaxies.</P>