## The SAMI Galaxy Survey: Mass as the Driver of the Kinematic Morphology-Density Relation in Clusters

### Description

We examine the kinematic morphology of early-type galaxies (ETGs) in eight galaxy clusters in the Sydney-AAO Multi-object Integral-field spectrograph Galaxy Survey. The clusters cover a mass range of $14.2\,\lt \mathrm{log}({M}_{200}/{M}_{\odot })\lt 15.2$ and we measure spatially resolved stellar kinematics for 315 member galaxies with stellar masses $10.0\lt \mathrm{log}({M}_{* }/{M}_{\odot })\leqslant 11.7$ within 1 R 200 of the cluster centers. We calculate the spin parameter, λ R , and use...[Show more]

dc.contributor.author Brough, Sarah van de Sande, J Owers, Matthew D'Eugenio, Francesco Sharp, Rob Cortese, L Scott, Nicholas Medling, Anne Sweet, Sarah Bland-Hawthorn, Joss Bryant, J. Drinkwater, Michael John Tonini, C Lawrence, J Lawrence, J S Richards, Samuel 2020-12-20T20:58:12Z 2020-12-20T20:58:12Z 0004-637X http://hdl.handle.net/1885/218517 We examine the kinematic morphology of early-type galaxies (ETGs) in eight galaxy clusters in the Sydney-AAO Multi-object Integral-field spectrograph Galaxy Survey. The clusters cover a mass range of $14.2\,\lt \mathrm{log}({M}_{200}/{M}_{\odot })\lt 15.2$ and we measure spatially resolved stellar kinematics for 315 member galaxies with stellar masses $10.0\lt \mathrm{log}({M}_{* }/{M}_{\odot })\leqslant 11.7$ within 1 R 200 of the cluster centers. We calculate the spin parameter, λ R , and use this to classify the kinematic morphology of the galaxies as fast or slow rotators (SRs). The total fraction of SRs in the ETG population is F SR = 0.14 ± 0.02 and does not depend on host cluster mass. Across the eight clusters, the fraction of SRs increases with increasing local overdensity. We also find that the slow-rotator fraction increases at small clustercentric radii (R cl < 0.3 R 200), and note that there is also an increase in the slow-rotator fraction at R cl ~ 0.6 R 200. The SRs at these larger radii reside in the cluster substructure. We find that the strongest increase in the slow-rotator fraction occurs with increasing stellar mass. After accounting for the strong correlation with stellar mass, we find no significant relationship between spin parameter and local overdensity in the cluster environment. We conclude that the primary driver for the kinematic morphology–density relationship in galaxy clusters is the changing distribution of galaxy stellar mass with the local environment. The presence of SRs in the substructure suggests that the cluster kinematic morphology–density relationship is a result of mass segregation of slow-rotating galaxies forming in groups that later merge with clusters and sink to the cluster center via dynamical friction. application/pdf en_AU IOP Publishing The Astrophysical Journal The SAMI Galaxy Survey: Mass as the Driver of the Kinematic Morphology-Density Relation in Clusters Journal article Imported from ARIES 844 2017 020110 - Stellar Astronomy and Planetary Systems a383154xPUB7545 Published Version Brough, Sarah, Australian Astronomical Observatory van de Sande, J, University of Sydney Owers, Matthew, Macquarie University D'Eugenio, Francesco, College of Science, ANU Sharp, Rob, College of Science, ANU Cortese, L, University of Western Australia Scott, Nicholas, University of Sydney Medling, Anne, College of Science, ANU Sweet, Sarah, College of Science, ANU Bland-Hawthorn, Joss, University of Sydney Bryant, J., University of Sydney Drinkwater, Michael John, University of Queensland Tonini, C, University of Melbourne Lawrence, J, Australian Astronomical Observatory Lawrence, J S, Australian Astronomical Observatory Richards, Samuel, University of Sydney 1 10.3847/1538-4357/aa7a11 2020-11-23T11:20:24Z 2-s2.0-85026359665 000406015000022 ANU Research Publications