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

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

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.authorBrough, Sarah
dc.contributor.authorvan de Sande, J
dc.contributor.authorOwers, Matthew
dc.contributor.authorD'Eugenio, Francesco
dc.contributor.authorSharp, Rob
dc.contributor.authorCortese, L
dc.contributor.authorScott, Nicholas
dc.contributor.authorMedling, Anne
dc.contributor.authorSweet, Sarah
dc.contributor.authorBland-Hawthorn, Joss
dc.contributor.authorBryant, J.
dc.contributor.authorDrinkwater, Michael John
dc.contributor.authorTonini, C
dc.contributor.authorLawrence, J
dc.contributor.authorLawrence, J S
dc.contributor.authorRichards, Samuel
dc.date.accessioned2020-12-20T20:58:12Z
dc.date.available2020-12-20T20:58:12Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/218517
dc.description.abstractWe 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.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherIOP Publishing
dc.sourceThe Astrophysical Journal
dc.titleThe SAMI Galaxy Survey: Mass as the Driver of the Kinematic Morphology-Density Relation in Clusters
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume844
dc.date.issued2017
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationa383154xPUB7545
local.type.statusPublished Version
local.contributor.affiliationBrough, Sarah, Australian Astronomical Observatory
local.contributor.affiliationvan de Sande, J, University of Sydney
local.contributor.affiliationOwers, Matthew, Macquarie University
local.contributor.affiliationD'Eugenio, Francesco, College of Science, ANU
local.contributor.affiliationSharp, Rob, College of Science, ANU
local.contributor.affiliationCortese, L, University of Western Australia
local.contributor.affiliationScott, Nicholas, University of Sydney
local.contributor.affiliationMedling, Anne, College of Science, ANU
local.contributor.affiliationSweet, Sarah, College of Science, ANU
local.contributor.affiliationBland-Hawthorn, Joss, University of Sydney
local.contributor.affiliationBryant, J., University of Sydney
local.contributor.affiliationDrinkwater, Michael John, University of Queensland
local.contributor.affiliationTonini, C, University of Melbourne
local.contributor.affiliationLawrence, J, Australian Astronomical Observatory
local.contributor.affiliationLawrence, J S, Australian Astronomical Observatory
local.contributor.affiliationRichards, Samuel, University of Sydney
local.bibliographicCitation.issue1
local.identifier.doi10.3847/1538-4357/aa7a11
dc.date.updated2020-11-23T11:20:24Z
local.identifier.scopusID2-s2.0-85026359665
local.identifier.thomsonID000406015000022
CollectionsANU Research Publications

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