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

Sarah Brough, Jesse van de Sande, Matt S. Owers, Francesco d'Eugenio, Rob Sharp, Luca Cortese, Nicholas Scott, Scott M. Croom, Rob Bassett, Kenji Bekki, Joss Bland-Hawthorn, Julia J. Bryant, Roger Davies, Michael J. Drinkwater, Simon P. Driver, Caroline Foster, Gregory Goldstein, A. R. Lopez-Sanchez, Anne M. Medling, Sarah M. Sweet & 6 others Dan S. Taranu, Chiara Tonini, Sukyoung K. Yi, Michael Goodwin, J. S. Lawrence, Samuel N. Richards

Research output: Contribution to journalArticle

20 Citations (Scopus)

### Abstract

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.
Original language English 59 1-12 12 The Astrophysical Journal: an international review of astronomy and astronomical physics 844 1 https://doi.org/10.3847/1538-4357/aa7a11 Published - 20 Jul 2017

### Cite this

Brough, Sarah ; van de Sande, Jesse ; Owers, Matt S. ; d'Eugenio, Francesco ; Sharp, Rob ; Cortese, Luca ; Scott, Nicholas ; Croom, Scott M. ; Bassett, Rob ; Bekki, Kenji ; Bland-Hawthorn, Joss ; Bryant, Julia J. ; Davies, Roger ; Drinkwater, Michael J. ; Driver, Simon P. ; Foster, Caroline ; Goldstein, Gregory ; Lopez-Sanchez, A. R. ; Medling, Anne M. ; Sweet, Sarah M. ; Taranu, Dan S. ; Tonini, Chiara ; Yi, Sukyoung K. ; Goodwin, Michael ; Lawrence, J. S. ; Richards, Samuel N. / The SAMI Galaxy Survey : Mass as the Driver of the Kinematic Morphology-Density Relation in Clusters. In: The Astrophysical Journal: an international review of astronomy and astronomical physics. 2017 ; Vol. 844, No. 1. pp. 1-12.
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title = "The SAMI Galaxy Survey: Mass as the Driver of the Kinematic Morphology-Density Relation in Clusters",
abstract = "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.",
keywords = "galaxies: clusters: general, galaxies: elliptical and lenticular, cD, galaxies: evolution, galaxies: groups: general, galaxies: kinematics and dynamics, INTEGRAL FIELD SPECTROSCOPY, MULTI-GAUSSIAN EXPANSION, ANGULAR-MOMENTUM, STELLAR KINEMATICS, ASSEMBLY GAMA, ATLAS(3D) PROJECT, SAURON PROJECT, SLOW ROTATORS, DENSEST ENVIRONMENTS, DATA RELEASE",
author = "Sarah Brough and {van de Sande}, Jesse and Owers, {Matt S.} and Francesco d'Eugenio and Rob Sharp and Luca Cortese and Nicholas Scott and Croom, {Scott M.} and Rob Bassett and Kenji Bekki and Joss Bland-Hawthorn and Bryant, {Julia J.} and Roger Davies and Drinkwater, {Michael J.} and Driver, {Simon P.} and Caroline Foster and Gregory Goldstein and Lopez-Sanchez, {A. R.} and Medling, {Anne M.} and Sweet, {Sarah M.} and Taranu, {Dan S.} and Chiara Tonini and Yi, {Sukyoung K.} and Michael Goodwin and Lawrence, {J. S.} and Richards, {Samuel N.}",
year = "2017",
month = "7",
day = "20",
doi = "10.3847/1538-4357/aa7a11",
language = "English",
volume = "844",
pages = "1--12",
journal = "The Astrophysical Journal",
issn = "0004-637X",
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Brough, S, van de Sande, J, Owers, MS, d'Eugenio, F, Sharp, R, Cortese, L, Scott, N, Croom, SM, Bassett, R, Bekki, K, Bland-Hawthorn, J, Bryant, JJ, Davies, R, Drinkwater, MJ, Driver, SP, Foster, C, Goldstein, G, Lopez-Sanchez, AR, Medling, AM, Sweet, SM, Taranu, DS, Tonini, C, Yi, SK, Goodwin, M, Lawrence, JS & Richards, SN 2017, 'The SAMI Galaxy Survey: Mass as the Driver of the Kinematic Morphology-Density Relation in Clusters' The Astrophysical Journal: an international review of astronomy and astronomical physics, vol. 844, no. 1, 59, pp. 1-12. https://doi.org/10.3847/1538-4357/aa7a11

The SAMI Galaxy Survey : Mass as the Driver of the Kinematic Morphology-Density Relation in Clusters. / Brough, Sarah; van de Sande, Jesse; Owers, Matt S.; d'Eugenio, Francesco; Sharp, Rob; Cortese, Luca; Scott, Nicholas; Croom, Scott M.; Bassett, Rob; Bekki, Kenji; Bland-Hawthorn, Joss; Bryant, Julia J.; Davies, Roger; Drinkwater, Michael J.; Driver, Simon P.; Foster, Caroline; Goldstein, Gregory; Lopez-Sanchez, A. R.; Medling, Anne M.; Sweet, Sarah M.; Taranu, Dan S.; Tonini, Chiara; Yi, Sukyoung K.; Goodwin, Michael; Lawrence, J. S.; Richards, Samuel N.

In: The Astrophysical Journal: an international review of astronomy and astronomical physics, Vol. 844, No. 1, 59, 20.07.2017, p. 1-12.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The SAMI Galaxy Survey

T2 - Mass as the Driver of the Kinematic Morphology-Density Relation in Clusters

AU - Brough, Sarah

AU - van de Sande, Jesse

AU - Owers, Matt S.

AU - d'Eugenio, Francesco

AU - Sharp, Rob

AU - Cortese, Luca

AU - Scott, Nicholas

AU - Croom, Scott M.

AU - Bassett, Rob

AU - Bekki, Kenji

AU - Bland-Hawthorn, Joss

AU - Bryant, Julia J.

AU - Davies, Roger

AU - Drinkwater, Michael J.

AU - Driver, Simon P.

AU - Foster, Caroline

AU - Goldstein, Gregory

AU - Lopez-Sanchez, A. R.

AU - Medling, Anne M.

AU - Sweet, Sarah M.

AU - Taranu, Dan S.

AU - Tonini, Chiara

AU - Yi, Sukyoung K.

AU - Goodwin, Michael

AU - Lawrence, J. S.

AU - Richards, Samuel N.

PY - 2017/7/20

Y1 - 2017/7/20

N2 - 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.

AB - 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.

KW - galaxies: clusters: general

KW - galaxies: elliptical and lenticular, cD

KW - galaxies: evolution

KW - galaxies: groups: general

KW - galaxies: kinematics and dynamics

KW - INTEGRAL FIELD SPECTROSCOPY

KW - MULTI-GAUSSIAN EXPANSION

KW - ANGULAR-MOMENTUM

KW - STELLAR KINEMATICS

KW - ASSEMBLY GAMA

KW - ATLAS(3D) PROJECT

KW - SAURON PROJECT

KW - SLOW ROTATORS

KW - DENSEST ENVIRONMENTS

KW - DATA RELEASE

U2 - 10.3847/1538-4357/aa7a11

DO - 10.3847/1538-4357/aa7a11

M3 - Article

VL - 844

SP - 1

EP - 12

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 59

ER -