The SAMI pilot survey

the kinematic morphology-density relation in Abell 85, Abell 168 and Abell 2399

L. M R Fogarty*, Nicholas Scott, Matt S. Owers, S. Brough, Scott M. Croom, Michael B. Pracy, R. C W Houghton, Joss Bland-Hawthorn, Matthew Colless, Roger L. Davies, D. Heath Jones, J. T. Allen, Julia J. Bryant, Michael Goodwin, Andrew W. Green, Iraklis S. Konstantopoulos, J. S. Lawrence, Samuel Richards, Luca Cortese, Rob Sharp

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

We examine the kinematic morphology of early-type galaxies (ETGs) in three galaxy clusters Abell 85, 168 and 2399. Using data from the Sydney-AAOMulti-object Integral field spectrograph we measure spatially resolved kinematics for 79 ETGs in these clusters. We calculate λR, a proxy for the projected specific stellar angular momentum, for each galaxy and classify the 79 ETGs in our samples as fast or slow rotators. We calculate the fraction of slow rotators in the ETG populations (fSR) of the clusters to be 0.21 ± 0.08, 0.08 ± 0.08 and 0.12 ± 0.06 for Abell 85, 168 and 2399, respectively, with an overall fraction of 0.15 ± 0.04. These numbers are broadly consistent with the values found in the literature, confirming recent work asserting that the fraction of slow rotators in the ETG population is constant across many orders of magnitude in global environment. We examine the distribution of kinematic classes in each cluster as a function of environment using the projected density of galaxies: the kinematic morphology-density relation.We find that in Abell 85 fSR increases in higher density regions but in Abell 168 and 2399 this trend is not seen. We examine the differences between the individual clusters to explain this. In addition, we find slow rotators on the outskirts of two of the clusters studied, Abell 85 and 2399. These galaxies reside in intermediate to low density regions and have clearly not formed at the centre of a cluster environment. We hypothesize that they formed at the centres of groups and are falling into the clusters for the first time.

Original languageEnglish
Pages (from-to)485-503
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Volume443
Issue number1
DOIs
Publication statusPublished - 2014
Externally publishedYes

Bibliographical note

Copyright 2015 The Authors. First published in Monthly Notices of the Royal Astronomical Society, 443(1), 485-503. The original publication is available at http://doi.org/10.1093/mnras/stu1165, published by Oxford University Press on behalf of the Royal Astronomical Society. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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