期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 436, 期 1, 页码 19-33出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt1399
关键词
galaxies: clusters: individual: Coma; galaxies: elliptical and lenticular, cD; galaxies: evolution; galaxies: formation; galaxies: kinematics and dynamics
资金
- Science and Technology Facilities Council [STFC] [ST/H002456/1]
- Physics Department, University of Oxford
- Australian Research Council [DP110103509]
- Marie Curie Excellence Grant from the European Commission [MEXT-CT-2003-002792]
- University of Oxford Physics Department
- John Fell OUP Research Fund
- Caltech Optical Observatories
- Alfred P. Sloan Foundation
- National Science Foundation
- US Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- American Museum of Natural History
- Astrophysical Institute Potsdam
- University of Basel
- University of Cambridge
- Case Western Reserve University
- University of Chicago
- Drexel University
- FermilabInstitute for Advanced Study
- Johns Hopkins University
- Joint Institute for Nuclear Astrophysics
- Kavli Institute for Particle Astrophysics and Cosmology
- Korean Scientist Group, the Chinese Academy of Sciences (LAMOST)
- Los Alamos National Laboratory
- Max-Planck-Institute for Astronomy (MPIA)
- Max-Planck-Institute for Astrophysics (MPA)
- New Mexico State University
- Ohio State University
- University of Pittsburgh
- University of Portsmouth
- Princeton University
- United States Naval Observatory
- University of Washington
- National Aeronautics and Space Administration's Earth Science Technology Office, Computational Technologies Project [NCC5-626]
- STFC [ST/G004331/1, ST/I003673/1, ST/K00106X/1, ST/K005596/1, ST/J002216/1, ST/H002456/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K00106X/1, ST/I003673/1, ST/H002456/1, ST/K005596/1, ST/G004331/1] Funding Source: researchfish
We present integral field spectroscopy of 27 galaxies in the Coma cluster observed with the Oxford Short Wavelength Integral Field specTrograph (SWIFT), exploring the kinematic morphology-density relationship in a cluster environment richer and denser than any in the ATLAS(3D) survey. Our new data enables comparison of the kinematic morphology relation in three very different clusters (Virgo, Coma and Abell 1689) as well as to the field/group environment. The Coma sample was selected to match the parent luminosity and ellipticity distributions of the early-type population within a radius 15 arcmin (0.43 Mpc) of the cluster centre, and is limited to r' = 16 mag (equivalent to M-K = -21.5 mag), sampling one third of that population. From analysis of the lambda-epsilon diagram, we find 15 +/- 6 per cent of early-type galaxies are slow rotators; this is identical to the fraction found in the field and the average fraction in the Virgo cluster, based on the ATLAS(3D) data. It is also identical to the average fraction found recently in Abell 1689 by D'Eugenio et al. Thus, it appears that the average slow rotator fraction of early-type galaxies remains remarkably constant across many different environments, spanning five orders of magnitude in galaxy number density. However, within each cluster the slow rotators are generally found in regions of higher projected density, possibly as a result of mass segregation by dynamical friction. These results provide firm constraints on the mechanisms that produce early-type galaxies: they must maintain a fixed ratio between the number of fast rotators and slow rotators while also allowing the total early-type fraction to increase in clusters relative to the field. A complete survey of Coma, sampling hundreds rather than tens of galaxies, could probe a more representative volume and provide significantly stronger constraints, particularly on how the slow rotator fraction varies at larger radii.
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