Skip to main content

Research Repository

Advanced Search

The KMOS Cluster Survey (KCS). I. The Fundamental Plane and the Formation Ages of Cluster Galaxies at Redshift 1.4 < Z < 1.6

Beifiori, Alessandra; Mendel, J. Trevor; Chan, Jeffrey C.C.; Saglia, Roberto P.; Bender, Ralf; Cappellari, Michele; Davies, Roger L.; Galametz, Audrey; Houghton, Ryan C.W.; Prichard, Laura J.; Smith, Russell; Stott, John P.; Wilman, David J.; Lewis, Ian J.; Sharples, Ray; Wegner, Michael

The KMOS Cluster Survey (KCS). I. The Fundamental Plane and the Formation Ages of Cluster Galaxies at Redshift 1.4 < Z < 1.6 Thumbnail


Authors

Alessandra Beifiori

J. Trevor Mendel

Jeffrey C.C. Chan

Roberto P. Saglia

Ralf Bender

Michele Cappellari

Roger L. Davies

Audrey Galametz

Ryan C.W. Houghton

Laura J. Prichard

John P. Stott

David J. Wilman

Ian J. Lewis

Michael Wegner



Abstract

We present the analysis of the fundamental plane (FP) for a sample of 19 massive red-sequence galaxies (${M}_{\star }\gt 4\times {10}^{10}$ ${M}_{\odot }$) in three known overdensities at $1.39\lt z\lt 1.61$ from the K-band Multi-object Spectrograph (KMOS) Cluster Survey, a guaranteed-time program with spectroscopy from the KMOS at the VLT and imaging from the Hubble Space Telescope. As expected, we find that the FP zero-point in B band evolves with redshift, from the value 0.443 of Coma to −0.10 ± 0.09, −0.19 ± 0.05, and −0.29 ± 0.12 for our clusters at z = 1.39, z = 1.46, and z = 1.61, respectively. For the most massive galaxies ($\mathrm{log}{M}_{\star }/{M}_{\odot }\gt 11$) in our sample, we translate the FP zero-point evolution into a mass-to-light-ratio M/L evolution, finding ${\rm{\Delta }}\mathrm{log}M/{L}_{B}=(-0.46\pm 0.10)z$, ${\rm{\Delta }}\mathrm{log}M/{L}_{B}=(-0.52\pm 0.07)z$, to ${\rm{\Delta }}\mathrm{log}M/{L}_{B}=(-0.55\pm 0.10)z$, respectively. We assess the potential contribution of the galaxy structural and stellar velocity dispersion evolution to the evolution of the FP zero-point and find it to be ~6%–35% of the FP zero-point evolution. The rate of M/L evolution is consistent with galaxies evolving passively. Using single stellar population models, we find an average age of ${2.33}_{-0.51}^{+0.86}$ Gyr for the $\mathrm{log}{M}_{\star }/{M}_{\odot }\gt 11$ galaxies in our massive and virialized cluster at z = 1.39, ${1.59}_{-0.62}^{+1.40}$ Gyr in a massive but not virialized cluster at z = 1.46, and ${1.20}_{-0.47}^{+1.03}$ Gyr in a protocluster at z = 1.61. After accounting for the difference in the age of the universe between redshifts, the ages of the galaxies in the three overdensities are consistent within the errors, with possibly a weak suggestion that galaxies in the most evolved structure are older.

Citation

Beifiori, A., Mendel, J. T., Chan, J. C., Saglia, R. P., Bender, R., Cappellari, M., …Wegner, M. (2017). The KMOS Cluster Survey (KCS). I. The Fundamental Plane and the Formation Ages of Cluster Galaxies at Redshift 1.4 < Z < 1.6. Astrophysical Journal, 846(2), Article 120. https://doi.org/10.3847/1538-4357/aa8368

Journal Article Type Article
Acceptance Date Jul 30, 2017
Online Publication Date Sep 8, 2017
Publication Date Sep 8, 2017
Deposit Date Oct 10, 2017
Publicly Available Date Oct 10, 2017
Journal Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 846
Issue 2
Article Number 120
DOI https://doi.org/10.3847/1538-4357/aa8368

Files

Published Journal Article (2.5 Mb)
PDF

Copyright Statement
© 2017. The American Astronomical Society. All rights reserved







You might also like



Downloadable Citations