THE EVOLUTION OF THE INTRACLUSTER MEDIUM METALLICITY IN SUNYAEV ZEL’DOVICH-SELECTED GALAXY CLUSTERS AT 0 < Z < 1.5
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Author(s)
Haan, T. de
Miller, E. D.
Benson, B. A.
Bleem, L. E.
Brodwin, M.
Carlstrom, J. E.
Chiu, I.
Forman, W. R.
Hlavacek-Larrondo, J.
Garmire, G. P.
Date Issued
July 2017
Journal
The Astrophysical Journal
Publisher
American Astronomical Society
Citation
McDonald, M., et al. “THE EVOLUTION OF THE INTRACLUSTER MEDIUM METALLICITY IN SUNYAEV ZEL’DOVICH-SELECTED GALAXY CLUSTERS AT 0 < z < 1.5.” The Astrophysical Journal, vol. 826, no. 2, July 2016, p. 124. © 2016. The American Astronomical Society
Version
Final published version
Abstract
We present the results of an X-ray spectral analysis of 153 galaxy clusters observed with the Chandra, XMM-Newton, and Suzaku space telescopes. These clusters, which span 0 < z < 1.5, were drawn from a larger, mass-selected sample of galaxy clusters discovered in the 2500 square degree South Pole Telescope Sunyaev Zel'dovich (SPT-SZ) survey. With a total combined exposure time of 9.1 Ms, these data yield the strongest constraints to date on the evolution of the metal content of the intracluster medium (ICM). We find no evidence for strong evolution in the global (r < R[subscript 500]) ICM metallicity (dZ/dz = -0.06 ± 0.04 Z[subscript ⊙]), with a mean value at z = 0.6 of (Z) = 0.23 ± 0.01 Z ⊙ and a scatter of σ[subscript Z] = 0.08 ± 0.01 Z[subscript ⊙]. These results imply that the emission-weighted metallicity has not changed by more than 40% since z = 1 (at 95% confidence), consistent with the picture of an early (z > 1) enrichment. We find, in agreement with previous works, a significantly higher mean value for the metallicity in the centers of cool core clusters versus non-cool core clusters. We find weak evidence for evolution in the central metallicity of cool core clusters (dZ/dz = -0.21 ± 0.11 Z ⊙), which is sufficient to account for this enhanced central metallicity over the past ∼10 Gyr. We find no evidence for metallicity evolution outside of the core (dZ/dz = -0.03 ± 0.06 Z ⊙), and no significant difference in the core-excised metallicity between cool core and non-cool core clusters. This suggests that strong radio-mode active galactic nucleus feedback does not significantly alter the distribution of metals at . Given the limitations of current-generation X-ray telescopes in constraining the ICM metallicity at z > 1, significant improvements on this work will likely require next-generation X-ray missions. Key words: galaxies: clusters: general – galaxies: clusters: intracluster medium – X-rays: galaxies: clusters
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.3847/0004-637X/826/2/124
