A Detailed Study of the Most Relaxed SPT-selected Galaxy Clusters: Properties of the Cool Core and Central Galaxy

McDonald, M.; Allen, S. W.; Hlavacek-Larrondo, J.; Mantz, A. B.; Bayliss, M.; Benson, B. A.; Brodwin, M.; Bulbul, E.; Canning, R. E. A.; Chiu, I; Forman, W. R.; Garmire, G. P.; Gupta, N.; Khullar, G.; Mohr, J. J.; Reichardt, C. L. und Schrabback, T. (2019): A Detailed Study of the Most Relaxed SPT-selected Galaxy Clusters: Properties of the Cool Core and Central Galaxy. In: Astrophysical Journal, Bd. 870, Nr. 2, 85

Abstract

We present a multi-wavelength analysis of the four most relaxed clusters in the South Pole Telescope 2500 deg(2) survey, which lie at 0.55 < z < 0.75. This study, which utilizes new, deep data from the Chandra X-ray Observatory and Hubble Space Telescope, along with ground-based spectroscopy from Gemini and Magellan, improves significantly on previous studies in both depth and angular resolution, allowing us to directly compare to clusters at z similar to 0. We find that the temperature, density, and entropy profiles of the intracluster medium (ICM) are very similar among the four clusters, and share similar shapes to those of clusters at z similar to 0. Specifically, we find no evidence for deviations from self-similarity in the temperature profile over the radial range 10 kpc < r < 1 Mpc, implying that the processes responsible for preventing runaway cooling over the past greater than or similar to 6 Gyr are, at least roughly, preserving self-similarity. We find typical metallicities of similar to 0.3 Z(circle dot) in the bulk of the ICM, rising to similar to 0.5 Z(circle dot) in the inner similar to 100 kpc, and reaching similar to 1 Z(circle dot) at r < 10 kpc. This central excess is similar in magnitude to what is observed in the most relaxed clusters at z similar to 0, suggesting that both the global metallicity and the central excess that we see in cool core clusters at z similar to 0 were in place very early in the cluster's lifetime, and specifically that the central excess is not due to late-time enrichment by the central galaxy. Consistent with observations at z similar to 0, we measure a diversity of stellar populations in the central brightest cluster galaxies of these four clusters, with star formation rates spanning a factor of similar to 500, despite the similarities in cooling time, cooling rate, and central entropy. These data suggest that, while the details vary dramatically from system to system, runaway cooling has been broadly regulated in relaxed clusters over the past 6 Gyr.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0004-637X
• Sprache: Englisch