| Autor: |
M. McDonald, B. R. McNamara, G. M. Voit, M. Bayliss, B. A. Benson, M. Brodwin, R. E. A. Canning, M. K. Florian, G. P. Garmire, M. Gaspari, M. D. Gladders, J. Hlavacek-Larrondo, E. Kara, C. L. Reichardt, H. R. Russell, A. Saro, K. Sharon, T. Somboonpanyakul, G. R. Tremblay, R. J. van Weeren |
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| Zdroj: |
Astrophysical Journal; 11/1/2019, Vol. 885 Issue 1, p1-1, 1p |
| Abstrakt: |
We present new, deep observations of the Phoenix cluster from Chandra, the Hubble Space Telescope, and the Karl Jansky Very Large Array. These data provide an order-of-magnitude improvement in depth and/or angular resolution over previous observations at X-ray, optical, and radio wavelengths. We find that the one-dimensional temperature and entropy profiles are consistent with expectations for pure-cooling models. In particular, the entropy profile is well fit by a single power law at all radii, with no evidence for excess entropy in the core. In the inner ∼10 kpc, the cooling time is shorter than any other known cluster by an order of magnitude, while the ratio of the cooling time to freefall time (tcool/tff) approaches unity, signaling that the intracluster medium is unable to resist multiphase condensation on kpc scales. The bulk of the cooling in the inner ∼20 kpc is confined to a low-entropy filament extending northward from the central galaxy, with tcool/tff ∼ 1 over the length of the filament. In this filament, we find evidence for ∼1010M⊙ in cool (∼104 K) gas (as traced by the [O ii]λλ3726,3729 doublet), which is coincident with the low-entropy filament and absorbing soft X-rays. The bulk of this cool gas is draped around and behind a pair of X-ray cavities, presumably bubbles that have been inflated by radio jets. These data support a picture in which active galactic nucleus feedback is promoting the formation of a multiphase medium via uplift of low-entropy gas, either via ordered or chaotic (turbulent) motions. [ABSTRACT FROM AUTHOR] |
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Complementary Index |
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