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Mass Distribution in Galaxy Cluster Cores

  • Authors: M. T. Hogan, B. R. McNamara, F. Pulido, P. E. J. Nulsen, H. R. Russell, A. N. Vantyghem, A. C. Edge, and R. A. Main

2017 The Astrophysical Journal 837 51.

  • Provider: AAS Journals

Caption: Figure 8.

Radial run of acceleration (left) and free-fall time (right) corresponding to the mass profiles derived in Section 5. Shown as dotted lines are the equivalent parameters when the additional isothermal mass component associated with the BCG is neglected. The acceleration felt by cold gas clumps in cluster centers, as seen by ALMA, is highly dependent upon their distance from the central galaxy, with implications for the mechanisms required to retard the velocities of these clouds within the stimulated feedback model. Note also that the discrepancy of a factor of 2–5 in free-fall time when the isothermal component is neglected is similarly dependent upon radial distance from the assigned center, highlighting the importance of the choice of cluster center in the ultimate measurement of (tcool/tff)min.

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