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Heating of the ICM and cluster scaling relations
Author(s) -
Lowenstein M.
Publication year - 1999
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/1521-3994(199908)320:4/5<193::aid-asna193>3.0.co;2-o
Subject(s) - intracluster medium , polytropic process , physics , cluster (spacecraft) , hydrostatic equilibrium , astrophysics , scaling , galaxy cluster , astronomy , geometry , mathematics , galaxy , computer science , programming language
Hydrostatic polytropic models of the intracluster medium (ICM) are presented that simultaneously explain several observed departures from predictions of basic hierarchical clustering by adding an excess heat of 3.5 keV per particle at the cluster center. This conforms with nucleosynthetic constraints derived from ICM Si measurements, if the energy injection is centrally concentrated. I argue that most of the heating occurred during the assembly of the cluster, not exclusively in pre‐collapse, proto‐cluster fragments.