Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A census of cool core galaxy clusters in IllustrisTNG   The thermodynamic structure of hot gas in galaxy clusters is sensitive to
astrophysical processes and typically difficult to model with galaxy formation
simulations. We explore the fraction of cool-core (CC) clusters in a large
sample of $370$ clusters from IllustrisTNG, examining six common CC
definitions. IllustrisTNG produces continuous CC criteria distributions, the
extremes of which are classified as CC and non-cool-core (NCC), and the
criteria are increasingly correlated for more massive clusters. At $z=0$, the
CC fractions for $2$ criteria are in reasonable agreement with the observed
fractions but the other $4$ CC fractions are lower than observed. This result
is partly driven by systematic differences between the simulated and observed
gas fraction profiles. The simulated CC fractions with redshift show tentative
agreement with the observed fractions, but linear fits demonstrate that the
simulated evolution is steeper than observed. The conversion of CCs to NCCs
appears to begin later and act more rapidly in the simulations. Examining the
fraction of CCs and NCCs defined as relaxed we find no evidence that CCs are
more relaxed, suggesting that mergers are not solely responsible for disrupting
CCs. A comparison of the median thermodynamic profiles defined by different CC
criteria shows that the extent to which they evolve in the cluster core is
dependent on the CC criteria. We conclude that the thermodynamic structure of
galaxy clusters in IllustrisTNG shares many similarities with observations, but
achieving better agreement most likely requires modifications of the underlying
galaxy formation model.

22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga