The effect of active galactic nuclei feedback on the halo mass function

Weiguang Cui, S. Borgani, G. Murante

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Abstract

We investigate baryon effects on the halo mass function (HMF), with emphasis on the role played by active galactic nuclei (AGN) feedback. Haloes are identified with both friends-offriends (FoF) and spherical overdensity (SO) algorithms.We embed the standard SO algorithm into a memory-controlled frame program and present the Python spherIcAl Overdensity code-PIAO (Chinese character: ). For both FoF and SO haloes, the effect of AGN feedback is that of suppressing the HMFs to a level even below that of dark matter (DM) simulations. The ratio between the HMFs in the AGN and in the DM simulations is ∼0.8 at overdensity Δc = 500, a difference that increases at higher overdensity Δc = 2500, with no significant redshift and mass dependence. A decrease of the halo masses ratio with respect to the DM case induces the decrease of the HMF in the AGN simulation. The shallower inner density profiles of haloes in the AGN simulation witnesses that mass reduction is induced by the sudden displacement of gas induced by thermal AGN feedback. We provide fitting functions to describe halo mass variations at different overdensities, which can recover the HMFs with a residual random scatter ≲5 per cent for halo masses larger than 1013 h-1M⊙. © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Original languageEnglish
Pages (from-to)1769-1782
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume441
Issue number2
Early online date12 May 2014
DOIs
Publication statusPublished - 21 Jun 2014

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active galactic nuclei
halos
dark matter
simulation
effect
mass ratios
baryons
gas
profiles
gases

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Cui, Weiguang ; Borgani, S. ; Murante, G. / The effect of active galactic nuclei feedback on the halo mass function. In: Monthly Notices of the Royal Astronomical Society. 2014 ; Vol. 441, No. 2. pp. 1769-1782.
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The effect of active galactic nuclei feedback on the halo mass function. / Cui, Weiguang; Borgani, S.; Murante, G.

In: Monthly Notices of the Royal Astronomical Society, Vol. 441, No. 2, 21.06.2014, p. 1769-1782.

Research output: Contribution to journalArticle

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