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  Dependency of halo concentration on mass, redshift and fossilness in Magneticum hydrodynamic simulations

Ragagnin, A., Dolag, K., Moscardini, L., Biviano, A., & D’Onofrio, M. (2019). Dependency of halo concentration on mass, redshift and fossilness in Magneticum hydrodynamic simulations. Monthly Notices of the Royal Astronomical Society, 486(3), 4001-4012. doi:10.1093/mnras/stz1103.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-63D0-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-63D1-0
Genre: Journal Article

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Ragagnin, Antonio, Author
Dolag, Klaus1, Author              
Moscardini, Lauro, Author
Biviano, Andrea, Author
D’Onofrio, Mauro, Author
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1Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              

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 Abstract: We study the dependency of the concentration on mass and redshift using three large N-body cosmological hydrodynamic simulations carried out by the Magneticum project. We constrain the slope of the mass-concentration relation with an unprecedented mass range for hydrodynamic simulations and find a negative trend on the mass-concentration plane and a slightly negative redshift dependency, in agreement with observations and other numerical works. We also show how the concentration correlates with the fossil parameter, defined as the stellar mass ratio between the central galaxy and the most massive satellite, in agreement with observations. We find that haloes with high fossil parameter have systematically higher concentration and investigate the cause in two different ways. First, we study the evolution of haloes that live unperturbed for a long period of time, where we find that the internal region keeps accreting satellites as the fossil parameter increases and the scale radius decreases (which increases the concentration). We also study the dependency of the concentration on the virial ratio and the energy term from the surface pressure Es. We conclude that fossil objects have higher concentration because they are dynamically relaxed, with no in-fall/out-fall material and had time to accrete their satellites.

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 Dates: 2019-04-18
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stz1103
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Title: Monthly Notices of the Royal Astronomical Society
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Source Genre: Journal
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Publ. Info: OXFORD : OXFORD UNIV PRESS
Pages: - Volume / Issue: 486 (3) Sequence Number: - Start / End Page: 4001 - 4012 Identifier: ISSN: 0035-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000021470