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  Stellar property statistics of massive haloes from cosmological hydrodynamics simulations: common kernel shapes

Anbajagane, D., Evrard, A. E., Farahi, A., Barnes, D. J., Dolag, K., McCarthy, I. G., et al. (2020). Stellar property statistics of massive haloes from cosmological hydrodynamics simulations: common kernel shapes. Monthly Notices of the Royal Astronomical Society, 495(1), 686-704. doi:10.1093/mnras/staa1147.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-C0D2-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-C0D3-2
Genre: Journal Article

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 Creators:
Anbajagane, Dhayaa, Author
Evrard, August E., Author
Farahi, Arya, Author
Barnes, David J., Author
Dolag, Klaus1, Author              
McCarthy, Ian G., Author
Nelson, Dylan2, Author              
Pillepich, Annalisa, Author
Affiliations:
1Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              
2Galaxy Formation, MPI for Astrophysics, Max Planck Society, ou_2205643              

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 Abstract: We study stellar property statistics, including satellite galaxy occupation, of haloes in three cosmological hydrodynamics simulations: BAHAMAS + MACSIS, IllustrisTNG, and Magneticum Pathfinder. Applying localized linear regression, we extract halo mass-conditioned normalizations, slopes, and intrinsic covariance for (i) Nsat, the number of stellar mass-thresholded satellite galaxies within radius R200c of the halo; (ii) M⋆,tot⁠, the total stellar mass within that radius, and (iii) M⋆,BCG⁠, the gravitationally bound stellar mass of the central galaxy within a 100kpc radius. The parameters show differences across the simulations, in part from numerical resolution, but there is qualitative agreement for the Nsat−M⋆,BCG correlation. Marginalizing over Mhalo, we find the Nsat kernel, p(lnNsat|Mhalo ,z) to be consistently skewed left in all three simulations, with skewness parameter γ = −0.91 ± 0.02, while the M⋆,tot kernel shape is closer to lognormal. The highest resolution simulations find γ ≃ −0.8 for the z = 0 shape of the M⋆,BCG kernel. We provide a Gaussian mixture fit to the low-redshift Nsat kernel as well as local linear regression parameters tabulated for Mhalo >1013.5M in all simulations.

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 Dates: 2020-04-28
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/staa1147
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 495 (1) Sequence Number: - Start / End Page: 686 - 704 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150