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  Revealing the galaxy–halo connection in IllustrisTNG

Bose, S., Eisenstein, D. J., Hernquist, L., Pillepich, A., Nelson, D., Marinacci, F., et al. (2019). Revealing the galaxy–halo connection in IllustrisTNG. Monthly Notices of the Royal Astronomical Society, 490(4), 5693-5711. doi:10.1093/mnras/stz2546.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-C0DA-C Version Permalink: http://hdl.handle.net/21.11116/0000-0005-C0DB-B
Genre: Journal Article

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 Creators:
Bose, Sownak, Author
Eisenstein, Daniel J., Author
Hernquist, Lars, Author
Pillepich, Annalisa, Author
Nelson, Dylan1, Author              
Marinacci, Federico, Author
Springel, Volker2, Author              
Vogelsberger, Mark, Author
Affiliations:
1Galaxy Formation, MPI for Astrophysics, Max Planck Society, ou_2205643              
2Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              

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 Abstract: We use the IllustrisTNG (TNG) simulations to explore the galaxy–halo connection as inferred from state-of-the-art cosmological, magnetohydrodynamical simulations. With the high-mass resolution and large volume achieved by combining the 100 Mpc (TNG100) and 300 Mpc (TNG300) volumes, we establish the mean occupancy of central and satellite galaxies and their dependence on the properties of the dark matter haloes hosting them. We derive best-fitting HOD parameters from TNG100 and TNG300 for target galaxy number densities of n¯g=0.032  and n¯g=0.016h3 Mpc−3, respectively, corresponding to a minimum galaxy stellar mass of M∼1.9×109 and M∼3.5×109M⁠, respectively, in hosts more massive than 1011M⁠. Consistent with previous work, we find that haloes located in dense environments, with low concentrations, later formation times, and high angular momenta are richest in their satellite population. At low mass, highly concentrated haloes and those located in overdense regions are more likely to contain a central galaxy. The degree of environmental dependence is sensitive to the definition adopted for the physical boundary of the host halo. We examine the extent to which correlations between galaxy occupancy and halo properties are independent and demonstrate that HODs predicted by halo mass and present-day concentration capture the qualitative dependence on the remaining halo properties. At fixed halo mass, concentration is a strong predictor of the stellar mass of the central galaxy, which may play a defining role in the fate of the satellite population. The radial distribution of satellite galaxies, which exhibits a universal form across a wide range of host halo mass, is described accurately by the best-fitting NFW density profile of their host haloes.

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 Dates: 2019-12-04
 Publication Status: Published online
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 Rev. Method: Peer
 Identifiers: DOI: 10.1093/mnras/stz2546
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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: 490 (4) Sequence Number: - Start / End Page: 5693 - 5711 Identifier: ISSN: 0035-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000021470