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  Baryon-CDM isocurvature galaxy bias with IllustrisTNG

Barreira, A., Cabass, G., Nelson, D., & Schmidt, F. (2020). Baryon-CDM isocurvature galaxy bias with IllustrisTNG. Journal of Cosmology and Astroparticle Physics, 2020(2): 005. doi:10.1088/1475-7516/2020/02/005.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-A080-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-A081-2
Genre: Journal Article

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 Creators:
Barreira, Alexandre1, Author              
Cabass, Giovanni1, Author              
Nelson, Dylan2, Author              
Schmidt, Fabian3, Author              
Affiliations:
1Physical Cosmology, MPI for Astrophysics, Max Planck Society, ou_2205644              
2Galaxy Formation, MPI for Astrophysics, Max Planck Society, ou_2205643              
3High Energy Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159881              

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 Abstract: We study the impact that baryon-CDM relative density perturbations δbc have on galaxy formation using cosmological simulations with the IllustrisTNG model. These isocurvature (non-adiabatic) perturbations can be induced primordially, if multiple fields are present during inflation, and are generated before baryon-photon decoupling when baryons did not comove with CDM. The presence of long-wavelength δbc perturbations in our simulations is mimicked by modifying the ratios of the cosmic densities of baryons Ωb and CDM Ωc, at fixed total matter density Ωm. We measure the corresponding galaxy bias parameter bδbc as the response of galaxy abundances to δbc. When selecting by total host halo mass, bδbc is negative and it decreases with mass and redshift. Stellar-mass selected simulated galaxies show a weaker or even the opposite trend because of the competing effects of δbc on the halo mass function and stellar-to-halo-mass relations. We show that simple modeling of the latter two effects describes bδbc for stellar-mass-selected objects well. We find bδbc =0.6 for M* = 1011 M/h and z=0.5, which is representative of BOSS DR12 galaxies. For δbc modes generated by baryon-photon interactions, we estimate the impact on the DR12 power spectrum to be below 1%, and shifts on inferred distance and growth rate parameters should not exceed 0.1%.

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Language(s): eng - English
 Dates: 2020-02-04
 Publication Status: Published online
 Pages: -
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 Rev. Type: Peer
 Identifiers: DOI: 10.1088/1475-7516/2020/02/005
Other: LOCALID: 3240438
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Title: Journal of Cosmology and Astroparticle Physics
  Abbreviation : J. Cosmol. Astropart. Phys.
  Abbreviation : JCAP
Source Genre: Journal
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Pages: - Volume / Issue: 2020 (2) Sequence Number: 005 Start / End Page: - Identifier: ISSN: 1475-7516