Halo mass function: Baryon impact, fitting formulae and implications for cluster cosmology
We use a set of hydrodynamical (Hydro) and dark matter only (DMonly) simulations to calibrate the halo mass function (HMF). We explore the impact of baryons, propose an improved parametrization for spherical overdensity masses and identify differences between our DMonly HMF and previously published...
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ftdatacite:10.48550/arxiv.1502.07357 2023-05-15T18:23:13+02:00 Halo mass function: Baryon impact, fitting formulae and implications for cluster cosmology Bocquet, Sebastian Saro, Alex Dolag, Klaus Mohr, Joseph J. 2015 https://dx.doi.org/10.48550/arxiv.1502.07357 https://arxiv.org/abs/1502.07357 unknown arXiv https://dx.doi.org/10.1093/mnras/stv2657 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences article-journal Article ScholarlyArticle Text 2015 ftdatacite https://doi.org/10.48550/arxiv.1502.07357 https://doi.org/10.1093/mnras/stv2657 2022-04-01T12:34:19Z We use a set of hydrodynamical (Hydro) and dark matter only (DMonly) simulations to calibrate the halo mass function (HMF). We explore the impact of baryons, propose an improved parametrization for spherical overdensity masses and identify differences between our DMonly HMF and previously published HMFs. We use the \textit{Magneticum} simulations, which are well suited because of their accurate treatment of baryons, high resolution, and large cosmological volumes of up to $(3818~\textrm{Mpc})^3$. Baryonic effects globally decrease the masses of galaxy clusters, which, at a given mass, results in a decrease of their number density. This effect vanishes at high redshift $z\sim2$ and for high masses $M_{200\textrm m}\gtrsim10^{14}M\odot$. We perform cosmological analyses of three idealized approximations to the cluster surveys by the South Pole Telescope (SPT), \textit{Planck}, and eROSITA. We pursue two main questions: (1) What is the impact of baryons? -- For the SPT-like and the \textit{Planck}-like samples, the impact of baryons on cosmological results is negligible. In the eROSITA-like case, however, neglecting the baryonic impact leads to an underestimate of $Ω_\textrm m$ by about $0.01$, which is comparable to the expected uncertainty from eROSITA. (2) How does our DMonly HMF compare with previous work? -- For the \textit{Planck}-like sample, results obtained using our DMonly HMF are shifted by $Δ(σ_8)\simeqΔ(σ_8(Ω_\textrm m/0.27)^{0.3})\simeq0.02$ with respect to results obtained using the Tinker et al. (2008) fit. This suggests that using our HMF would shift results from \textit{Planck} clusters toward better agreement with CMB anisotropy measurements. Finally, we discuss biases that can be introduced through inadequate HMF parametrizations that introduce false cosmological sensitivity. : Accepted for publication in MNRAS; 14 pages, 8 figures Text South pole DataCite Metadata Store (German National Library of Science and Technology) South Pole |
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DataCite Metadata Store (German National Library of Science and Technology) |
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Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences |
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Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences Bocquet, Sebastian Saro, Alex Dolag, Klaus Mohr, Joseph J. Halo mass function: Baryon impact, fitting formulae and implications for cluster cosmology |
topic_facet |
Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences |
description |
We use a set of hydrodynamical (Hydro) and dark matter only (DMonly) simulations to calibrate the halo mass function (HMF). We explore the impact of baryons, propose an improved parametrization for spherical overdensity masses and identify differences between our DMonly HMF and previously published HMFs. We use the \textit{Magneticum} simulations, which are well suited because of their accurate treatment of baryons, high resolution, and large cosmological volumes of up to $(3818~\textrm{Mpc})^3$. Baryonic effects globally decrease the masses of galaxy clusters, which, at a given mass, results in a decrease of their number density. This effect vanishes at high redshift $z\sim2$ and for high masses $M_{200\textrm m}\gtrsim10^{14}M\odot$. We perform cosmological analyses of three idealized approximations to the cluster surveys by the South Pole Telescope (SPT), \textit{Planck}, and eROSITA. We pursue two main questions: (1) What is the impact of baryons? -- For the SPT-like and the \textit{Planck}-like samples, the impact of baryons on cosmological results is negligible. In the eROSITA-like case, however, neglecting the baryonic impact leads to an underestimate of $Ω_\textrm m$ by about $0.01$, which is comparable to the expected uncertainty from eROSITA. (2) How does our DMonly HMF compare with previous work? -- For the \textit{Planck}-like sample, results obtained using our DMonly HMF are shifted by $Δ(σ_8)\simeqΔ(σ_8(Ω_\textrm m/0.27)^{0.3})\simeq0.02$ with respect to results obtained using the Tinker et al. (2008) fit. This suggests that using our HMF would shift results from \textit{Planck} clusters toward better agreement with CMB anisotropy measurements. Finally, we discuss biases that can be introduced through inadequate HMF parametrizations that introduce false cosmological sensitivity. : Accepted for publication in MNRAS; 14 pages, 8 figures |
format |
Text |
author |
Bocquet, Sebastian Saro, Alex Dolag, Klaus Mohr, Joseph J. |
author_facet |
Bocquet, Sebastian Saro, Alex Dolag, Klaus Mohr, Joseph J. |
author_sort |
Bocquet, Sebastian |
title |
Halo mass function: Baryon impact, fitting formulae and implications for cluster cosmology |
title_short |
Halo mass function: Baryon impact, fitting formulae and implications for cluster cosmology |
title_full |
Halo mass function: Baryon impact, fitting formulae and implications for cluster cosmology |
title_fullStr |
Halo mass function: Baryon impact, fitting formulae and implications for cluster cosmology |
title_full_unstemmed |
Halo mass function: Baryon impact, fitting formulae and implications for cluster cosmology |
title_sort |
halo mass function: baryon impact, fitting formulae and implications for cluster cosmology |
publisher |
arXiv |
publishDate |
2015 |
url |
https://dx.doi.org/10.48550/arxiv.1502.07357 https://arxiv.org/abs/1502.07357 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://dx.doi.org/10.1093/mnras/stv2657 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1502.07357 https://doi.org/10.1093/mnras/stv2657 |
_version_ |
1766202748400828416 |