Halo mass function: baryon impact, fitting formulae, and implications for cluster cosmology
We use a set of hydrodynamical 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. W...
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fthighwire:oai:open-archive.highwire.org:mnras:456/3/2361 2023-05-15T18:23:07+02:00 Halo mass function: baryon impact, fitting formulae, and implications for cluster cosmology Bocquet, Sebastian Saro, Alex Dolag, Klaus Mohr, Joseph J. 2015-12-31 09:05:45.0 text/html http://mnras.oxfordjournals.org/cgi/content/short/456/3/2361 https://doi.org/10.1093/mnras/stv2657 en eng Oxford University Press http://mnras.oxfordjournals.org/cgi/content/short/456/3/2361 http://dx.doi.org/10.1093/mnras/stv2657 Copyright (C) 2015, Oxford University Press Article TEXT 2015 fthighwire https://doi.org/10.1093/mnras/stv2657 2016-11-16T17:34:19Z We use a set of hydrodynamical 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 Magneticum simulations, which are well suited because of their accurate treatment of baryons, high resolution, and large cosmological volumes of up to (3818 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 ∼ 2 and for high masses M 200 m ≳ 1014 M ⊙ . We perform cosmological analyses of three idealized approximations to the cluster surveys by the South Pole Telescope (SPT), Planck , and eROSITA. We pursue two main questions. (1) What is the impact of baryons? – for the SPT-like and the 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 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 Planck -like sample, results obtained using our DMonly HMF are shifted by Δ(σ 8 ) ≃ Δ(σ 8 (Ω m /0.27)0.3) ≃ 0.02 with respect to results obtained using the Tinker et al. fit. This suggests that using our HMF would shift results from Planck clusters towards better agreement with cosmic-microwave-background anisotropy measurements. Finally, we discuss biases that can be introduced through inadequate HMF parametrizations that introduce false cosmological sensitivity. Text South pole HighWire Press (Stanford University) South Pole Monthly Notices of the Royal Astronomical Society 456 3 2361 2373 |
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Article Bocquet, Sebastian Saro, Alex Dolag, Klaus Mohr, Joseph J. Halo mass function: baryon impact, fitting formulae, and implications for cluster cosmology |
topic_facet |
Article |
description |
We use a set of hydrodynamical 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 Magneticum simulations, which are well suited because of their accurate treatment of baryons, high resolution, and large cosmological volumes of up to (3818 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 ∼ 2 and for high masses M 200 m ≳ 1014 M ⊙ . We perform cosmological analyses of three idealized approximations to the cluster surveys by the South Pole Telescope (SPT), Planck , and eROSITA. We pursue two main questions. (1) What is the impact of baryons? – for the SPT-like and the 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 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 Planck -like sample, results obtained using our DMonly HMF are shifted by Δ(σ 8 ) ≃ Δ(σ 8 (Ω m /0.27)0.3) ≃ 0.02 with respect to results obtained using the Tinker et al. fit. This suggests that using our HMF would shift results from Planck clusters towards better agreement with cosmic-microwave-background anisotropy measurements. Finally, we discuss biases that can be introduced through inadequate HMF parametrizations that introduce false cosmological sensitivity. |
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 |
Oxford University Press |
publishDate |
2015 |
url |
http://mnras.oxfordjournals.org/cgi/content/short/456/3/2361 https://doi.org/10.1093/mnras/stv2657 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
http://mnras.oxfordjournals.org/cgi/content/short/456/3/2361 http://dx.doi.org/10.1093/mnras/stv2657 |
op_rights |
Copyright (C) 2015, Oxford University Press |
op_doi |
https://doi.org/10.1093/mnras/stv2657 |
container_title |
Monthly Notices of the Royal Astronomical Society |
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456 |
container_issue |
3 |
container_start_page |
2361 |
op_container_end_page |
2373 |
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1766202563847258112 |