UZH-Logo

Maintenance Infos

The biasing of baryons on the cluster mass function and cosmological parameter estimation


Martizzi, D; Mohammed, I; Teyssier, R; Moore, B (2014). The biasing of baryons on the cluster mass function and cosmological parameter estimation. Monthly Notices of the Royal Astronomical Society, 440(3):2290-2299.

Abstract

We study the effect of baryonic processes on the halo mass function in the galaxy cluster mass range using a catalogue of 153 high-resolution cosmological hydrodynamical simulations performed with the AMR code RAMSES. We use the results of our simulations within a simple analytical model to gauge the effects of baryon physics on the halo mass function. Neglect of AGN feedback leads to a significant boost in the cluster mass function similar to that reported by other authors. However, including AGN feedback not only gives rise to systems that are similar to observed galaxy clusters, but they also reverse the global baryonic effects on the clusters. The resulting mass function is closer to the unmodified dark matter halo mass function but still contains a mass dependent bias at the 5-10 per cent level. These effects bias measurements of the cosmological parameters, such as σ8 and Ωm. For current cluster surveys baryonic effects are within the noise for current survey volumes, but forthcoming and planned large SZ, X-ray and multiwavelength surveys will be biased at the per cent level by these processes. The predictions for the halo mass function including baryonic effects need to be carefully studied with larger and improved simulations. However, simulations of full cosmological boxes with the resolution we achieve and including AGN feedback are still computationally challenging.

We study the effect of baryonic processes on the halo mass function in the galaxy cluster mass range using a catalogue of 153 high-resolution cosmological hydrodynamical simulations performed with the AMR code RAMSES. We use the results of our simulations within a simple analytical model to gauge the effects of baryon physics on the halo mass function. Neglect of AGN feedback leads to a significant boost in the cluster mass function similar to that reported by other authors. However, including AGN feedback not only gives rise to systems that are similar to observed galaxy clusters, but they also reverse the global baryonic effects on the clusters. The resulting mass function is closer to the unmodified dark matter halo mass function but still contains a mass dependent bias at the 5-10 per cent level. These effects bias measurements of the cosmological parameters, such as σ8 and Ωm. For current cluster surveys baryonic effects are within the noise for current survey volumes, but forthcoming and planned large SZ, X-ray and multiwavelength surveys will be biased at the per cent level by these processes. The predictions for the halo mass function including baryonic effects need to be carefully studied with larger and improved simulations. However, simulations of full cosmological boxes with the resolution we achieve and including AGN feedback are still computationally challenging.

Citations

24 citations in Web of Science®
22 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

31 downloads since deposited on 13 Aug 2014
22 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:May 2014
Deposited On:13 Aug 2014 14:59
Last Modified:05 Apr 2016 18:01
Publisher:Oxford University Press
ISSN:0035-8711
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1093/mnras/stu440
Permanent URL: https://doi.org/10.5167/uzh-98135

Download

[img]
Preview
Content: Published Version
Filetype: PDF
Size: 535kB
View at publisher

TrendTerms

TrendTerms displays relevant terms of the abstract of this publication and related documents on a map. The terms and their relations were extracted from ZORA using word statistics. Their timelines are taken from ZORA as well. The bubble size of a term is proportional to the number of documents where the term occurs. Red, orange, yellow and green colors are used for terms that occur in the current document; red indicates high interlinkedness of a term with other terms, orange, yellow and green decreasing interlinkedness. Blue is used for terms that have a relation with the terms in this document, but occur in other documents.
You can navigate and zoom the map. Mouse-hovering a term displays its timeline, clicking it yields the associated documents.

Author Collaborations