Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/27531
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Corasaniti, P. S. | en_US |
dc.contributor.author | ETTORI, STEFANO | en_US |
dc.contributor.author | Rasera, Y. | en_US |
dc.contributor.author | Sereno, Mauro | en_US |
dc.contributor.author | Amodeo, S. | en_US |
dc.contributor.author | Breton, M. -A. | en_US |
dc.contributor.author | Ghirardini, V. | en_US |
dc.contributor.author | Eckert, D. | en_US |
dc.date.accessioned | 2020-09-29T13:14:15Z | - |
dc.date.available | 2020-09-29T13:14:15Z | - |
dc.date.issued | 2018 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/27531 | - |
dc.description.abstract | We present a new cosmological probe for galaxy clusters, the halo sparsity. This characterizes halos in terms of the ratio of halo masses measured at two different radii and carries cosmological information encoded in the halo mass profile. Building on the work of Balmes et al., we test the properties of the sparsity using halo catalogs from a numerical N-body simulation of (2.6 Gpc h <SUP>-1</SUP>)<SUP>3</SUP> volume with 4096<SUP>3</SUP> particles. We show that at a given redshift the average sparsity can be predicted from prior knowledge of the halo mass function. This provides a quantitative framework to infer cosmological parameter constraints using measurements of the sparsity of galaxy clusters. We show this point by performing a likelihood analysis of synthetic data sets with no systematics, from which we recover the input fiducial cosmology. We also perform a preliminary analysis of potential systematic errors and provide an estimate of the impact of baryonic effects on sparsity measurements. We evaluate the sparsity for a sample of 104 clusters with hydrostatic masses from X-ray observations and derive constraints on the cosmic matter density Ω<SUB> m </SUB> and the normalization amplitude of density fluctuations at the 8 Mpc h <SUP>-1</SUP> scale, σ <SUB>8</SUB>. Assuming no systematics, we find Ω<SUB> m </SUB> = 0.42 ± 0.17 and σ <SUB>8</SUB> = 0.80 ± 0.31 at 1σ, corresponding to {S}<SUB>8</SUB>\equiv {σ }<SUB>8</SUB>\sqrt{{{{Ω }}}<SUB>m</SUB>}=0.48+/- 0.11. Future cluster surveys may provide opportunities for precise measurements of the sparsity. A sample of a few hundred clusters with mass estimate errors at the few percent level can provide competitive cosmological parameter constraints complementary to those inferred from other cosmic probes. | en_US |
dc.language.iso | eng | en_US |
dc.title | Probing Cosmology with Dark Matter Halo Sparsity Using X-Ray Cluster Mass Measurements | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/1538-4357/aaccdf | en_US |
dc.identifier.scopus | 2-s2.0-85050767570 | en_US |
dc.identifier.isi | 000439334300007 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/1538-4357/aaccdf | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 862 | en_US |
dc.relation.issue | 1 | en_US |
dc.relation.firstpage | 40 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2018ApJ...862...40C | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_9 Clusters of galaxies and large scale structures | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.orcid | 0000-0003-4117-8617 | - |
crisitem.author.orcid | 0000-0003-0302-0325 | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
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Corasaniti_2018_ApJ_862_40.pdf | Pdf editoriale | 1.25 MB | Adobe PDF | View/Open |
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