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Cosmological tests using the angular size of galaxy clusters
Wei, Jun-Jie1,2; Wu, Xue-Feng1,3,4; Melia, Fulvio1,5,6
2015-02-11
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume447Issue:1Pages:479-485
AbstractWe use measurements of the galaxy-cluster angular size versus redshift to test and compare the standard model (Lambda CDM) and the R-h = ct Universe. We show that the latter fits the data with a reduced chi(2)(dof) = 0.786 for a Hubble constant H-0 = 72.6(-3.4)(+3.8) km s(-1) Mpc(-1), and H-0 is the sole parameter in this model. By comparison, the optimal flat Lambda cold dark matter (Lambda CDM) model, with two free parameters (including Omega(m) = 0.50 and H-0 = 73.9(-9.5)(+10.6) km s(-1) Mpc(-1)), fits the angular-size data with a reduced chi(2)(dof) = 0.806. On the basis of their chi(2)(dof) values alone, both models appear to account for the data very well in spite of the fact that the R-h = ct Universe expands at a constant rate, while Lambda CDM does not. However, because of the different number of free parameters in these models, selection tools, such as the Bayes Information Criterion, favour R-h = ct over Lambda CDM with a likelihood of similar to 86 per cent versus similar to 14 per cent. These results impact the question of galaxy growth at large redshifts. Previous work suggested an inconsistency with the underlying cosmological model unless elliptical and disc galaxies grew in size by a surprisingly large factor similar to 6 from z similar to 3 to 0. The fact that both Lambda CDM and R-h = ct fit the cluster-size measurements quite well casts some doubt on the suggestion that the unexpected result with individual galaxies may be due to the use of an incorrect expansion scenario, rather than astrophysical causes, such as mergers and/or selection effects.
KeywordGalaxies: Clusters: General Galaxies: Evolution Cosmological Parameters Cosmology: Theory Distance Scale Large-scale Structure Of Universe
Subject Area天文和天体物理
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1093/mnras/stu2470
WOS KeywordPROBE WMAP OBSERVATIONS ; COMPACT RADIO-SOURCES ; KULLBACKS SYMMETRIC DIVERGENCE ; DISTANCE-DUALITY RELATION ; ACTIVE GALACTIC NUCLEI ; X-RAY MEASUREMENTS ; DARK ENERGY ; REDSHIFT RELATION ; MODEL SELECTION ; IA SUPERNOVAE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000350272700037
Citation statistics
Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/14891
Collection南极天文中心
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Ctr Antarctic Astron, Nanjing 210008, Peoples R China
4.Nanjing Univ, Purple Mt Observ, Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210008, Peoples R China
5.Univ Arizona, Program Appl Math, Dept Phys, Tucson, AZ 85721 USA
6.Univ Arizona, Dept Astron, Tucson, AZ 85721 USA
Recommended Citation
GB/T 7714
Wei, Jun-Jie,Wu, Xue-Feng,Melia, Fulvio. Cosmological tests using the angular size of galaxy clusters[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,447(1):479-485.
APA Wei, Jun-Jie,Wu, Xue-Feng,&Melia, Fulvio.(2015).Cosmological tests using the angular size of galaxy clusters.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,447(1),479-485.
MLA Wei, Jun-Jie,et al."Cosmological tests using the angular size of galaxy clusters".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 447.1(2015):479-485.
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