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题名: Cosmological tests using the angular size of galaxy clusters
作者: Wei, Jun-Jie1, 2; Wu XueFeng(吴雪峰)1, 3, 4; Melia, Fulvio1, 5, 6
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2015-02-11
卷号: 447, 期号:1, 页码:479-485
关键词: galaxies: clusters: general ; galaxies: evolution ; cosmological parameters ; cosmology: theory ; distance scale ; large-scale structure of Universe
学科分类: 天文和天体物理
DOI: 10.1093/mnras/stu2470
文章类型: Article
英文摘要: We 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.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: PROBE 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
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000350272700037
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14891
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.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
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