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THE AGE-REDSHIFT RELATIONSHIP OF OLD PASSIVE GALAXIES
Wei, Jun-Jie1,2; Wu, Xue-Feng1,3,4; Melia, Fulvio1,5,6; Wang, Fa-Yin7,8; Yu, Hai7,8
2015-07-01
Source PublicationASTRONOMICAL JOURNAL
Volume150Issue:1Pages:35
AbstractWe use 32 age measurements of passively evolving galaxies as a function of redshift to test and compare the standard model (ACDM) with the R-h = Ct universe. We show that the latter fits the data with a reduced chi(2)(dof) = 0.435 for a Hubble constant H-0 = 67.2(-4.0)(+4.5) km s(-1) Mpc(-1) By comparison, the optimal flat ACDM model, A dof ith two free parameters (including Omega(m) = 0.12(-0.11)(+0.54) and H-0 = 94.3(-35.8)(+32.7) km s(-1) Mpc(-1)), fits the age-z data with a reduced chi(2)(dof) = 0.428. Based solely on their chi(2)(dof) values, both models appear to account for the data very well, though the optimized ACDM parameters are only marginally consistent with those of the concordance model (Omega(m), = 0.27 and H-0 = 70 km s(-1) Mpc(-1)). Fitting the age-z data with the latter results in a reduced chi(2)(dof) = 0.523. However, because of the different number of free parameters in these models, selection tools, such as the Akaike, Kullback and Bayes Information Criteria, favor R-h = Ct over ACDM with a likelihood of similar to 66.5%-80.5% versus similar to 19.5%-33.5%. These results are suggestive, though not yet compelling, given the current limited galaxy age-z sample. We carry out Monte Carlo simulations based on these current age measurements to estimate how large the sample would have to be in order to rule out either model at a similar to 99.7% confidence level. We find that if the real cosmology is Lambda CDM, a sample of similar to 45 galaxy ages would be sufficient to rule out R-h = Ct at this level of accuracy, while similar to 350 galaxy ages would be required to rule out ACDM if the real universe were instead R-h = Ct. This difference in required sample size reflects the greater number of free parameters available to fit the data with Lambda CDM.
KeywordCosmology: Observations Cosmology: Theory Early Universe Galaxy: General
Subject Area天文和天体物理
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-6256/150/1/35
WOS KeywordEQUATION-OF-STATE ; PROBE WMAP OBSERVATIONS ; OBSERVATIONS COSMOLOGICAL INTERPRETATION ; FIELD ELLIPTIC GALAXIES ; DEEP DEEP SURVEY ; DARK ENERGY ; CT UNIVERSE ; R-H ; INTERMEDIATE REDSHIFT ; MODEL SELECTION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000357744400035
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/14881
Collection南极天文中心
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Ctr Antarct Astron, Nanjing 210008, Jiangsu, Peoples R China
4.Nanjing Univ, Purple Mt Observ, Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210008, Jiangsu, Peoples R China
5.Univ Arizona, Dept Phys, Program Appl Math, Tucson, AZ 85721 USA
6.Univ Arizona, Dept Astron, Tucson, AZ 85721 USA
7.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
8.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Wei, Jun-Jie,Wu, Xue-Feng,Melia, Fulvio,et al. THE AGE-REDSHIFT RELATIONSHIP OF OLD PASSIVE GALAXIES[J]. ASTRONOMICAL JOURNAL,2015,150(1):35.
APA Wei, Jun-Jie,Wu, Xue-Feng,Melia, Fulvio,Wang, Fa-Yin,&Yu, Hai.(2015).THE AGE-REDSHIFT RELATIONSHIP OF OLD PASSIVE GALAXIES.ASTRONOMICAL JOURNAL,150(1),35.
MLA Wei, Jun-Jie,et al."THE AGE-REDSHIFT RELATIONSHIP OF OLD PASSIVE GALAXIES".ASTRONOMICAL JOURNAL 150.1(2015):35.
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