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题名: THE AGE-REDSHIFT RELATIONSHIP OF OLD PASSIVE GALAXIES
作者: Wei, Jun-Jie1, 2; Wu XueFeng(吴雪峰)1, 3, 4; Melia, Fulvio1, 5, 6; Wang, Fa-Yin7, 8; Yu, Hai7, 8
刊名: ASTRONOMICAL JOURNAL
出版日期: 2015-07-01
卷号: 150, 期号:1, 页码:35
关键词: cosmology: observations ; cosmology: theory ; early universe ; Galaxy: general
学科分类: 天文和天体物理
DOI: 10.1088/0004-6256/150/1/35
文章类型: Article
英文摘要: We 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.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: EQUATION-OF-STATE ; PROBE WMAP OBSERVATIONS ; OBSERVATIONS COSMOLOGICAL INTERPRETATION ; FIELD ELLIPTIC GALAXIES ; DEEP DEEP SURVEY ; DARK ENERGY ; CT UNIVERSE ; R-H ; INTERMEDIATE REDSHIFT ; MODEL SELECTION
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000357744400035
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14881
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, 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
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文件名: 2015043.pdf
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文件名: 2015044.pdf
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文件名: 历算和天文参考系研究团组CSpace批量导入模板_期刊论文_20150609.xls
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