NAOC Open IR  > 星系宇宙学研究部
Concordance of kinematics and lensing of elliptical galaxies with WMAP cosmology
Zhao, H; Qin, B
AbstractWe explore degeneracies in strong lensing model so to make time delay data consistent with the WMAP (Wilkinson Microwave Anisotropy Probe) cosmology. Previous models using a singular isothermal lens often yield a time delay between the observed multiple images too small than the observed value if we "hardwire" the now widely quoted post-WMAP "high" value of the Hubble constant (H-0 similar to 71 +/- 4 km s(-1) Mpc(-1)). Alternatively, the lens density profile (star plus dark matter) is required to be locally steeper than r(-2) (isothermal) profile near the Einstein radius (of the order 3 kpc) to fit the time delays; a naive extrapolation of a very steep profile to large radius would imply a lens halo with a scale length of the order only 3 kpc, too compact to be consistent with CDM. We explore more sophisticated, mathematically smooth, positive lens mass density profiles which are consistent with a large halo and the post-WMAP Ho. Thanks to the spherical monopole degeneracy, the "reshuffling" of the mass in a lens model does not affect the quality of the fit to the image positions, amplifications, and image time delays. Even better, unlike the better-known mass sheet degeneracy, the stellar mass-to-light and the Ho value are not affected either. We apply this monopole degeneracy to the quadruple imaged time-delay system PG 1115+080. Finally we discuss the implications of the time delay data on the newly proposed relativistic MOND theory.
KeywordCosmological Parameters Dark Matter Distance Scale Gravitational Lensing
Indexed BySCI
WOS IDWOS:000237087700002
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Univ St Andrews, SUPA, St Andrews KY16 9SS, Fife, Scotland
3.Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
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GB/T 7714
Zhao, H,Qin, B. Concordance of kinematics and lensing of elliptical galaxies with WMAP cosmology[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2006,6(2):141-154.
APA Zhao, H,&Qin, B.(2006).Concordance of kinematics and lensing of elliptical galaxies with WMAP cosmology.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,6(2),141-154.
MLA Zhao, H,et al."Concordance of kinematics and lensing of elliptical galaxies with WMAP cosmology".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 6.2(2006):141-154.
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