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concordanceofkinematicsandlensingofellipticalgalaxieswithwmapcosmology
Hongsheng Zhao; Bo Qin
2006
Source Publicationchinesejournalofastronomyandastrophysics
ISSN1009-9271
Volume6Issue:2Pages:141
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.
Language英语
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/39687
Collection中国科学院国家天文台
Affiliation中国科学院国家天文台
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Hongsheng Zhao,Bo Qin. concordanceofkinematicsandlensingofellipticalgalaxieswithwmapcosmology[J]. chinesejournalofastronomyandastrophysics,2006,6(2):141.
APA Hongsheng Zhao,&Bo Qin.(2006).concordanceofkinematicsandlensingofellipticalgalaxieswithwmapcosmology.chinesejournalofastronomyandastrophysics,6(2),141.
MLA Hongsheng Zhao,et al."concordanceofkinematicsandlensingofellipticalgalaxieswithwmapcosmology".chinesejournalofastronomyandastrophysics 6.2(2006):141.
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