Title | An Accurate Analytic Mass Model for Lensing Galaxies |
Authors | Du, Wei Zhao, Gong-Bo Fan, Zuhui Shu, Yiping Li, Ran Mao, Shude |
Affiliation | Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China Yunnan Univ, South Western Inst Astron Res, Kunming 650500, Yunnan, Peoples R China Peking Univ, Dept Astron, Beijing 100871, Peoples R China Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England Tsinghua Univ, Dept Astron, Beijing 100084, Peoples R China |
Keywords | UNIVERSAL DENSITY PROFILE ELLIPTIC GALAXIES ACS SURVEY ILLUSTRIS PROJECT DARK MATTER EVOLUTION STELLAR FAMILY DISTRIBUTIONS |
Issue Date | 20-Mar-2020 |
Publisher | ASTROPHYSICAL JOURNAL |
Abstract | We develop an analytic mass model for lensing galaxies, based on a broken power-law density profile, which is a power-law profile with a mass deficit or surplus in the central region. Under the assumption of an elliptically symmetric surface mass distribution, the deflection angle and magnification can be evaluated analytically for this new model. We compute the theoretical prediction for various quantities, including the volume and surface mass density profiles of the galaxies, and the aperture and luminosity-weighted line-of-sight velocity dispersions, and compare them to those measured from the Illustris simulation. We find an excellent agreement between our model prediction and the simulation, which validates our modeling. The high efficiency and accuracy of our model manifests itself as a promising tool for studying properties of galaxies with strong lensing. |
URI | http://hdl.handle.net/20.500.11897/587645 |
ISSN | 0004-637X |
DOI | 10.3847/1538-4357/ab7a15 |
Indexed | SCI(E) Scopus |
Appears in Collections: | 物理学院 |