Strong-lensing and kinematic analysis of CASSOWARY 31: can strong lensing constrain the masses of multi-plane lenses?
arxiv(2024)
摘要
We present a mass measurement for the secondary lens along the line of sight
(LoS) in the multi-plane strong lens modeling of the group-scale lens CASSOWARY
31 (CSWA 31). The secondary lens at redshift z = 1.49 is a spiral galaxy well
aligned along the LoS with the main lens at z = 0.683. Using the MUSE
integral-field spectroscopy of this spiral galaxy, we measure its rotation
velocities and determine the mass from the gas kinematics. We compare the mass
estimation of the secondary lens from the lensing models to the mass
measurement from kinematics, finding that the predictions from strong lensing
tend to be higher. By introducing an additional lens plane at z = 1.36 for an
overdensity known to be present, we find a mass of ≃ 10^10 M_⊙
enclosed within 3.3 kpc from the centroid of the spiral galaxy, approaching the
estimate from kinematics. This shows that secondary-lens mass measurements from
multiple-plane modeling are affected by systematic uncertainties from the
degeneracies between lens planes and the complex LoS structure. Conducting a
detailed analysis of the LoS structures is therefore essential to improve the
mass measurement of the secondary lens.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要