We present a mass measurement for the secondary lens along the line of sight (LoS) from 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 measured its rotation velocities and determined the mass from the gas kinematics. We compared 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 -1010 M enclosed within 3.3 kpc of the centroid of the spiral galaxy, which approaches 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.

Strong-lensing and kinematic analysis of CASSOWARY 31: Can strong lensing constrain the masses of multi-plane lenses? / H. Wang, R. Cañameras, S.H. Suyu, A. Galan, C. Grillo, G.B. Caminha, L. Christensen. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - 690:(2024), pp. A1.1-A1.9. [10.1051/0004-6361/202449910]

Strong-lensing and kinematic analysis of CASSOWARY 31: Can strong lensing constrain the masses of multi-plane lenses?

C. Grillo;
2024

Abstract

We present a mass measurement for the secondary lens along the line of sight (LoS) from 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 measured its rotation velocities and determined the mass from the gas kinematics. We compared 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 -1010 M enclosed within 3.3 kpc of the centroid of the spiral galaxy, which approaches 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.
Galaxies: high-redshift; Galaxies: spiral; Galaxy: kinematics and dynamics; Gravitational lensing: strong
Settore PHYS-05/A - Astrofisica, cosmologia e scienza dello spazio
   GRAvitational lensing in galaxy clusters next-generation proposAL
   GRAAL
   MINISTERO DELL'ISTRUZIONE E DEL MERITO
   2020SKSTHZ_001
2024
25-set-2024
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1127204
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