附近大质量强透镜星系的透镜和恒星轨道模型的比较
Comparing Lensing and Stellar Orbital Models of a Nearby Massive Strong-Lens Galaxy
摘要：
利用附近的强透镜星系SNL-1的相对接近，我们提出了一个重要的比较来自独立的建模技术的质量估计。我们适合三轴轨道叠加动力学模型的空间分辨恒星运动学，并比较来自透镜建模的高分辨率测光的约束。从动力学模型，我们测量的总（动力学）质量包围在一个半径的爱因斯坦半径的投影孔径为$\log_{10} M_{\mathrm{Ein.}} = 11.00 \pm 0.02$，这与以前的测量从透镜建模内$5\%$。然后，我们探索的内在（去投影）最佳拟合动力学模型的属性。我们发现SNL-1在所有半径处具有近似恒定的中间三轴度。它在内部区域（在爱因斯坦半径附近）是扁球形的，在更大的半径处趋向于球形。恒星速度椭球逐渐从中心区域的各向同性转变为外围区域的径向偏置。我们发现，SNL-1是动态一致的更广泛的星系人口，测量轨道的相对分数相比，CALIFA调查的“温度”。在质量大小平面上，SNL-1占据了最紧凑的边缘，与MaNGA和SAMI调查相比。最后，我们探讨了如何观察到的透镜配置的影响的方向的透镜星系。我们讨论了这些详细的模型对未来的组合透镜和动力学分析的影响。
英文摘要：
Exploiting the relative proximity of the nearby strong-lens galaxy SNL-1, we present a critical comparison of the mass estimates derived from independent modelling techniques. We fit triaxial orbit-superposition dynamical models to spatially-resolved stellar kinematics, and compare to the constraints derived from lens modelling of high-resolution photometry. From the dynamical model, we measure the total (dynamical) mass enclosed within a projected aperture of radius the Einstein radius to be $\log_{10} M_{\mathrm{Ein.}} = 11.00 \pm 0.02$, which agrees with previous measurements from lens modelling to within $5\%$. We then explore the intrinsic (de-projected) properties of the best-fitting dynamical model. We find that SNL-1 has approximately-constant, intermediate triaxiality at all radii. It is oblate-like in the inner regions (around the Einstein radius) and tends towards spherical at larger radii. The stellar velocity ellipsoid gradually transforms from isotropic in the very central regions to radially-biased in the outskirts. We find that SNL-1 is dynamically consistent with the broader galaxy population, as measured by the relative fraction of orbit `temperatures' compared to the CALIFA survey. On the mass--size plane, SNL-1 occupies the most-compact edge given its mass, compared to both the MaNGA and SAMI surveys. Finally, we explore how the observed lensing configuration is affected by the orientation of the lens galaxy. We discuss the implications of such detailed models on future combined lensing and dynamical analyses.
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