TDCOSMO XXX：基于JWST-NIRSpec观测的时延透镜系统B1608+656和SDSSJ1206+4332中偏转体的空间分辨运动学
TDCOSMO XXX: Spatially resolved kinematics of the deflectors in time-delay lens systems B1608+656 and SDSSJ1206+4332 from JWST-NIRSpec observation
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中文总结 AI 辅助
利用JWST NIRSpec积分场光谱测量两个时延透镜系统偏转体的空间分辨运动学，首次获得扰动星系红移和速度弥散，为宇宙学参数测量提供数据。
中文摘要 AI 辅助
我们展示了从JWST NIRSpec积分场光谱中测量得到的两个时延透镜系统B1608+656和SDSS J1206+4332中偏转星系的空间分辨恒星运动学。B1608+656是一个由一对潮汐相互作用星系（主偏转体G1和近距离伴星系G2）透镜化的四重成像类星体，我们量化了G2对G1的潮汐影响，并定义了一个判据来识别该扰动可忽略且标准Jeans方程建模仍然有效的区域。SDSS J1206+4332是一个双重成像类星体，其延展的宿主星系本身被一个前景大质量星系（G0）四重成像，并伴有一个较暗的扰动体（G1）。对于这两个系统，我们报告了扰动星系的首次光谱红移和速度弥散测量。对于B1608+656中的G2，我们在z = 0.6307处测得{\sigma}_v = 188 +/- 7（统计） +/- 2（系统） km/s，与主偏转体G1的红移相同。对于SDSS J1206+4332中的G1，我们在z = 0.7403处测得{\sigma}_v = 100 +/- 21（统计） +/- 2（系统） km/s，略低于主偏转体G0。两个主偏转体的分辨速度图显示出清晰的旋转特征，我们将其目视分类为快速或规则旋转体。数据产品将公开提供，并将与时延、透镜模型和视线收敛相结合，用于在即将到来的TDCOSMO 2026里程碑出版物中测量宇宙学参数。
英文摘要
We present spatially resolved stellar kinematics of the deflector galaxies in two time-delay lens systems, B1608+656 and SDSS J1206+4332, measured from JWST NIRSpec integral field spectroscopy. B1608+656 is a quadruply imaged quasar lensed by a pair of tidally interacting galaxies, the primary deflector (G1) and a close companion (G2), for which we quantified G2's tidal influence on G1 and define a criterion identifying the region where this perturbation is negligible and standard Jeans-equation modeling remains valid. SDSS J1206+4332 is a doubly imaged quasar whose extended host galaxy is itself quadruply imaged by a foreground massive galaxy (G0), accompanied by a fainter perturber (G1). For both systems, we report the first spectroscopic redshift and velocity dispersion measurements of the perturber galaxies. For G2 in B1608+656, we measure σ_v = 188 +/- 7 (stat.) +/- 2 (sys.) km/s at z = 0.6307, identical to the redshift of the main deflector G1. For G1 in SDSS J1206+4332, we find σ_v = 100 +/- 21 (stat.) +/- 2 (sys.) km/s at z = 0.7403, slightly lower than the primary deflector G0. The resolved velocity maps of both primary deflectors show clear rotation signatures and we visually classify them as fast or regular rotators. The data products will be made publicly available and will be combined with time delays, lens models, and line-of-sight convergence to measure cosmological parameters in the upcoming TDCOSMO 2026 milestone publication.
发表机构
- University of California, Los Angeles（加州大学洛杉矶分校）
- University of Chicago（芝加哥大学）
- Independent University, Bangladesh（孟加拉独立大学）
- University of Oxford（牛津大学）
- Technical University of Munich（慕尼黑工业大学）
- Max Planck Institute for Astrophysics（马克斯·普朗克天体物理学研究所）
机构由 AI 辅助整理，请以论文原文为准。
