X-shooter镜头调查- II。示例演示和空间解析运动学
The X-shooter Lens Survey - II. Sample presentation and spatially resolved kinematics
摘要：
我们提供了X-shooter镜头调查（XLENS）数据。XLENS的主要目标是通过结合强引力透镜、动力学和光谱恒星星族研究，解开大质量早期型星系的恒星和暗物质内容。该样本由11个透镜星系组成，覆盖了从$0.1$到$0.45$的红移范围，并且具有介于$250$和$380\,\mathrm{km}\,\mathrm{s}^{-1}$之间的恒星速度色散。所有星系都有多波段、高质量的HST成像。我们在VLT上用X射线摄影机获得了透镜星系的长缝谱。我们能够解开的黑暗和明亮的质量组件相结合的透镜和扩展的运动学数据集，我们也能够精确地约束恒星的质光比和推断的IMF的低质量截止值，通过添加光谱恒星星族的信息。我们的目标是将这些IMF参数与ETG质量相关联，并研究重子和非重子物质在质量组装和结构形成过程中的关系。在本文中，我们提供了一个概述的调查，突出其科学动机，主要目标和技术。我们目前的样本，简要描述的数据减少和分析过程中，我们提出的第一个结果空间分辨运动学。
英文摘要：
We present the X-shooter Lens Survey (XLENS) data. The main goal of XLENS is to disentangle the stellar and dark matter content of massive early-type galaxies (ETGs), through combined strong gravitational lensing, dynamics and spectroscopic stellar population studies. The sample consists of 11 lens galaxies covering the redshift range from $0.1$ to $0.45$ and having stellar velocity dispersions between $250$ and $380\,\mathrm{km}\,\mathrm{s}^{-1}$. All galaxies have multi-band, high-quality HST imaging. We have obtained long-slit spectra of the lens galaxies with X-shooter on the VLT. We are able to disentangle the dark and luminous mass components by combining lensing and extended kinematics data-sets, and we are also able to precisely constrain stellar mass-to-light ratios and infer the value of the low-mass cut-off of the IMF, by adding spectroscopic stellar population information. Our goal is to correlate these IMF parameters with ETG masses and investigate the relation between baryonic and non-baryonic matter during the mass assembly and structure formation processes. In this paper we provide an overview of the survey, highlighting its scientific motivations, main goals and techniques. We present the current sample, briefly describing the data reduction and analysis process, and we present the first results on spatially resolved kinematics.
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