Double dark matter vision: twice the number of compact-source lenses with narrow-line lensing and the WFC3 grism
Double dark matter vision: twice the number of compact-source lenses with narrow-line lensing and the WFC3 grism
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DOI：
10.1093/mnras/stz3588
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发表时间：
2019-08
影响因子：
4.8
通讯作者：
A. Nierenberg;D. Gilman;T. Treu;G. Brammer;S. Birrer;L. Moustakas;A. Agnello;T. Anguita;T. A
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文献类型：
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作者：
A. Nierenberg;D. Gilman;T. Treu;G. Brammer;S. Birrer;L. Moustakas;A. Agnello;T. Anguita;T. A
紧凑型光源透镜的放大倍率对于从光源到观察者的整个视线中存在的低质量暗物质晕极为敏感。传统上，对紧源强引力透镜中暗物质结构的研究仅限于无线电大声系统，因为无线电发射被扩展，因此不受可以模拟暗物质结构信号的微透镜的影响。另一种方法是测量类星体核窄线发射，这种方法不受微透镜的影响，几乎存在于所有类星体透镜中。在本文中，我们通过提供八个四重成像类星体透镜系统（WGD J0405−3308、HS 0810+2554、RX J0911+0551、SDSS J1330+1810、PS J1606−2333、WFI）样本的窄线发射测量，将可用于引力透镜分析的系统数量增加了一倍。 2026−4536、WFI 2033−4723 和 WGD J2038−4008。我们描述了更新的棱镜光谱建模管道，我们用它来测量不确定性为 2% 至 10% 的窄线通量，如下所示。我们用平滑质量模型拟合透镜图像位置，并证明这些模型无法在整个透镜样本上产生观察到的图像通量分布。此外，典型的偏差大于宏观模型不确定性所预期的偏差。这种差异表明存在由小尺度暗物质结构引起的扰动。在另一篇论文中，我们用暗物质模型解释了这一结果。
The magnifications of compact-source lenses are extremely sensitive to the presence of low-mass dark matter haloes along the entire sightline from the source to the observer. Traditionally, the study of dark matter structure in compact-source strong gravitational lenses has been limited to radio-loud systems, as the radio emission is extended and thus unaffected by microlensing which can mimic the signal of dark matter structure. An alternate approach is to measure quasar nuclear-narrow-line emission, which is free from microlensing and present in virtually all quasar lenses. In this paper, we double the number of systems which can be used for gravitational lensing analyses by presenting measurements of narrow-line emission from a sample of eight quadruply imaged quasar lens systems, WGD J0405−3308, HS 0810+2554, RX J0911+0551, SDSS J1330+1810, PS J1606−2333, WFI 2026−4536, WFI 2033−4723, and WGD J2038−4008. We describe our updated grism spectral modelling pipeline, which we use to measure narrow-line fluxes with uncertainties of 2–10 per cent, presented here. We fit the lensed image positions with smooth mass models and demonstrate that these models fail to produce the observed distribution of image fluxes over the entire sample of lenses. Furthermore, typical deviations are larger than those expected from macromodel uncertainties. This discrepancy indicates the presence of perturbations caused by small-scale dark matter structure. The interpretation of this result in terms of dark matter models is presented in a companion paper.