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arXiv 1107.5932astro-ph.CO
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用哈勃空间望远镜研究引力透镜的色度

A Study of Gravitational Lens Chromaticity with the Hubble Space Telescope

José A. Muñoz, Evencio Mediavilla, Christopher S. Kochanek, Emilio Falco, Ana María Mosquera

摘要:

本文报道了哈勃空间望远镜用先进巡天照相机对6个引力透镜的观测结果。我们测量了从8140 nm到2200 nm的6个滤光片中透镜图像之间的通量比。在其中的3个系统中,即HE 0512 $-$ 3329、B1600+434和H1413+117,我们能够构建部分重叠2175日冕特征的紫外消光曲线,并表征尘埃相对于银河系和麦哲伦云的性质。在HE1104 $-$ 1804中,我们探测到了色微透镜现象,并利用它研究了类星体吸积盘的物理性质。对于一个高斯模型的磁盘$\exp(-r^2/2 r_s^2)$,缩放波长为$r_s \propto λ^p$,我们估计$r_s(\lambda3363)=4^{+4}_{-2}$($7\pm 4$)光天和$p=1.1\pm 0.6$($1.0\pm 0.6$)的对数(线性)之前$r_s$。剩下的两个系统,FBQ0951+2635和SBS1520+530,没有产生有用的估计消光或彩色微透镜。

英文摘要:

We report Hubble Space Telescope observations of 6 gravitational lenses with the Advanced Camera for Surveys. We measured the flux ratios between the lensed images in 6 filters from 8140Å to 2200Å. In 3 of the systems, HE0512$-$3329, B1600+434, and H1413+117, we were able to construct UV extinction curves partially overlapping the 2175Å feature and characterize the properties of the dust relative to the Galaxy and the Magellanic Clouds. In HE1104$-$1804 we detect chromatic microlensing and use it to study the physical properties of the quasar accretion disk. For a Gaussian model of the disk $\exp(-r^2/2 r_s^2)$, scaling with wavelength as $r_s \propto λ^p$, we estimate $r_s(\lambda3363)=4^{+4}_{-2}$ ($7\pm 4$) light-days and $p=1.1\pm 0.6$ ($1.0\pm 0.6$) for a logarithmic (linear) prior on $r_s$. The remaining two systems, FBQ0951+2635 and SBS1520+530, yielded no useful estimates of extinction or chromatic microlensing.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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