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arXiv 1711.08804astro-ph.CO
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H0LiCOW VIII。透镜类星体HE $\,$ 0435 $-$ 1223场中外部会聚的弱透镜测量

H0LiCOW VIII. A weak lensing measurement of the external convergence in the field of the lensed quasar HE$\,$0435$-$1223

O. Tihhonova, F. Courbin, D. Harvey, S. Hilbert, C. E. Rusu, C. D. Fassnacht, V. Bonvin, P. J. Marshall, G. Meylan, D. Sluse, S. H. Suyu, T. Treu, K. C. Wong

摘要:

本文对四重透镜类星体HE $\,$ 0435 $-$ 1223沿视线的外会聚进行了弱引力透镜测量。使用深r波段图像从斯巴鲁-Suprime-Cam,我们观察星系下降到3 $σ$极限星等的$\sim 26$马格斯导致源星系密度为14星系/弧分$^2$后,基于红移的削减。使用修复技术和多尺度熵滤波算法,我们发现,在接近镜头的区域具有估计的外部收敛$κ=-0.012^{+0.020}_{-0.013}$,因此是边缘欠密。我们还排除了质量大于$M_{\rm vir}=1.6\times10^{14}h^{-1}M_\odot$(68 $\%$置信限)的任何晕的存在。我们的研究结果,与以前的研究一致,这个镜头,证实了干预质量沿视线到HE $\,$ 0435 $-$ 1223不会影响显着的宇宙学结果推断,从时间延迟测量的特定对象。

英文摘要:

We present a weak gravitational lensing measurement of the external convergence along the line of sight to the quadruply lensed quasar HE$\,$0435$-$1223. Using deep r-band images from Subaru-Suprime-Cam we observe galaxies down to a 3$σ$ limiting magnitude of $\sim 26$ mags resulting in a source galaxy density of 14 galaxies / arcmin$^2$ after redshift-based cuts. Using an inpainting technique and Multi-Scale Entropy filtering algorithm, we find that the region in close proximity to the lens has an estimated external convergence of $κ=-0.012^{+0.020}_{-0.013}$ and is hence marginally under-dense. We also rule out the presence of any halo with a mass greater than $M_{\rm vir}=1.6\times10^{14}h^{-1}M_\odot$ (68$\%$ confidence limit). Our results, consistent with previous studies of this lens, confirm that the intervening mass along the line of sight to HE$\,$0435$-$1223 does not affect significantly the cosmological results inferred from the time delay measurements of that specific object.

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