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arXiv 1002.2570astro-ph.CO
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由18个延时透镜推知的哈勃常数

The Hubble constant inferred from 18 time-delay lenses

Danuta Paraficz, Jens Hjorth

摘要:

我们提出了一个同时分析的18个星系透镜的时间延迟测量。对于每个镜头,我们推导出质量地图使用像素化的同时建模与共享的哈勃常数。我们估计哈勃常数为66_{-4}^{+6} km/s/Mpc(对于一个平坦的宇宙,Ω_m=0.3,Ω_Λ=0.7)。我们还选取了五个相对孤立的早型星系作为子样本,通过对它们的质量分布附加等温约束的同时模拟,得到了H_0=76 +/-3km/s/Mpc。

英文摘要:

We present a simultaneous analysis of 18 galaxy lenses with time delay measurements. For each lens we derive mass maps using pixelated simultaneous modeling with shared Hubble constant. We estimate the Hubble constant to be 66_{-4}^{+6} km/s/Mpc (for a flat Universe with Ω_m=0.3, Ω_Λ=0.7). We have also selected a subsample of five relatively isolated early type galaxies and by simultaneous modeling with an additional constraint on isothermality of their mass profiles we get H_0=76 +/-3 km/s/Mpc.

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