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arXiv 1710.03075astro-ph.COastro-ph.GA
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利用强引力透镜计算星系的内质量功率谱:超越线性近似

The inner mass power spectrum of galaxies using strong gravitational lensing: beyond linear approximation

Saikat Chatterjee, Léon V. E. Koopmans

摘要:

在过去的十年中,单个大质量暗物质子晕的探测已经有可能使用强引力透镜成像中的势校正形式。在这里,我们提出了一个统计形式主义强引力透镜表面亮度异常的透镜星系中的暗物质分布所产生的透镜电位波动。我们认为这些波动作为一个高斯随机场除了未扰动的光滑透镜模型。这是非常相似的弱透镜形式主义,我们表明,以这种方式,我们可以测量这些扰动的潜力的功率谱。我们测试的方法,将其应用到模拟不同的几何形状的镜头,并通过执行MCMC分析的理论功率谱。这种方法可以测量早期类型星系的密度波动在1-10千秒差距的尺度上,在典型的均方根水平的百分之一,使用一个单一的镜头系统观察与典型的信噪比在一个单一的轨道上获得的哈勃空间望远镜。

英文摘要:

In the last decade the detection of individual massive dark matter sub-halos has been possible using potential correction formalism in strong gravitational lens imaging. Here we propose a statistical formalism to relate strong gravitational lens surface brightness anomalies to the lens potential fluctuations arising from dark matter distribution in the lens galaxy. We consider these fluctuations as a Gaussian random field in addition to the unperturbed smooth lens model. This is very similar to weak lensing formalism and we show that in this way we can measure the power spectrum of these perturbations to the potential. We test the method by applying it to simulated mock lenses of different geometries and by performing an MCMC analysis of the theoretical power spectra. This method can measure density fluctuations in early type galaxies on scales of 1-10 kpc at typical rms-levels of a percent, using a single lens system observed with the Hubble Space Telescope with typical signal-to-noise ratios obtained in a single orbit.

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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