A Technique for Weak Lensing with Velocity Maps: Eliminating Ellipticity Noise in H I Radio Observations
A Technique for Weak Lensing with Velocity Maps: Eliminating Ellipticity Noise in H I Radio Observations
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速度图弱透镜技术：消除 H I 射电观测中的椭圆度噪声
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
M. Morales
中科院分区：
文献类型：
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作者：
M. Morales
弱透镜巡天已经成为绘制质量分布和限制宇宙膨胀历史的有力工具，但连续体巡天必须对大量星系进行平均，以平均掉由于未知的椭圆性和透镜星系的方向而产生的椭圆性噪声。本文提出了一种利用速度图测量弱透镜效应的技术，避免了椭圆噪声。通过研究固有的噪声特性，我们认为这种新技术可以在即将到来的H I射电调查中与传统连续观测相媲美或超过传统连续观测的灵敏度。
Weak-lensing surveys have become a powerful tool for mapping mass distributions and constraining the expansion history of our universe, but continuum surveys must average over a large number of galaxies to average down the ellipticity noise due to the unknown ellipticity and orientation of the lensed galaxies. This Letter presents a technique for measuring weak lensing with velocity maps that avoids the ellipticity noise. By studying the inherent noise characteristics, we argue this new technique could rival or exceed the sensitivity of traditional continuum observations for upcoming H I radio surveys.