A Technique for Weak Lensing with Velocity Maps: Eliminating Ellipticity Noise in HI Radio Observations

Details A Technique for Weak Lensing with Velocity Maps: Eliminating Ellipticity Noise in HI Radio Observations A Technique for Weak Lensing with Velocity Maps: Eliminating Ellipticity Noise in HI Radio Observations

2006-08-23

arxiv.org/abs/astro-ph/0608494v2

Astrophys.J.650:L21-L24,2006

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJL, 4 pages, 1 figure

Scientific paper

10.1086/508614

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 HI radio surveys.

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