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

Abstract

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.

Accepted for publication in ApJL, 4 pages, 1 figure

References in corpus (8)

• Weak Gravitational Lensing
• Report of the Dark Energy Task Force
• Weak Lensing and Cosmology
• The 1000 Brightest HIPASS Galaxies: HI Mass Function and Omega_HI
• Probing dark energy with baryonic oscillations and future radio surveys of neutral Hydrogen
• Cosmology with the Square Kilometre Array
• Cosmology with the Square Kilometre Array
• Detecting gravitational lensing cosmic shear from samples of several galaxies using two-dimensional spectral imaging

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