Weak lensing in the blue: a counter-intuitive strategy for stratospheric observations

分类： 天文学 >> 天文学 提交时间： 2023-02-19

Mohamed M. Shaaban Ajay S. Gill Jacqueline McCleary Richard J. Massey Steven J. Benton Anthony M. Brown Christopher J. Damaren Tim Eifler Aurelien A. Fraisse Spencer Everett Mathew N. Galloway Michael Henderson Bradley Holder Eric M. Huff Mathilde Jauzac William C. Jones David Lagattuta Jason Leung Lun Li Thuy Vy T. Luu Johanna M. Nagy

摘要： The statistical power of weak lensing measurements is principally driven by the number of high redshift galaxies whose shapes are resolved. Conventional wisdom and physical intuition suggest this is optimised by deep imaging at long (red or near IR) wavelengths, to avoid losing redshifted Balmer break and Lyman break galaxies. We use the synthetic Emission Line EL-COSMOS catalogue to simulate lensing observations using different filters, from various altitudes. Here were predict the number of exposures to achieve a target z > 0.3 source density, using off-the-shelf and custom filters. Ground-based observations are easily better at red wavelengths, as (more narrowly) are space-based observations. However, we find that SuperBIT, a diffraction-limited observatory operating in the stratosphere, should instead perform its lensing-quality observations at blue wavelengths.

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