Weak Lensing in the Blue: A Counter-intuitive Strategy for Stratospheric Observations
Weak Lensing in the Blue: A Counter-intuitive Strategy for Stratospheric Observations
复制标题
蓝色弱透镜：平流层观测的反直觉策略
DOI：
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发表时间：
2022
影响因子：
5.3
通讯作者：
S. Sivanandam
中科院分区：
文献类型：
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作者：
Mohamed M. Shaaban;A. Gill;J. McCleary;R. Massey;S. J. Benton;A. Brown;C. Damaren;T. Eifler;A. Fraisse;S. Everett;M. Galloway;Michael Henderson;B. Holder;E. Huff;M. Jauzac;W. Jones;D. Lagattuta;J. S. Leung;Lun Li;Thuy Vy T. Luu;J. Nagy;C. B. Netterfield;S. Redmond;J. Rhodes;A. Robertson;J. Schmoll;E. Sirks;S. Sivanandam
弱透镜测量的统计能力主要是由其形状被解析的高红移星系的数量驱动的。传统智慧和物理直觉认为，这是通过长波长（红色或近红外）的深度成像来优化的，以避免丢失红移的Balmer-break和Lyman-break星系。我们使用合成发射线（“EL”）-COSMOS目录模拟透镜观测使用不同的过滤器，从不同的高度。这里是预测的曝光次数，以达到目标z ≥ 0.3源密度，使用现成的和定制的过滤器。地面观测在红色波长上更好，空间观测（更狭义）也是如此。然而，我们发现SuperBIT，一个在平流层运行的衍射限制天文台，应该在蓝色波长下进行透镜质量的观测。
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 optimized 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 catalog 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.