The Merian survey: design, construction, and characterization of a filter set optimized to find dwarf galaxies and measure their dark matter halo properties with weak lensing
The Merian survey: design, construction, and characterization of a filter set optimized to find dwarf galaxies and measure their dark matter halo properties with weak lensing
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DOI：
10.1093/mnras/stae925
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发表时间：
2023-05
影响因子：
4.8
通讯作者：
Yifei Luo;A. Leauthaud;J. Greene;Song Huang;Erin Kado-Fong;S. Danieli;Ting S. Li;Jiaxuan Li
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文献类型：
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作者：
Yifei Luo;A. Leauthaud;J. Greene;Song Huang;Erin Kado-Fong;S. Danieli;Ting S. Li;Jiaxuan Li
梅利安巡天正在Cerro Tololo美洲天文台的4米Victor M. Blanco望远镜上用两个中频滤光片对超级超级凸轮战略巡天计划（HSC-SSP）宽层进行～ 850度的测绘，目标是对矮星系周围的弱引力透镜进行首次高信噪比（S/N）测量。本文介绍了梅里安滤波集N708 （λc = 7080 Å， Δλ = 275 Å）和N540 （λc = 5400 Å， Δλ = 210 Å）的设计。N708和N540的中心波长和滤光片宽度被设计为通过比较Merian通量和HSC宽带通量来探测质量范围$8\lt \rm \log M_*/M_\odot \lt 9$内星系的$\rm H\alpha$和$\rm [OIII]$发射线。我们的滤光片设计考虑了弱透镜信噪比和光度红移性能。我们的模拟预测，梅里安将产生约85000个恒星形成矮星系的样本，光度红移精度为σΔz/(1 + z) ～ 0.01，在红移范围0.058 < z < 0.10的异常分数为$\eta =2.8~{{\ \rm per\ cent}}$。在布兰科/暗能量相机（DECam）上进行60个完整的夜晚，预计梅利安巡天将测量在r < 0.5 Mpc范围内透镜S/N ～ 32和r < 1.0 Mpc范围内透镜S/N ～ 90的矮星系周围的平均弱透镜轮廓。这个前所未有的恒星形成矮星系的样本将允许研究暗物质和恒星反馈之间的相互作用以及它们在矮星系演化中的作用。
The Merian survey is mapping ∼ 850 deg2 of the Hyper Suprime-Cam Strategic Survey Program (HSC-SSP) wide layer with two medium-band filters on the 4-m Victor M. Blanco telescope at the Cerro Tololo Inter-American Observatory, with the goal of carrying the first high signal-to-noise (S/N) measurements of weak gravitational lensing around dwarf galaxies. This paper presents the design of the Merian filter set: N708 (λc = 7080 Å, Δλ = 275 Å) and N540 (λc = 5400 Å, Δλ = 210 Å). The central wavelengths and filter widths of N708 and N540 were designed to detect the $\rm H\alpha$ and $\rm [OIII]$ emission lines of galaxies in the mass range $8\lt \rm \log M_*/M_\odot \lt 9$ by comparing Merian fluxes with HSC broad-band fluxes. Our filter design takes into account the weak lensing S/N and photometric redshift performance. Our simulations predict that Merian will yield a sample of ∼ 85 000 star-forming dwarf galaxies with a photometric redshift accuracy of σΔz/(1 + z) ∼ 0.01 and an outlier fraction of $\eta =2.8~{{\ \rm per\ cent}}$ over the redshift range 0.058 < z < 0.10. With 60 full nights on the Blanco/Dark Energy Camera (DECam), the Merian survey is predicted to measure the average weak lensing profile around dwarf galaxies with lensing S/N ∼32 within r < 0.5 Mpc and lensing S/N ∼90 within r < 1.0 Mpc. This unprecedented sample of star-forming dwarf galaxies will allow for studies of the interplay between dark matter and stellar feedback and their roles in the evolution of dwarf galaxies.