학술논문
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
Document Type
Working Paper
Author
Luo, Yifei; Leauthaud, Alexie; Greene, Jenny; Huang, Song; Kado-Fong, Erin; Danieli, Shany; Li, Ting S.; Li, Jiaxuan; Blanco, Diana; Wasleske, Erik J.; Wick, Joseph; Mintz, Abby; Guan, Runquan; Peter, Annika H. G.; Baldassare, Vivienne; Brooks, Alyson; Banerjee, Arka; Bhattacharyya, Joy; Cai, Zheng; Chen, Xinjun; Gunn, Jim; Johnson, Sean D.; Kelvin, Lee S.; Li, Mingyu; Lin, Xiaojing; Lupton, Robert; Mace, Charlie; Medina, Gustavo E.; Read, Justin; Rosado, Rodrigo Cordova; Seifert, Allen
Source
Subject
Language
Abstract
The Merian survey is mapping $\sim$ 850 degrees$^2$ of the Hyper Suprime-Cam Strategic Survey Program (HSC-SSP) wide layer with two medium-band filters on the 4-meter 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 ($\lambda_c = 7080 \unicode{x212B}$, $\Delta\lambda = 275\unicode{x212B}$) and N540 ($\lambda_c = 5400\unicode{x212B}$, $\Delta\lambda = 210\unicode{x212B}$). 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 $8<\rm \log M_*/M_\odot<9$ 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 $\sim$ 85,000 star-forming dwarf galaxies with a photometric redshift accuracy of $\sigma_{\Delta z/(1+z)}\sim 0.01$ and an outlier fraction of $\eta=2.8\%$ over the redshift range $0.058