The Merian survey is an ongoing medium-band imaging survey on the CTIO 4-meter Blanco telescope. With two new medium-band filters on DECam, we expect to detect ~100,000 star-forming dwarf galaxies at z~0.1 in the HSC-SSP wide field (~800 deg^2), aiming to characterize dark matter halo and stellar feedback in dwarf galaxies. The Merian survey will allow us to measure the full dark matter profile of dwarf galaxies via weak gravitational lensing, for the first time. In this talk, I will present how we designed the Merian survey, and discuss the performance by comparing the mock and actual Merian data. I will show the early science results with the Merian Year 1 data release. I will also show that the Merian medium-band filter set is able to select objects at higher redshifts out to z~4.8. In the end, I will discuss dwarf lensing with future surveys such as the DESI-2 medium-band imaging survey.
https://ui.adsabs.harvard.edu/abs/2023arXiv230519310L/abstract
https://ui.adsabs.harvard.edu/abs/2020PDU....3000719L/abstract
BIO
Yifei Luo is currently a PhD student at the University of California Santa Cruz. His research interests focus on the co-evolution between galaxy and dark matter, and the link between galaxy structure and the quenching process. He obtained his bachelor's degree from Nanjing University in 2017 and served as a research assistant at National Astronomical Observatories of China (NAOC) between 2017 and 2018. He will be moving to Berkeley as a LBNL cosmology postdoc fellow this fall.
