Finding Lensed Radio Sources with the VLA Sky Survey
arxiv(2024)
Abstract
Radio observations of strongly lensed objects are valuable as cosmological
probes. Lensed radio sources have proven difficult to identify in large part
due to the limited depth and angular resolution of the previous generation of
radio sky surveys, and as such, only a few dozen lensed radio sources are
known. In this work we present the results of a pilot study using the Very
Large Array Sky Survey (VLASS) in combination with optical data to more
efficiently identify lensed radio sources. We obtain high-resolution (0.2") VLA
follow-up observations for 11 targets that we identify using three different
techniques: i) a search for compact radio sources offset from galaxies with
high lensing potential, ii) VLASS detections of known lensed galaxies, iii)
VLASS detections of known lensed quasars. 5 of our targets show radio emission
from the lensed images, including 100
This work demonstrates the efficacy of combining deep and high-resolution
wide-area radio and optical survey data to efficiently find lensed radio
sources, and we discuss the potential impact of such an approach using
next-generation surveys with the Vera C. Rubin Observatory, Euclid, and Nancy
Grace Roman Space Telescope.
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