Landing page for project EL068

Radio-loud quadruply-imaged quasars (quads) have been indisposable tools for our understanding of flux ratio anomalies, their application to detecting CDM substructure, and for making sense of optical observations. Unfortunately no new radio-loud quads have been found in the last two decades. Within a recent search in Gaia, we have uncovered a new optically bright quad with a bright radio counterpart (~10mJy at 3GHz with a likely AGN component). The optical imaging shows a puzzling flux ratio, discrepant with possible mass models and the existing low-resolution radio imaging. We request EVN observations of this new quad at 1.6GHz to resolve the radio emission to determine the image configuration, determine the true flux ratios, and probe the intrinsically faint radio source structure at subparsec resolution, otherwise impossible without lensing.

This data is part of the archive of VLBI data maintained by JIVE on behalf of the EVN, a network of radio telescopes located primarily in Europe and Asia, with additional antennas in South Africa. The EVN archive itself has the DOI https://doi.org/10.17616/R3Z197