A Newly Discovered ‘Einstein’s Cross’ Reveals the Existence of a Giant Dark Matter Halo
A paper on HerS-3:
https://iopscience.iop.org/article/10.3847/1538-4357/adf204
"Detailed 1 mm spectroscopy and imaging with NOEMA and the Atacama Large Millimeter/submillimeter Array resolve the individual images and show that each of the five images display a series of molecular lines that have similar central velocities, unambiguously confirming that they have identical redshifts."
https://iopscience.iop.org/article/10.3847/1538-4357/adf204
"Detailed 1 mm spectroscopy and imaging with NOEMA and the Atacama Large Millimeter/submillimeter Array resolve the individual images and show that each of the five images display a series of molecular lines that have similar central velocities, unambiguously confirming that they have identical redshifts."