All good things come in threes: the third image of the lensed quasar PKS1830-211
S. Muller (1), S. Jaswanth (1), C. Horellou (1), and I. Marti-Vidal, (2,3) ((1) Department of Space, Earth, Environment, Chalmers University of, Technology, Onsala Space Observatory, Onsala, Sweden, (2) Observatori, Astronomic, Universitat de Valencia, Parc Cientific, Paterna

TL;DR
This paper reports the detection of a third, highly de-magnified lensed image of the quasar PKS1830-211 using ALMA, providing new insights into the lensing model and potential for precise cosmological measurements.
Contribution
First detection of a third lensed image at millimeter wavelengths in PKS1830-211, enhancing lensing models and cosmological parameter estimation.
Findings
Identified a third, faint lensed image of the quasar.
Detected asymmetrical extensions from images A and B at millimeter wavelengths.
Proposed a lensing model consistent with new and previous observations.
Abstract
Strong gravitational lensing distorts our view of sources at cosmological distances but brings invaluable constraints on the mass content of foreground objects and on the geometry and properties of the Universe. We report the detection of a third continuum source toward the strongly lensed quasar PKS1830-211 in ALMA multi-frequency observations of high dynamic range and high angular resolution. This third source is point-like and located slightly to the north of the diagonal joining the two main lensed images, A and B, 0.3 arcsec away from image B. It has a flux density that is ~140 times weaker than images A and B and a similar spectral index, compatible with synchrotron emission. We conclude that this source is most likely the expected highly de-magnified third lensed image of the quasar. In addition, we detect, for the first time at millimeter wavelengths, weak and asymmetrical…
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