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arXiv · 2310.04494

PSJ2107-1611: a new wide-separation, quadruply imaged lensed quasar with flux ratio anomalies

Frédéric Dux·Cameron Lemon·Frédéric Courbin·Dominique Sluse·Alain Smette·Timo Anguita·Favio Neira
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Abstract

We report the discovery of PSJ2107-1611, a fold-configuration 4.3"-separation quadruply lensed quasar with a bright lensed arc. It was discovered using a convolutional neural network on Pan-STARRS gri images of pre-selected quasar candidates with multiple nearby Pan-STARRS detections. Spectroscopic follow-up with EFOSC2 on the ESO 3.58m New Technology Telescope reveals the source to be a quasar at z = 2.673, with the blended fold image pair showing deformed broad lines relative to the other images. The flux ratios measured from optical to near-infrared imaging in the Canada-France-Hawaii Telescope Legacy Survey, Pan-STARRS, the Legacy Surveys, and the Vista Hemisphere Survey are inconsistent with a smooth mass model as the fold pair images are about 15 times too faint. Variability, time delay effects, and reddening are ruled out through multiple-epoch imaging and color information. The system is marginally resolved in the radio in the Very Large Array Sky Survey S-band, where it has a 10 mJy detection. The radio flux ratios are compatible with the smooth mass macromodel. This system offers a unique tool for future studies of quasar structure with strong and microlensing. A more detailed analysis of follow-up with JWST/MIRI, VLT/MUSE, VLT/ERIS, and data from the European Very Long Baseline Interferometer will be presented in an upcoming paper.

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Frédéric Dux, Cameron Lemon, Frédéric Courbin, Dominique Sluse, Alain Smette, Timo Anguita, Favio Neira. 2023-10-06. PSJ2107-1611: a new wide-separation, quadruply imaged lensed quasar with flux ratio anomalies. https://doi.org/10.1051/0004-6361/202348227

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