PSJ2107-1611: a new wide-separation, quadruply imaged lensed quasar with flux ratio anomalies
arXiv:2310.04494 · doi:10.1051/0004-6361/202348227
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.
5 pages, 3 figures, letter
References in corpus (12)
- lenstronomy II: A gravitational lensing software ecosystem
- High resolution imaging of the anomalous flux-ratio gravitational lens system CLASS B2045+265: Dark or luminous satellites?
- A calibration of the stellar mass fundamental plane at z ~ 0.5 using the micro-lensing induced flux ratio anomalies of macro-lensed quasars
- Gravitationally lensed quasars in Gaia -- IV. 150 new lenses, quasar pairs, and projected quasars
- TDCOSMO II: 6 new time delays in lensed quasars from high-cadence monitoring at the MPIA 2.2m telescope
- A lensed radio jet at milli-arcsecond resolution I: Bayesian comparison of parametric lens models
- Constraining quasar structure using high-frequency microlensing variations and continuum reverberation
- STARRED: a two-channel deconvolution method with Starlet regularization
- Finding quadruply imaged quasars with machine learning. I. Methods
- Spatially Resolved Patchy Lyman- Emission Within the Central Kiloparsec of a Strongly Lensed Quasar Host Galaxy at z = 2.8
- Discovery of a radio jet in the Cloverleaf Quasar at z = 2.56
- High-resolution imaging with the International LOFAR Telescope: Observations of the gravitational lenses MG 0751+2716 and CLASS B1600+434