# Discovery and first models of the quadruply lensed quasar SDSS J1433+6007

## TL;DR

This paper reports the discovery of a new quadruply lensed quasar using a novel outlier-selection method in SDSS data, providing initial models and observations that contribute to gravitational lensing studies.

## Contribution

Introduces a new outlier-selection technique for discovering quadruply lensed quasars without prior spectroscopic data, and presents the first models and observations of SDSS J1433+6007.

## Key findings

- Discovery of the quadruply lensed quasar SDSS J1433+6007.
- Spectroscopic confirmation of quasar at redshift 2.74.
- Initial lens models and image configurations.

## Abstract

We report the discovery of the quadruply lensed quasar J1433+6007, mined in the SDSS DR12 photometric catalogues using a novel outlier-selection technique, without prior spectroscopic or UV excess information. Discovery data obtained at the Nordic Optical telescope (NOT, La Palma) show nearly identical quasar spectra at $z_s=2.74$ and four quasar images in a fold configuration, one of which sits on a blue arc. The deflector redshift is $z_{l}=0.407,$ from Keck-ESI spectra. We describe the selection procedure, discovery and follow-up, image positions and $BVRi$ magnitudes, and first results and forecasts from simple lens models.