Polarimetry of the Lyα envelope of the radio-quiet quasar SDSS J124020.91+145535.6 P. North, M. Hayes, M. Millon, A. Verhamme, M. Trebitsch, J. Blaizot, F. Courbin and D. Chelouche A&A, 684 (2024) A147 Published online: 16 April 2024 DOI: 10.1051/0004-6361/202347423