Gaia GraL: Gaia DR2 gravitational lens systems – VIII. A radio census of lensed systems

Dougal Dobie, Dominique Sluse, Adam Deller, Tara Murphy, Alberto Krone-Martins, Daniel Stern, Ziteng Wang, Yuanming Wang, Céline Bœhm, S G Djorgovski, Laurent Galluccio, Ludovic Delchambre, Thomas Connor, Jakob Sebastiaan den Brok, Pedro H Do Vale Cunha, Christine Ducourant, Matthew J Graham, Priyanka Jalan, Sergei A Klioner, Jonas KlüterFrançois Mignard, Vibhore Negi, Quentin Petit, Jr Scarano Sergio, Eric Slezak, Jean Surdej, Ramachrisna Teixeira, Dominic J Walton, Joachim Wambsganss

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We present radio observations of 24 confirmed and candidate strongly lensed quasars identified by the Gaia Gravitational Lenses working group. We detect radio emission from eight systems in 5.5 and 9 GHz observations with the Australia Telescope Compact Array (ATCA), and 12 systems in 6 GHz observations with the Karl G. Jansky Very Large Array (VLA). The resolution of our ATCA observations is insufficient to resolve the radio emission into multiple lensed images, but we do detect multiple images from 11 VLA targets. We have analysed these systems using our observations in conjunction with existing optical measurements, including measuring offsets between the radio and optical positions for each image and building updated lens models. These observations significantly expand the existing sample of lensed radio quasars, suggest that most lensed systems are detectable at radio wavelengths with targeted observations, and demonstrate the feasibility of population studies with high-resolution radio imaging.
Original languageEnglish
Article numberstad4002
Pages (from-to)5880-5889
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date11 Jan 2024
Publication statusPublished - 1 Mar 2024


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