1 research outputs found
Gaia GraL: Gaia DR2 Gravitational Lens Systems. VIII. A radio census of lensed systems
We present radio observations of 24 confirmed and candidate strongly lensed
quasars identified by the Gaia Gravitational Lenses (GraL) working group. We
detect radio emission from 8 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