Speaker
Julien Girard
(Observatoire de Paris)
Description
With unprecedented sensitivity and field of view, new generation radiotelescopes at low frequencies have to face new calibration challenges. One of the main drivers to cope with direction-dependent distortion (due to strong off-axis sources) is to develop a knowledge of beamshapes and how they vary in frequency and direction. I am going to present recent modelling work carried on VLA and MeerKAT beam modelling, required for high dynamic imaging with these large interferometers. At low frequencies with the NenuFAR radiotelescope, I will also discuss the impact of this modelling on current Cosmic Dawn observations.
Primary author
Julien Girard
(Observatoire de Paris)
