Speaker
Rashi Srivastava
(University of Manchester)
Description
Global 21 cm experiments measure the absolute sky temperature at low radio frequencies, offering a potential low-resolution reference for large-scale sky models. However, the measurement is strongly shaped by the antenna beam, whose imperfect calibration can mix spurious sky structure into the observed spectrum. I present simulations testing whether controlled antenna rotation can help separate beam effects from true sky signals. By comparing different rotation strategies with realistic beams and sky models, this work explores a practical route toward improved absolute calibration for global sky analysis.