21 cm observations: calibration, strategies, observables
G. Bernardi
TL;DR
This chapter reviews 21 cm interferometric observations, focusing on calibration, strategies, and observables, highlighting current challenges and instrument design considerations for studying the early universe.
Contribution
It provides a comprehensive overview of 21 cm radio interferometry, emphasizing calibration issues, foreground separation, and the impact of instrument design on observations.
Findings
Calibration remains a major challenge in 21 cm observations.
Instrument design influences calibration and data analysis strategies.
Forefront techniques are needed for effective foreground separation.
Abstract
This chapter aims to provide a review of the basics of 21 cm interferometric observations and its methodologies. A summary of the main concepts of radio interferometry and their connection with the 21 cm observables - power spectra and images - is presented. I then provide a review of interferometric calibration and its interplay with foreground separation, including the current open challenges in calibration of 21 cm observations. Finally, a review of 21 cm instrument designs in the light of calibration choices and observing strategies follows.
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Taxonomy
TopicsRadio Astronomy Observations and Technology