Quantiles as Robust Probes of Non-Gaussianity in 21-cm Images

Understand

The early epoch in which the first stars and galaxies formed is among the most exciting unexplored eras of the Universe.

• A major research effort focuses on probing this era with the 21-cm spectral line of hydrogen.
• While most research focused on statistics like the 21-cm power spectrum or the sky-averaged global signal, there are other ways to analyze tomographic 21-cm maps, which may lead to novel insights.
• We suggest statistics based on quantiles as a method to probe non-Gaussianities of the 21-cm signal.