MUNICH, Germany, Dec. 21 -- Astronomy and Astrophysics, a journal that says it features astronomy and astrophysics from the European Southern Observatory, published research articles on the following topics in its January 2023 edition:

Cosmology (including clusters of galaxies):

* Deep low-frequency radio observations of Abell 2256 - II. The ultra-steep spectrum radio halo

* Suppressing variance in 21 cm signal simulations during reionization