Episode 22 - ORCs, rings, and Galactic histories

In this episode, Payel and Nicole discuss what happens to the metallicity gradient of a satellite galaxy after it merges with its host, the existence of intermediate-age RR lyrae and radio rings, the possibility of determining the history of the inner Milky Way from radially migrated stars, and the possibility of finding more Einstein rings using a new approach that utilises both spectra and images.

From order to chaos: the blurred out metallicity gradient of the Gaia-Enceladus/Sausage progenitor - Andreia Carillo et al.

First direct detection of an RR Lyrae star conclusively associated with an intermediate-age cluster - Cecilia Mateu et al.

RAD@home discovery of extragalactic radio rings and odd radio circles: clues to their origins - Ananda Hota et al.

A New Way to Discover Strong Gravitational Lenses: Pair-wise Spectroscopic Search from DESI DR1 - Yuan-Ming Hsu et al.

Chronology of our Galaxy from Gaia colour-magnitude diagram fitting (ChronoGal): IV. On the inner Milky Way stellar age distribution - Tomás Ruiz-Lara et al.