Speaker
Description
Massive quiescent galaxies at high redshift carry a fossil record of the physical processes that shut down their star formation. I will present highlights that leverage two complementary probes: the cold dust reservoirs of massive quiescent galaxies, and their globular cluster populations. New constraints on dust in strongly lensed quiescent galaxies show how quenching timescale imprints on the interstellar medium, with rapid shutdowns leaving galaxies dust-poor, while gradual quenching lets dust survive. Several of these unique laboratories also reveal new evidence for late-stage dust production from the poorly understood TP-AGB phase. With JWST, we can now also detect globular cluster systems around quiescent galaxies at high redshift, using their demographics to disentangle in-situ star formation from ex-situ assembly and to reconstruct star formation histories. Drawing on results from several papers in progress, I will place these findings in the broader context of massive galaxy quenching, highlighting open questions and what these complementary probes can teach us about quenching pathways in the early universe.