New constraints on light axion-like particles using Chandra transmission grating spectroscopy of the powerful cluster-hosted quasar H1821+643

JOURNAL ARTICLE published 24 December 2021 in Monthly Notices of the Royal Astronomical Society

Research funded by Science and Technology Facilities Council (ST/V50659X/1) | European Research Council (742104) | NASA (G08-19088X,G09-20119X) | Swedish Research Council (2018-03641,2019-02337)

Authors: Júlia Sisk-Reynés | James H Matthews | Christopher S Reynolds | Helen R Russell | Robyn N Smith | M C David Marsh