Massive star-forming galaxies have converted most of their halo gas into stars Ziwen Zhang, Huiyuan Wang, Wentao Luo, Jun Zhang, Houjun Mo, YiPeng Jing, Xiaohu Yang and Hao Li A&A, 663 (2022) A85 Published online: 14 July 2022 DOI: 10.1051/0004-6361/202142866