The outflowing ionised gas of I Zw 1 observed by HST COS A. Juráňová, E. Costantini, G. A. Kriss, M. Mehdipour, W. N. Brandt, L. Di Gesu, A. C. Fabian, L. Gallo, M. Giustini, D. Rogantini and D. R. Wilkins A&A, 686 (2024) A99 Published online: 11 June 2024 DOI: 10.1051/0004-6361/202449544