Multi-wavelength spectroscopic analysis of the ULX Holmberg II X-1 and its nebula suggests the presence of a heavy black hole accreting from a B-type donor - Reyero Serantes, Sabela; Oskinova, L.; Hamann, W.-R.; Gómez-González, V. M. A.; Todt, H.; Pauli, D.; Soria, R.; Gies, D. R.; Torrejón, J. M.; Bulik, T.; Ramachandran, Varsha; Sander, Andreas A. C.; et al. (Astronomy and astrophysics, 2024)
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