Distance and mass of the M 104 (Sombrero) group Igor D. Karachentsev, Lidia N. Makarova, R. Brent Tully, Gagandeep S. Anand, Luca Rizzi and Edward J. Shaya A&A, 643 (2020) A124 Published online: 11 November 2020 DOI: 10.1051/0004-6361/202038928