Research report 2020 - Max Planck Institute for Extraterrestrial Physics
Holm 15A and the most massive black hole in the local universe
Kianusch Mehrgan, Jens Thomas
Max-Planck-Institut für extraterrestrische Physik, Garching
SummaryWhich galaxies harbour the most massive black holes? Even though galaxies tend to get more luminous towards their centres, the most massive galaxies exhibit a deficit of stars in their centres. The giant galaxy Holm 15A exhibits a particularly large deficit, and in this galaxy, we found a 40-billion-solar-mass black hole – the most massive known today. The faint centres of giant galaxies thus are an important indicator for the mass of their black hole – potentially even at distances, where direct measurements are not possible today.