approximately 800 million Solar masses, including both the mass of the black hole and of the inner core of the gas disk. References External links APOD (2003-05-05) – NASA image & description APOD (2005-07-25) – NASA image showing unusual gas filaments Fabian, A.C., et al. "A deep Chandra observation of the Perseus cluster: shocks and ripples". Monthly Notices of the Royal Astronomical Society. Vol. 344 (2003): L43 (arXiv:astro-ph/0306036v2). Fabian, A.C. Nature 454, 968–970. Gabany, R. Jay. cosmotography.com – An image made with a 20" telescope, which displays the unusual gas filaments Peculiar galaxies Interacting galaxies Seyfert galaxies Starburst galaxies Radio galaxies Luminous infrared galaxies Perseus (constellation) 1275 02669 012429 84 Perseus Cluster 024b