Galaxies NGC 4342 and NGC 4291.
Image credits: X-ray: NASA/CXC/SAO/A.Bogdan et al;
Infrared: 2MASS/UMass/IPAC-Caltech/ NASA/NSF.
New evidence from NASA's Chandra X-ray Observatory challenges prevailing ideas about how black holes grow in the centers of galaxies. Astronomers long have thought that a supermassive black hole and the bulge of stars at the center of its host galaxy grow at the same rate -- the bigger the bulge, the bigger the black hole. However, a new study of Chandra data has revealed two nearby galaxies with supermassive black holes that are growing faster than the galaxies themselves.(read more)