A blazar is an elliptical galaxy with a supermassive black hole at the center.
BL Lacertae is the active center of an elliptical galaxy.
I believe that would be exactly the term - "active supermassive black hole". The term "active galaxy" or "active radiogalaxy" is also used for a galaxy that produces large amount of certain radiations; however, such radiation is really caused by the supermassive black hole.
The center of many galaxies is suspected to house a "supermassive black hole". The black hole may even weigh more than all the stars in that galaxy combined. Spiral galaxies are more likely to contain a supermassive black hole.
A Supermassive black hole .
At the center of every galaxy is a supermassive black hole.
At the center of every galaxy is a supermassive black hole.
The supermassive blackholes at the center of galaxies.
There have been a number of odd and bizarre theories for quasi-stellar radio sources, or "quasars". The current hypothesis is that they surround black holes in the centers of active galaxies. In fact, we suspect that our own Milky Way galaxy has a supermassive black hole in the center, and that it may once have been an "active galaxy". If so, that explains why there are no ancient aliens in the galaxy; the radiation would have killed them all billions of years ago!
The best evidence for a supermassive black hole in the center of the Milky Way galaxy comes from observations of the orbits of stars near the galactic center. These stars move at high speeds around an invisible object with a mass millions of times that of the Sun, indicating the presence of a supermassive black hole.
Most astrophysicists believe that there is a supermassive black hole at the center of the Milky Way.
Astronomers believe a supermassive black hole lies at the center of the Milky Way galaxy because of the high speeds of stars and gas near the center, as well as the intense radiation emitted from that region. These observations suggest the presence of a massive object that can only be explained by a supermassive black hole.
Supermassive black holes can be found at the center of most galaxies, including our own Milky Way galaxy.