Object Analysis

Cetus A (Messier 77) is a barred spiral galaxy in the constellation Cetus. Located about 47 million light-years away, it is one of the most famous and closest examples of a Seyfert galaxy—a galaxy with an extremely active and luminous core powered by a supermassive black hole.

The core of M77 is a powerhouse, emitting intense radiation across the entire electromagnetic spectrum, from radio waves to X-rays. The supermassive black hole at its heart is estimated to be 15 million times the mass of the Sun. This core is so bright that it often washes out the details of the surrounding spiral arms in short-exposure images.

The galaxy's spiral arms are tightly wound and show evidence of recent star formation. M77 was one of the first galaxies in which a large-scale spiral structure was identified. It is also a strong source of cosmic rays, which are accelerated to nearly the speed of light by the violent processes in the active nucleus.