MAQ Magazine n. 14 / September 2019
shows how the black hole winds have an impact on the galaxy on a larger scale, probably providing the missing link ".
There are two types of outflows in X-ray spectra emitted by active galactic nuclei, the dense central regions of galaxies with supermassive black holes in the center. They are the so-called ultra-fast outflows (UFO, ultra-fast outflow), made of highly ionized gas, they travel at speeds that can reach 40 percent of that of light, and are observed near the central black hole.
The other type of gas is the slower outflows, also called "warm absorbers", which travel at much lower speeds, in the order of hundreds of km / s, and show physical characteristics - such as the density of the particles, or their ionization - similar to those of the surrounding interstellar matter. These slower outflows have a higher probability of being detected at greater distances from the center of the galaxy.