The Perseus galaxy cluster Abell 426 is one of the most massive objects in the Universe, and one  of the most powerful sources of X-rays. It contains thousands of galaxies. It extends across 863 arcmin of our sky, at a distance of 240 million light years. Its center is the galaxy NGC 1275, towards which other galaxies rush. NGC 1275 is made up of an elliptical galaxy located behind another spiral. The elliptical is the main one. It has a supermassive black hole and is the Rx source of the group (Perseus A). It is a Seyfert galaxy, that is, an active visible galaxy, which emits greater radiation than expected due to its composition due to the accretion of matter on the central black hole. It emits filaments of incandescent gas that are maintained by the action of magnetic fields.

I took L, R, G, B and HII shots on four nights between December 30 and January 7, with a waning moon and moderate humidity. I independently processed L, RGB and H. The final luminance is the product of max(luminance of LRGB, H), and, in chrominance, the R channel is max(R,H). The H signal added lights not visible in LRGB and tinted others in red. In the annotated image you can see how these small red spots are classified as galaxies (PGC). The galaxy NGC 1275 is the largest, in the upper left (northeast) quadrant. It can be seen that its internal structure is more complex than that of other elliptical galaxies. In the background there were red clouds and other clouds in HII, not always coinciding.

In 2003 Fabian et al captured pressure waves coming from the Perseus Cluster.. The sound waves appear to be generated by the inflation of bubbles of relativistic plasma by the central active galactic nucleus in NGC 1275. The time period of this waves  was 9.6 million  years, , acoustically equivalent to a B-flat 57 octaves below middle C. The sonification of these waves (transformation into audible sound) is impressive  (sound)

Annotated image