Hercules A is the brightest radio source in the constellation of Hercules. Astronomers found that the double-peaked radio emission was centered on a giant elliptical galaxy known as 3C 348. This galaxy is not found within a large cluster of hundreds of galaxies, but rather within a comparatively small group of dozens of galaxies. The active part of the galaxy is the supermassive black hole in its core, sending out strong jets of energetic particles that produce enormous lobes of radio emission. It’s been suggested that Hercules A may be the result of two galaxies merging together.
This video imagines a three-dimensional look at the combined visible light (Hubble Space Telescope) and radio emission (Very Large Array) from Hercules A. The radio lobes dwarf the large galaxy and extends throughout the volume of the surrounding galaxy group. This visualization is only a scientifically reasonable guess of the three-dimensional structures. For example, the galaxy distances within the group are based on a statistical model, and not measured values.
Video Credit: NASA