According to the expert, the surface of the plasma jet is continuously traversed by stars in its orbit around the center of the galaxy. Thus, the penetration and exit of stars disturbs this surface, generates turbulence and this favors the mixture of the gas of the medium, denser, with that of the jet. The dense gas load eventually decelerates the jet, as indicated by the radio frequency observations.
"It's like when you throw stones into the water and waves are generated. In this case, the idea is that the fall of stones is continuous and, taking into account that the surface that separates the jet from the medium is unstable, these waves produce turbulence and favour the entry of gas from the interstellar medium into the jet, which ends up slowing it down," says Manel Perucho.
Active galaxies are one of the most energetic and spectacular phenomena in the Universe. The fall of matter into the supermassive black hole of its nucleus produces enormous amounts of energy, and exceeds the luminosity of a normal galaxy by orders of magnitude.
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