X-Shaped Radio Galaxies Might Form More Simply Than Expected When astronomers gaze into the night sky using radio telescopes, they often see elliptical-shaped galaxies, with twin jets blasting from either side of their central supermassive black hole. However, every once in a while — less than 10%
Three-dimensional volume rendering of density illustrates the natural development of X-shaped jet morphology. See embedded video below for more detail. Credit: Aretaios Lalakos/Northwestern UniversityWhen astronomers gaze into the night sky using radio telescopes, they often see elliptical-shaped galaxies, with twin jets blasting from either side of their central supermassive.
Surprisingly, the researchers discovered that the galaxy’s characteristic X-shape resulted from the interaction between the jets and the gas falling into the. Early in the simulation, the infalling gas deflected the newly formed jets, which turned on and off, erratically wobbled, and inflated pairs of cavities in different directions to resemble an X-shape. However, eventually, the jets became strong enough to push through the gas.
Three-dimensional volume rendering of density illustrates the natural development of X-shaped jet morphology. Gas infall forms an accretion flow deep within which we witness the formation of an accretion disk that feeds the black hole, that launches a pair of relativistic jets , which propagate vertically and shock the ambient gas .
In previous simulations, other astrophysicists have attempted to create X-shaped structures artificially in order to examine how they arise. But Lalakos’ simulation organically led to the X-shape.
France Dernières Nouvelles, France Actualités
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