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Galaxies in the Perseus Cluster


For galaxies, as for people, living in a crowd is different from living alone. Recently, astronomers used the National Science Foundation's Karl G. Jansky Very Large Array (VLA) to learn how a crowded environment affects galaxies in the Perseus Cluster, a collection of thousands of galaxies some 240 million light-years from Earth.


Galaxies in the Perseus Cluster
Galaxies in the Perseus Cluster, left to right: NGC 1275, NGC 1265, IC 310. Left: The giant galaxy
NGC 1275, at the core of the cluster, is seen in new detail, including a newly-revealed wealth of
complex, filamentary structure in its radio lobes. Center: The galaxy NGC 1265 shows the effects
of its motion through the tenuous material between the galaxies. Its radio jets are bent backward
by that interaction, then merge into a single, broad "tail." The tail then is further bent, possibly
by motions within the intergalactic material. Right: The jets of the galaxy IC 310 are bent
backward, similarly to NGC 1265, but appear closer because of the viewing angle from
Earth. That angle also allows astronomers to directly observe energetic gamma rays
generated near the supermassive black hole at the galaxy's core
[Credit: M. Gendron-Marsolais et al.; S. Dagnello,
NRAO/AUI/NSF; Sloan Digital Sky Survey]



Left
: The giant galaxy NGC 1275, at the core of the cluster, is seen in new detail, including a newly-revealed wealth of complex, filamentary structure in its radio lobes.


Center: The galaxy NGC 1265 shows the effects of its motion through the tenuous material between the galaxies. Its radio jets are bent backward by that interaction, then merge into a single, broad "tail." The tail then is further bent, possibly by motions within the intergalactic material.


Right: The jets of the galaxy IC 310 are bent backward, similarly to NGC 1265, but appear closer because of the viewing angle from Earth. That angle also allows astronomers to directly observe energetic gamma rays generated near the supermassive black hole at the galaxy's core.




Such images can help astronomers better understand the complex environment of galaxy clusters, which are the largest gravitationally-bound structures in the universe, and which harbor a variety of still poorly-understood phenomena.


"These images show us previously-unseen structures and details and that helps our effort to determine the nature of these objects," said Marie-Lou Gendron-Marsolais, an ESO/ALMA Fellow in Santiago, Chile. She and a number of international collaborators are announcing their results in the Monthly Notices of the Royal Astronomical Society.


Source: National Radio Astronomy Observatory [November 12, 2020]



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