Andromeda Surrounded By The Remains Of The Dwarf Galaxies It’s Killed

Our neighboring Andromeda Galaxy may look benign , but it ’s really a monumental cannibal , sitting surrounded by the undigested remnants of the beetleweed it ’s eat . European scientists have represent the wandflower anew , and happen stars that came from elsewhere .

Writing in the new subject of Nature , the researchers excuse that Andromeda is skirt by a halo of remainder from other galaxies , and this provides evidence for the “ hierarchical ” good example of galaxy exploitation , where bigger galaxies grow by eating diminished ones :

In hierarchical cosmological models1 , galaxies grow in mass through the continual accretion of smaller ones . The tidal to-do of these systems is expected to result in loosely bound stars hem in the galaxy , at distance that attain 10–100 times the radius of the central disk2 , 3 . The number , luminosity and morphology of the relics of this process cater significant clues to galaxy formation history4 , but find a comprehensive sketch of these components is unmanageable because of their intrinsic faintness and immense extent . Here we cover a panoramic survey of the Andromeda galax ( M31 ) . We discover stars and coherent structures that are almost certainly leftover of dwarf wandflower demolish by the tidal field of M31 . An improved census of their surviving counterparts imply that three - quarter of M31 ’s orbiter brighter than Mv = -6 await breakthrough . The brightest companion , Triangulum ( M33 ) , is surrounded by a stellar structure that provides persuasive evidence for a late encounter with M31 . This panorama of extragalactic nebula social structure like a shot reassert the canonical tenets of the hierarchical galax formation model and reveals the shared story of M31 and M33 in the constant build - up of galaxies .

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