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NGC 7600 (Shell Galaxy)


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NGC 7600
Shell Galaxy (殻状銀河)
Elliptical Galaxy (楕円銀河)
Gx E-S0

別名 (Other names)
PGC 71029, MCG -1-59-19

明るさ (Brightness)
11.9等級

星座 (Constellation)
みずがめ座 (Aqr) (Aquarius)


距離 (Distance)
1億6,000万光年 (160 million light-years)

NGC 7600 (Shell Galaxy) is an elliptical galaxy located 160 million light years from the Earth in the constellation Aquarius.

NGC 7600 (Shell Galaxy) : Picture

Shell Galaxy NGC 7600
Shell Galaxy NGC 7600
(C) Ken Crawford (Rancho Del Sol Observatory)
Collaboration: Andrew Cooper (MPA), Carlos Frenk, John Helly, Shaun Cole (Institute for Computational Cosmology), David Martinez-Delgado (MPIA), Star Stream Pilot Survey Group, NASA
Similar in size to the Milky Way, elliptical galaxy NGC 7600 is about 160 million light-years distant. In this deep image, spanning about 1/2 degree on the sky toward the constellation Aquarius, NGC 7600 sports a remarkable outer halo of nested shells and broad circumgalactic structures. The tantalizing features can be explained by the accretion of dark matter and stars on a cosmic timescale. In fact, a movie generated by simulating galaxy formation using a cosmological model with cold dark matter for the halos of merging galaxies reproduces the appearance of NGC 7600 in amazing detail. The remarkable simulation movie is available here on Vimeo and here in other formats. It presents compelling evidence that detailed features of galaxy mergers observed with small, wide field telescopes on planet Earth, are natural consequences of galaxy formation and fundamental properties of dark matter.

NGC 7600
NGC 7600
(C) Ken Crawford
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NGC 7600 (Shell Galaxy) : Movie

Shell galaxies form in the context of cold dark matter
This simulation is a full cosmological N-body model based on the "cold dark matter theory". It shows how the continuous accretion of clumps of dark matter and stars creates diffuse structures in the haloes of massive elliptical galaxies. These bear a striking resemblance to the shells observed around the nearby elliptical galaxy NGC 7600.
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