Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 743, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/743/1/L21
Keywords
galaxies: elliptical and lenticular, cD; galaxies: halos; galaxies: individual (NGC 7600); galaxies: kinematics and dynamics; galaxies: peculiar; galaxies: structure
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Funding
- Royal Society [267291]
- ERC
- Leverhulme Fellowship
- Danish National Research Foundation
- STFC
- Science and Technology Facilities Council [ST/I001166/1, ST/F002289/1, ST/I00162X/1, ST/H008519/1] Funding Source: researchfish
- STFC [ST/I001166/1, ST/I00162X/1, ST/H008519/1, ST/F002289/1] Funding Source: UKRI
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We present new deep observations of shell structures in the halo of the nearby elliptical galaxy NGC 7600, alongside a movie of galaxy formation in a cold dark matter (CDM) universe. The movie, based on an ab initio cosmological simulation, shows how continuous accretion of clumps of dark matter and stars creates a swath of diffuse circumgalactic structures. The disruption of a massive clump on a near-radial orbit creates a complex system of transient concentric shells which bare a striking resemblance to those of NGC 7600. With the aid of the simulation we interpret NGC 7600 in the context of the CDM model.
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