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• W3204753455 endingPage "42" @default.
• W3204753455 startingPage "42" @default.
• W3204753455 abstract "Half of the satellite galaxies of Andromeda form a narrow plane termed the Great Plane of Andromeda (GPoA), and their line-of-sight velocities display correlation reminiscent of a rotating structure. Recently reported first proper motion measurements for the on-plane satellites NGC 147 and NGC 185 indicate that they indeed co-orbit along the GPoA. This provides a novel opportunity to compare the M31 satellite system to $Lambda$CDM expectations. We perform the first detailed comparison of the orbital alignment of two satellite galaxies beyond the Milky Way with several hydrodynamical and dark-matter-only cosmological simulations (Illustris TNG-50, TNG-100, ELVIS, PhatELVIS), in the context of the Planes of Satellite Galaxies Problem. In line with previous works, we find that the spatial flattening and line-of-sight velocity correlation alone is already in substantial tension with $Lambda$CDM, with none of the simulated analogs simultaneously reproducing both parameters. Almost none (3 to 4%) of the simulated systems contain two satellites with orbital poles as well aligned with their satellite plane as indicated by the most-likely proper motions of NGC 147 and NGC 185. However, within current measurement uncertainties it is common (~70%) that the two best-aligned satellites of simulated systems are consistent with the orbital alignment. Yet, the chance that any two simulated on-plane satellites have as well aligned orbital poles as observed is low (~4%). We conclude that confirmation of the tight orbital alignment for these two objects via improved measurements, or the discovery of similar alignments for additional GPoA members, hold the potential to further raise the tension with $Lambda$CDM expectations." @default.
• W3204753455 created "2021-10-11" @default.
• W3204753455 creator A5000664274 @default.
• W3204753455 creator A5018735147 @default.
• W3204753455 date "2021-12-01" @default.
• W3204753455 modified "2023-10-09" @default.
• W3204753455 title "On the Co-orbitation of Satellite Galaxies along the Great Plane of Andromeda: NGC 147, NGC 185, and Expectations from Cosmological Simulations" @default.
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• W3204753455 doi "https://doi.org/10.3847/1538-4357/ac2aa9" @default.
• W3204753455 hasPublicationYear "2021" @default.
• W3204753455 type Work @default.

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