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- W2536454611 abstract "We present a quantitative measurement of the amount of clustering present in the inner $sim30$ kpc of the stellar halo of the Andromeda galaxy (M31). For this we analyse the angular positions and radial velocities of the carefully selected Planetary Nebulae (PNe) in the M31 stellar halo. We study the cumulative distribution of pair-wise distances in angular position and line of sight velocity space, and find that the M31 stellar halo contains substantially more stars in the form of close pairs as compared to that of a featureless smooth halo. In comparison to a smoothed/scrambled distribution we estimate that the clustering excess in the M31 inner halo is roughly $40%$ at maximum and on average $sim 20%$. Importantly, comparing against the 11 stellar halo models of cite{2005ApJ...635..931B}, which were simulated within the context of the $Lambda{rm CDM}$ cosmological paradigm, we find that the amount of substructures in the M31 stellar halo closely resembles that of a typical $Lambda{rm CDM}$ halo." @default.
- W2536454611 created "2016-10-28" @default.
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- W2536454611 date "2016-10-23" @default.
- W2536454611 modified "2023-10-09" @default.
- W2536454611 title "Architecture of the Andromeda galaxy: a quantitative analysis of clustering in the inner stellar halo" @default.
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- W2536454611 doi "https://doi.org/10.1093/mnras/stw2732" @default.
- W2536454611 hasPublicationYear "2016" @default.
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