Matches in SemOpenAlex for { <https://semopenalex.org/work/W2783606013> ?p ?o ?g. }
- W2783606013 endingPage "4054" @default.
- W2783606013 startingPage "4043" @default.
- W2783606013 abstract "Our nearest large cosmological neighbour, the Andromeda galaxy (M31), is a dynamical system, and an accurate measurement of its total mass is central to our understanding of its assembly history, the life-cycles of its satellite galaxies, and its role in shaping the Local Group environment. Here, we apply a novel approach to determine the dynamical mass of M31 using high velocity Planetary Nebulae (PNe), establishing a hierarchical Bayesian model united with a scheme to capture potential outliers and marginalize over tracers unknown distances. With this, we derive the escape velocity run of M31 as a function of galacto-centric distance, with both parametric and non-parametric approaches. We determine the escape velocity of M31 to be $470pm{40}$ km s$^{-1}$ at a galacto-centric distance of 15 kpc, and also, derive the total potential of M31, estimating the virial mass and radius of the galaxy to be $0.8pm{0.1}times10^{12},M_odot$ and $240pm{10}$ kpc, respectively. Our M31 mass is on the low-side of the measured range, this supports the lower expected mass of the M31-Milky Way system from the timing and momentum arguments, satisfying the HI constraint on circular velocity between $10lesssim R/textrm{kpc}<35$, and agreeing with the stellar mass Tully-Fisher relation. To place these results in a broader context, we compare them to the key predictions of the $Lambda{rm CDM}$ cosmological paradigm, including the stellar-mass-halo-mass and the dark matter halo concentration-virial mass correlation, and finding it to be an outlier to this relation." @default.
- W2783606013 created "2018-01-26" @default.
- W2783606013 creator A5014863777 @default.
- W2783606013 creator A5034317478 @default.
- W2783606013 creator A5053641943 @default.
- W2783606013 creator A5058938677 @default.
- W2783606013 creator A5089501032 @default.
- W2783606013 date "2018-01-10" @default.
- W2783606013 modified "2023-10-09" @default.
- W2783606013 title "The need for speed: escape velocity and dynamical mass measurements of the Andromeda galaxy" @default.
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