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- W4306246286 abstract "Andromeda (And) XXV has previously been reported as a dwarf spheroidal galaxy (dSph) with little-to-no dark matter. However, the uncertainties on this result were significant. In this study, we double the number of member stars and re-derive the kinematics and mass of And XXV. We find that And XXV has a systemic velocity of $nu_mathrm{r}=-107.7pm1.0 mathrm{~km s}^{-1}$ and a velocity dispersion of $sigma_nu=4.5pm1.0mathrm{~km s}^{-1}$. With this better constrained velocity dispersion, we derive a mass contained within the half-light radius of $M(r< r_mathrm{h})=6.9^{+3.2}_{-2.8}times10^6mathrm{~M}_odot$. This mass corresponds to a mass-to-light ratio of $mathrm{[M/L]}_mathrm{r_mathrm{h}}=37^{+17}_{-15}mathrm{~M}_odot/mathrm{L}_odot$, demonstrating, for the first time, that And XXV has an unambiguous dark matter component. We also measure the metallicity of And XXV to be $mathrm{[Fe/H]}=-1.9pm0.1$$mathrm{~}$dex, which is in agreement with previous results. Finally, we extend the analysis of And XXV to include mass modelling using GravSphere. We find that And XXV has a low central dark matter density, $rho_mathrm{DM}(150mathrm{pc})= 2.7^{+1.8}_{-1.6}times10^7mathrm{~M}_odotmathrm{kpc}^{-3}$, making And XXV a clear outlier when compared to other Local Group (LG) dSphs of the similar stellar mass. In a companion paper, we will explore whether some combination of dark matter cusp-core transformations and/or tides can explain And XXV's low density." @default.
- W4306246286 created "2022-10-15" @default.
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- W4306246286 date "2023-03-14" @default.
- W4306246286 modified "2023-09-30" @default.
- W4306246286 title "Andromeda XXV – a dwarf galaxy with a low central dark matter density" @default.
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