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- W4387030672 abstract "Using the final MaNGA sample (DR17) of 10K galaxies, we investigate the dark matter fraction $f_{rm DM}$ within one half-light radius $R_{rm e}$ for about 6K galaxies with good kinematics spanning a wide range of morphologies and stellar velocity dispersion ($1.6lesssim lg,sigma_{rm e}/mathrm{km,s^{-1}}lesssim 2.6$). We employ two techniques to estimate $f_{rm DM}$: (i) Jeans Anisotropic Modelling (JAM), which performs dark matter decomposition based on the stellar kinematics and (ii) comparing the total dynamical mass-to-light ratios $(M/L)_{rm JAM}$ and the $(M_{ast}/L)_{rm SPS}$ from Stellar Population Synthesis (SPS). We find that both methods consistently show a significant trend of increasing $f_{rm DM}$ with decreasing $sigma_{rm e}$, for $lg(sigma_{rm e}/mathrm{km,s^{-1}})lesssim2.1$ and very low $f_{rm DM}$ at larger $sigma_{rm e}$. For the 235 early-type galaxies with the best dynamical models, we explore the variation of the stellar initial mass function (IMF) by comparing the stellar mass-to-light ratios $(M_{ast}/L)_{rm JAM}$ from JAM and SPS. We confirm that the stellar mass excess $alpha_{rm IMF}equiv (M_{ast}/L)_{rm JAM}/(M_{ast}/L)_{rm SPS}$, which reflects the IMF shape, increases with $sigma_{rm e}$, in agreement with previous studies that reported a transition from Chabrier-like to Salpeter IMF among galaxies. We also detect weak positive correlations between $alpha_{rm IMF}$ and age, but no correlations with metallicity ($[Z/H]$). Finally, we stack galaxy spectra according to their $alpha_{rm IMF}$ to search for differences in IMF-sensitive spectral features (e.g. the $rm Na_{rm I}$ doublet). We only find marginal evidence for such differences, which casts doubt on the validity of one or both methods to measure the IMF." @default.
- W4387030672 created "2023-09-26" @default.
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- W4387030672 date "2023-09-21" @default.
- W4387030672 modified "2023-09-27" @default.
- W4387030672 title "MaNGA DynPop -- V. The dark-matter fraction versus stellar velocity dispersion relation and initial mass function variations: dynamical models and full spectrum fitting of integral-field spectroscopy" @default.
- W4387030672 doi "https://doi.org/10.48550/arxiv.2309.12395" @default.
- W4387030672 hasPublicationYear "2023" @default.
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