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• W2146201425 abstract "Given a flurry of recent claims for systematic variations in the stellar initial mass function (IMF), we carry out the first inventory of the observational evidence using different approaches. This includes literature results, as well as our own new findings from combined stellar-populations synthesis (SPS) and Jeans dynamical analyses of data on $sim$~4500 early-type galaxies (ETGs) from the SPIDER project. We focus on the mass-to-light ratio mismatch relative to the Milky Way IMF, dimf, correlated against the central stellar velocity dispersion, sigs. We find a strong correlation between dimf and sigs, for a wide set of dark matter (DM) model profiles. These results are robust if a uniform halo response to baryons is adopted across the sample. The overall normalization of dimf, and the detailed DM profile, are less certain, but the data are consistent with standard cold-DM halos, and a central DM fraction that is roughly constant with sigs. For a variety of related studies in the literature, using SPS, dynamics, and gravitational lensing, similar results are found. Studies based solely on spectroscopic line diagnostics agree on a Salpeter-like IMF at high sigs, but differ at low sigs. Overall, we find that multiple independent lines of evidence appear to be converging on a systematic variation in the IMF, such that high-sigs ETGs have an excess of low-mass stars relative to spirals and low-sigs ETGs. Robust verification of super-Salpeter IMFs in the highest-sigs galaxies will require additional scrutiny of scatter and systematic uncertainties. The implications for the distribution of DM are still inconclusive." @default.
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• W2146201425 date "2013-02-11" @default.
• W2146201425 modified "2023-09-26" @default.
• W2146201425 title "AN INVENTORY OF THE STELLAR INITIAL MASS FUNCTION IN EARLY-TYPE GALAXIES" @default.
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• W2146201425 doi "https://doi.org/10.1088/0004-637x/765/1/8" @default.
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