Using only lensing data and selection corrections, the SLACS sample constrains a degenerate ridge between stellar IMF mismatch and dark matter contraction, and predicts a 5 percent upward bias in velocity dispersions.
S., Burles, S., Koopmans, L
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The SLACS strong lens sample, debiased. II. Lensing-only constraints on the stellar IMF and dark matter contraction in early-type galaxies
Using only lensing data and selection corrections, the SLACS sample constrains a degenerate ridge between stellar IMF mismatch and dark matter contraction, and predicts a 5 percent upward bias in velocity dispersions.