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- W2023360263 abstract "We have obtained ~100 pc resolution CO and ~60 pc resolution Hα observations of the dwarf spiral galaxy NGC 4605. We use them to derive a high-resolution rotation curve and study the central density profile of NGC 4605's dark matter halo. We find that these observations do not agree with the predictions of most high-resolution cold dark matter calculations. We investigate two extreme cases: (1) NGC 4605 has a maximal exponential disk, which we model using K-band observations and remove to study the structure of its dark matter halo, and (2) NGC 4605 is dark matter-dominated, and its disk is dynamically negligible. Because the mass-to-light ratio of the maximal disk is already very low, we favor the first solution, which indicates the halo has one component with a density profile ρ ∝ r-0.65 out to R ~ 2.8 kpc. In the second case, the rotation curve requires the presence of two components: a small (~600 pc) core surrounded by a much steeper ρ ∝ r-1.1 halo. Removal of intermediate (submaximal) disks does not ameliorate the discrepancy between the predictions and the observations." @default.
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- W2023360263 date "2002-01-20" @default.
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- W2023360263 title "The Density Profile of the Dark Matter Halo of NGC 4605" @default.
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- W2023360263 doi "https://doi.org/10.1086/324596" @default.
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