Authors: Kassin et al.
The authors propose a simple solution for the angular momentum catastrophe: measure the DM specific
angular momentum (j) at the radius of baryonic collapse, defined as R_BC in their work, which is
smaller than the R_vir and hence has a higher concentration of DM encompassed in it. Assuming the
standard picture of galaxy formation where the baryons collapse from inside to outside in a DM halo,
they are able to make a reasonable case for their R_BC parameter. The measurement of j at an inner
radius leads to an agreement in the baryonic and DM j which they are able to constrain from
observational data. Although they only run a DM-only simulation, certain assumptions about the j
of the observed spiral galaxies (relating their circular velocity to the angular momentum) allow
them to relate their simulated DM haloes and observed galaxies.
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