New perspectives on galactic angular momentum, galaxy formation, and the
  Hubble Sequence
  This paper provides a summary of our recent work on the scaling relations
between the specific angular momentum j_* and mass M_* of the stellar parts of
normal galaxies of different bulge fraction beta_*. We find that the
observations are consistent with a simple model based on a linear superposition
of disks and bulges that follow separate scaling relations of the form j_*d ~
M_*d^alpha and j_*b ~ M_*b^alpha with alpha = 0.67 +/- 0.07 but offset from
each other by a factor of 8 +/- 2 over the mass range 8.9 <= log (M_*/M_Sun) <=
11.8. This model correctly predicts that galaxies follow a curved 2D surface in
the 3D space of log j_*, log M_*, and beta_*.
