'Scraggy' dark halos around bulge-less spiral galaxies
  We use a sample of 220 face-on bulge-less galaxies situated in the low
density environment to estimate their total mass via orbital motions of
supposed rare satellites. Our inspection reveals 43 dwarf companions having the
mean projected separation of 130 kpc and the mean-square velocity difference of
96 km/s. For them, we obtain the mean orbital-mass-to-K-band luminosity ratio
of $20\pm3$. Seven bulge-less spirals in the Local Volume are also
characterized by the low mean ratio, $M_{orb}/L_K = 22\pm5$. We conclude that
bulge-less Sc-Scd-Sd galaxies have poor dark halos, about two times lower than
that of bulgy spiral galaxies of the same stellar mass.
