The ATLAS3D project - XVIII. CARMA CO imaging survey of early-type
  galaxies
  We present the Combined Array for Research in Millimeter Astronomy (CARMA)
ATLAS3D molecular gas imaging survey, a systematic study of the distribution
and kinematics of molecular gas in CO-rich early-type galaxies. Our full sample
of 40 galaxies (30 newly mapped and 10 taken from the literature) is complete
to a 12CO(1-0) integrated flux of 18.5 Jy km/s, and it represents the largest,
best-studied sample of its type to date. A comparison of the CO distribution of
each galaxy to the g-r color image (representing dust) shows that the molecular
gas and dust distributions are in good agreement and trace the same underlying
interstellar medium. The galaxies exhibit a variety of CO morphologies,
including discs (50%), rings (15%), bars+rings (10%), spiral arms (5%), and
mildly (12.5%) and strongly (7.5%) disrupted morphologies. There appear to be
weak trends between galaxy mass and CO morphology, whereby the most massive
galaxies in the sample tend to have molecular gas in a disc morphology. We
derive a lower limit to the total accreted molecular gas mass across the sample
of 2.48x10^10 Msuns, or approximately 8.3x10^8 Msuns per minor merger within
the sample, consistent with minor merger stellar mass ratios.
