The JCMT Nearby Galaxies Legacy Survey -- XI. -- Environmental
  Variations in the Atomic and Molecular Gas Radial Profiles of Nearby Spiral
  Galaxies
  We present an analysis of the radial profiles of a sample of 43 HI-flux
selected spiral galaxies from the Nearby Galaxies Legacy Survey (NGLS) with
resolved James Clerk Maxwell Telescope (JCMT) CO $J=3-2$ and/or Very Large
Array (VLA) HI maps. Comparing the Virgo and non-Virgo populations, we confirm
that the HI disks are truncated in the Virgo sample, even for these relatively
HI-rich galaxies. On the other hand, the H$_{2}$ distribution is enhanced for
Virgo galaxies near their centres, resulting in higher H$_{2}$ to HI ratios and
steeper H$_{2}$ and total gas radial profiles. This is likely due to the
effects of moderate ram pressure stripping in the cluster environment, which
would preferentially remove low density gas in the outskirts while enhancing
higher density gas near the centre. Combined with H$\alpha$ star formation rate
data, we find that the star formation efficiency (SFR/H$_{2}$) is relatively
constant with radius for both samples, but Virgo galaxies have a $\sim40\%$
lower star formation efficiency than non-Virgo galaxies.
