NIBLES - an HI census of stellar mass selected SDSS galaxies: II.
  Arecibo follow-up HI observations
  We obtained Arecibo HI line follow-up observations of 154 of the 2600
galaxies in the Nan\c{c}ay Interstellar Baryons Legacy Extragalactic Survey
(NIBLES) sample. These observations are on average four times more sensitive
than the original observations at the Nan\c{c}ay Radio Telescope. The main goal
of this survey is to characterize the underlying HI properties of the NIBLES
galaxies which were undetected or marginally detected at Nan\c{c}ay. Of the
Nan\c{c}ay non-detections, 85% were either clearly or marginally detected at
Arecibo, while 89% of the Nan\c{c}ay marginal detections were clearly detected.
Based on the statistics of the detections relative to g-i color and r-band
luminosity (L$_r$) distribution among our Arecibo observations, we anticipate
~60% of our 867 Nan\c{c}ay non-detections and marginal detections could be
detected at the sensitivity of our Arecibo observations. Follow-up observations
of our low luminosity (L$_r$ < 10$^{8.5}$ L$_{\odot}$) blue sources indicate
that they have, on average, more concentrated stellar mass distributions than
the Nan\c{c}ay detections in the same luminosity range, suggesting we may be
probing galaxies with intrinsically different properties. These follow-up
observations enable us to probe HI mass fractions, log($M_{\rm
HI}$/$M_{\star}$) 0.5 dex and 1 dex lower, on average, than the NIBLES and
ALFALFA surveys respectively.
