Intensity-Corrected Herschel Observations of Nearby Isolated Low-Mass
  Clouds
  We present intensity-corrected Herschel maps at 100 um, 160 um, 250 um, 350
um, and 500 um for 56 isolated low-mass clouds. We determine the zero-point
corrections for Herschel PACS and SPIRE maps from the Herschel Science Archive
(HSA) using Planck data. Since these HSA maps are small, we cannot correct them
using typical methods. Here, we introduce a technique to measure the zero-point
corrections for small Herschel maps. We use radial profiles to identify offsets
between the observed HSA intensities and the expected intensities from Planck.
Most clouds have reliable offset measurements with this technique. In addition,
we find that roughly half of the clouds have underestimated HSA-SPIRE
intensities in their outer envelopes relative to Planck, even though the
HSA-SPIRE maps were previously zero-point corrected. Using our technique, we
produce corrected Herschel intensity maps for all 56 clouds and determine their
line-of-sight average dust temperatures and optical depths from modified black
body fits. The clouds have typical temperatures of ~ 14-20 K and optical depths
of ~ 1e-5 - 1e-3. Across the whole sample, we find an anti-correlation between
temperature and optical depth. We also find lower temperatures than what was
measured in previous Herschel studies, which subtracted out a background level
from their intensity maps to circumvent the zero-point correction. Accurate
Herschel observations of clouds are key to obtain accurate density and
temperature profiles. To make such future analyses possible,
intensity-corrected maps for all 56 clouds are publicly available in the
electronic version.
