Maps of the Southern Millimeter-wave Sky from Combined 2500 deg$^2$
  SPT-SZ and Planck Temperature Data
  We present three maps of the millimeter-wave sky created by combining data
from the South Pole Telescope (SPT) and the Planck satellite. We use data from
the SPT-SZ survey, a survey of 2540 deg$^2$ of the the sky with arcminute
resolution in three bands centered at 95, 150, and 220 GHz, and the
full-mission Planck temperature data in the 100, 143, and 217 GHz bands. A
linear combination of the SPT-SZ and Planck data is computed in spherical
harmonic space, with weights derived from the noise of both instruments. This
weighting scheme results in Planck data providing most of the
large-angular-scale information in the combined maps, with the smaller-scale
information coming from SPT-SZ data. A number of tests have been done on the
maps. We find their angular power spectra to agree very well with theoretically
predicted spectra and previously published results.
