Observation and calibration strategies for large-scale multi-beam
  velocity-resolved mapping of the [CII] emission in the Orion molecular cloud
  Context. The [CII] 158micron far-infrared fine-structure line is one of the
dominant cooling lines of the star-forming interstellar medium (ISM). Hence
[CII] emission originates in and thus can be used to trace a range of ISM
processes. Velocity-resolved large-scale mapping of [CII] in star-forming
regions provides a unique perspective of the kinematics of these regions and
their interactions with the exciting source of radiation.
  Aims. We explore the scientific applications of large-scale mapping of
velocity-resolved [CII] observations. With the [CII] observations, we
investigate the effect of stellar feedback on the ISM. We present the details
of observation, calibration, and data reduction using a heterodyne array
receiver mounted on an airborne observatory.
  Results. A square-degree [CII] map with a spectral resolution of 0.3 km/s is
presented. The scientific potential of this data is summarized with discussion
of mechanical and radiative stellar feedback, filament tracing using [CII],
[CII] opacity effects, [CII] and carbon recombination lines, and [CII]
interaction with the large molecular cloud. The data quality and calibration is
discussed in detail, and new techniques are presented to mitigate the effects
of unavoidable instrument deficiencies (e.g. baseline stability) and thus to
improve the data quality. A comparison with a smaller [CII] map taken with the
Herschel/Heterodyne Instrument for the Far-Infrared (HIFI) spectrometer is
presented.
