10. Instruments VII: HAWC+

The High-resolution Airborne Wideband Camera is a multi-wavelength far-infrared camera and imaging polarimeter with continuum bandpasses from 40 μm to 300 μm. HAWC is designed for two 64x40 bolometer arrays that simultaneously measure both orthogonal states of linear polarization. However, the current instrument includes one 64x40 array measuring the R polarization state but only one 32x40 array for the T polarization state.  With one exception, each passband is diffraction limited with pixel spacing that Nyquist samples the beam, yielding spatial resolutions of 5 to 20 arcsecond and instantaneous fields of view of 2 to 8 arcminutes. (The 63 μm band is optimized for mapping speed at the expense of sampling density.) HAWC+ can measure either total intensity only, or also polarized intensity, as determined by the usage of rotating half-wave plates.

Between the time of writing and the start of Cycle 5 observations, analysis of data obtained during the initial phase of instrument commissioning is ongoing.  The Observer's Handbook will be updated as necessary and the list of changes will be included at the beginning of the document. Critical updates will also be published on the Cycle 5 web page. Any information that supersedes what is given in this document will be explicitly indicated.

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