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Observing nearby galaxies with submillimeter telescopes on the ground has twomajor challenges. First, the brightness is significantly reduced at longsubmillimeter wavelengths compared to the brightness at the peak of the dustemission. Second, it is necessary to use a high-pass spatial filter to removeatmospheric noise on large angular scales, which has the unwelcome by-productof also removing the galaxy's large-scale structure. We have developed atechnique for producing high-resolution submillimeter images of galaxies oflarge angular size by using the telescope on the ground to determine thesmall-scale structure (the large Fourier components) and a space telescope(Herschel or Planck) to determine the large-scale structure (the small Fouriercomponents). Using this technique, we are carrying out the HARP and SCUBA-2High Resolution Terahertz Andromeda Galaxy Survey (HASHTAG), an internationalLarge Program on the James Clerk Maxwell Telescope, with one aim being toproduce the first high-fidelity high-resolution submillimeter images ofAndromeda. In this paper, we describe the survey, the method we have developedfor combining the space-based and ground-based data, and present the firstHASHTAG images of Andromeda at 450 and 850um. We also have created a method topredict the CO(J=3-2) line flux across M31, which contaminates the 850um band.We find that while normally the contamination is below our sensitivity limit,the contamination can be significant (up to 28%) in a few of the brightestregions of the 10 kpc ring. We therefore also provide images with the predictedline emission removed.

The HASHTAG project: The First Submillimeter Images of the Andromeda Galaxy from the Ground