SHARC-II Mapping ofSpitzerc2d Small Clouds and Cores

We present the results of a submillimeter survey of 53 low-mass dense coreswith the Submillimeter High Angular Resolution Camera II (SHARC-II). The surveyis a follow-up project to the Spitzer Legacy Program ``From Molecular Cores toPlanet-Forming Disks'', with the purpose being to create a complete data set ofnearby low-mass dense cores from the infrared to the millimeter. We presentmaps of 52 cores at 350 microns and three cores at 450 microns, two of whichwere observed at both wavelengths. Of these 52 cores, 41 were detected bySHARC-II: 32 contained one submillimeter source while 9 contained multiplesources. For each submillimeter source detected, we report various sourceproperties including source position, fluxes in various apertures, size, aspectratio, and position angle. For the 12 cores that were not detected we presentupper limits. The sources detected by SHARC-II have, on average, smaller sizesat the 2sigma contours than those derived from longer-wavelength bolometerobservations. We conclude that this is not caused by a failure to integratelong enough to detect the full extent of the core; instead it arises primarilyfrom the fact that the observations presented in this survey are insensitive tosmoothly varying extended emission. We find that SHARC-II observations oflow-mass cores are much better suited to distinguishing between starless andprotostellar cores than observations at longer wavelengths. Very Low LuminosityObjects, a new class of objects being discovered by the Spitzer Space Telescopein cores previously classified as starless, look very similar at 350 microns toother cores with more luminous protostars.