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Wide, deep, blind continuum surveys at submillimetre/millimetre (submm/mm)wavelengths are required to provide a full inventory of the dusty, distantUniverse. However, conducting such surveys to the necessary depth, withsub-arcsec angular resolution, is prohibitively time-consuming, even for themost advanced submm/mm telescopes. Here, we report the most recent results fromthe ALMACAL project, which exploits the 'free' calibration data from theAtacama Large Millimetre/submillimetre Array (ALMA) to map the lines of sighttowards and beyond the ALMA calibrators. ALMACAL has now covered 1,001calibrators, with a total sky coverage around 0.3 deg2, distributed across thesky accessible from the Atacama desert, and has accumulated more than 1,000h ofintegration. The depth reached by combining multiple visits to each field makesALMACAL capable of searching for faint, dusty, star-forming galaxies (DSFGs),with detections at multiple frequencies to constrain the emission mechanism.Based on the most up-to-date ALMACAL database, we report the detection of 186DSFGs with flux densities down to S870um ~ 0.2mJy, comparable with existingALMA large surveys but less susceptible to cosmic variance. We report thenumber counts at five wavelengths between 870um and 3mm, in ALMA bands 3, 4, 5,6 and 7, providing a benchmark for models of galaxy formation and evolution. Byintegrating the observed number counts and the best-fitting functions, we alsopresent the resolved fraction of the cosmic infrared background (CIB) and theCIB spectral shape. Combining existing surveys, ALMA has currently resolvedabout half of the CIB in the submm/mm regime.

ALMACAL IX: multi-band ALMA survey for dusty star-forming galaxies and the resolved fractions of the cosmic infrared background