The ALPINE-ALMA [CII] Survey: data processing, catalogs, and statistical
  source properties
  The ALPINE-ALMA large program targets the [CII] 158 $\mu$m line and the
far-infrared continuum in 118 spectroscopically confirmed star-forming galaxies
between z=4.4 and z=5.9. It represents the first large [CII] statistical sample
built in this redshift range. We present details of the data processing and the
construction of the catalogs. We detected 23 of our targets in the continuum.
To derive accurate infrared luminosities and obscured star formation rates, we
measured the conversion factor from the ALMA 158 $\mu$m rest-frame dust
continuum luminosity to the total infrared luminosity (L$_{\rm IR}$) after
constraining the dust spectral energy distribution by stacking a photometric
sample similar to ALPINE in ancillary single-dish far-infrared data. We found
that our continuum detections have a median L$_{\rm IR}$ of 4.4$\times 10^{11}$
L$_\odot$. We also detected 57 additional continuum sources in our ALMA
pointings. They are at lower redshift than the ALPINE targets, with a mean
photometric redshift of 2.5$\pm$0.2. We measured the 850 $\mu$m number counts
between 0.35 and 3.5 mJy, improving the current interferometric constraints in
this flux density range. We found a slope break in the number counts around 3
mJy with a shallower slope below this value. More than 40 % of the cosmic
infrared background is emitted by sources brighter than 0.35 mJy. Finally, we
detected the [CII] line in 75 of our targets. Their median [CII] luminosity is
4.8$\times$10$^8$ L$_\odot$ and their median full width at half maximum is 252
km/s. After measuring the mean obscured SFR in various [CII] luminosity bins by
stacking ALPINE continuum data, we find a good agreement between our data and
the local and predicted SFR-L$_{\rm [CII]}$ relations of De Looze et al. (2014)
and Lagache et al. (2018).
