Automated Mining of the ALMA Archive in the COSMOS Field (A3COSMOS): I.
  Robust ALMA Continuum Photometry Catalogs and Stellar Mass and Star Formation
  Properties for ~700 Galaxies at z=0.5-6
  The rich information on (sub)millimeter dust continuum emission from distant
galaxies in the public Atacama Large Millimeter/submillimeter Array (ALMA)
archive is contained in thousands of inhomogeneous observations from individual
PI-led programs. To increase the usability of these data for studies deepening
our understanding of galaxy evolution, we have developed automated mining
pipelines for the ALMA archive in the COSMOS field (A3COSMOS) that efficiently
exploit the available information for large numbers of galaxies across cosmic
time and keep the data products in sync with the increasing public ALMA
archive: (a) a dedicated ALMA continuum imaging pipeline, (b) two complementary
photometry pipelines for both blind source extraction and prior source fitting,
(c) a counterpart association pipeline utilizing the multiwavelength data
available (including quality assessment based on machine-learning techniques),
(d) an assessment of potential (sub)millimeter line contribution to the
measured ALMA continuum, and (e) extensive simulations to provide statistical
corrections to biases and uncertainties in the ALMA continuum measurements.
Application of these tools yields photometry catalogs with ~1000
(sub)millimeter detections (spurious fraction ~8%-12%) from over 1500
individual ALMA continuum images. Combined with ancillary photometric and
redshift catalogs and the above quality assessments, we provide robust
information on redshift, stellar mass, and star formation rate for ~700
galaxies at redshifts 0.5-6 in the COSMOS field (with undetermined selection
function). The ALMA photometric measurements and galaxy properties are released
publicly within our blind extraction, prior fitting, and galaxy property
catalogs, plus the images. These products will be updated on a regular basis in
the future.
