  The Massive and Distant Clusters of WISE Survey 2 (MaDCoWS2) is a new survey
designed as the successor of the original MaDCoWS survey. MaDCoWS2 improves
upon its predecessor by using deeper optical and infrared data and a more
powerful detection algorithm (PZWav). As input to the search, we use grz
photometry from DECaLS in combination with W1 and W2 photometry from the
CatWISE2020 catalog to derive the photometric redshifts with full redshift
probability distribution functions for WISE-selected galaxies. Cluster
candidates are then detected using the PZWav algorithm to find
three-dimensional galaxy overdensities from the sky positions and photometric
redshifts. This paper provides the first MaDCoWS2 data release, covering 1461
(1838 without masking) deg^2 centered on the Hyper-SuprimeCam Subaru Strategic
Program equatorial fields. Within this region, we derive a catalog of 22,970
galaxy cluster candidates detected at S/N>5. These clusters span the redshift
range 0.1<z<2, including 1312 candidates at z>1.5. We compare MaDCoWS2 to six
existing catalogs in the area. We rediscover 60%-92% of the clusters in these
surveys at S/N>5. The medians of the absolute redshift offset are <0.02
relative to these surveys, while the standard deviations are less than 0.06.
The median offsets between the detection position from MaDCoWS2 and other
surveys are less than 0.25 Mpc. We quantify the relation between S/N and gas
mass, total mass, luminosity, and richness from other surveys using a
redshift-dependent power law relation. We find that the S/N-richness relation
exhibits the lowest scatter.
