PSZSPT: a joint Planck and SPT-SZ cluster catalog
  We present the first cluster catalog extracted from combined space-based
(Planck) and ground-based (South Pole Telescope; SPT-SZ) millimeter data. We
developed and applied a matched multi-filter (MMF) capable of dealing with the
different transfer functions and resolutions of the two datasets. We verified
that it produces results consistent with publications from Planck and SPT
collaborations when applied on the datasets individually. We also verified that
Planck and SPT-SZ cluster fluxes are consistent with each other. When applied
blindly to the combined dataset, the MMF generated a catalog of 419 detections
($S/N>5$), of which 323 are already part of the SPT-SZ or PSZ2 catalogs; 54 are
new SZ detections, which have been identified in other catalogs or surveys; and
42 are new unidentified candidates. The MMF takes advantage of the
complementarity of the two datasets, Planck being particularly useful for
detecting clusters at a low redshift ($z<0.3$), while SPT is efficient at
finding higher redshift ($z>0.3$) sources. This work represents a proof of
concept that blind cluster extraction can be performed on combined,
inhomogeneous millimeter datasets acquired from space and ground. This result
is of prime importance for planned ground-based cosmic microwave background
(CMB) experiments (e.g., Simons Observatory, CMB-S4) and envisaged CMB space
missions (e.g., PICO, Backlight) that will detect hundreds of thousands of
clusters in the low mass regime ($M_{500} \leqslant 10^{14} M_\odot$), for
which the various sources of intra-cluster emission (gas, dust, synchrotron)
will be of the same order of magnitude and hence require broad ground and space
frequency coverage with a comparable spatial resolution for adequate
separation.
