  A crucial aspect in addressing the challenge of measuring the core mass
function, that is pivotal for comprehending the origin of the initial mass
function, lies in constraining the temperatures of the cores. We aim to measure
the luminosity, mass, column density and dust temperature of star-forming
regions imaged by the ALMA-IMF large program. High angular resolution mapping
is required to capture the properties of protostellar and pre-stellar cores and
to effectively separate them from larger features, such as dusty filaments. We
employed the point process mapping (PPMAP) technique, enabling us to perform
spectral energy distribution fitting of far-infrared and submillimeter
observations across the 15 ALMA-IMF fields, at an unmatched 2.5" angular
resolution. By combining the modified blackbody model with near-infrared data,
we derived bolometric luminosity maps. We estimated the errors impacting values
of each pixel in the temperature, column density, and luminosity maps.
Subsequently, we employed the extraction algorithm getsf on the luminosity maps
in order to detect luminosity peaks and measure their associated masses. We
obtained high-resolution constraints on the luminosity, dust temperature, and
mass of protoclusters, that are in agreement with previously reported
measurements made at a coarser angular resolution. We find that the
luminosity-to-mass ratio correlates with the evolutionary stage of the studied
regions, albeit with intra-region variability. We compiled a PPMAP source
catalog of 313 luminosity peaks using getsf on the derived bolometric
luminosity maps. The PPMAP source catalog provides constraints on the mass and
luminosity of protostars and cores, although one source may encompass several
objects. Finally, we compare the estimated luminosity-to-mass ratio of PPMAP
sources with evolutionary tracks and discuss the limitations imposed by the
2.5" beam.
