The S-PLUS Fornax Project (S+FP): SExtractor detection and measurement of nearby galaxies in large photometric surveys
arxiv(2024)
Abstract
All-sky multi-band photometric surveys represent a unique opportunity of
exploring rich nearby galaxy clusters up to several virial radii, reaching the
filament regions where pre-processing is expected to occur. These projects aim
to tackle a large number of astrophysical topics, encompassing both the
galactic and extragalactic fields. In that sense, generating large catalogues
with homogeneous photometry for both resolved and unresolved sources that might
be interesting to achieve specific goals, imposes a compromise when choosing
the set of parameters to automatically detect and measure such a plethora of
objects. In this work we present the acquired experience on studying the galaxy
content of the Fornax cluster using large catalogues obtained by the Southern
Photometric Local Universe Survey (S-PLUS). We realized that some Fornax bright
galaxies are missed in the S-PLUS iDR4 catalogues. In addition, Fornax
star-forming galaxies are included as multiple detections due to
over-deblending. To solve those issues, we performed specific SExtractor runs
to identify the proper set of parameters to recover as many Fornax galaxies as
possible with confident photometry and avoiding duplications. From that
process, we obtained new catalogs containing 12-band improved photometry for
3 x 10^6 resolved and unresolved sources in an area of 208 deg2 in the
direction of the Fornax cluster. Together with identifying the main
difficulties to carry out the study of nearby groups and clusters of galaxies
using S-PLUS catalogs, we also share possible solutions to face issues that
seem to be common to other ongoing photometric surveys.
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