The Next Generation Fornax Survey (NGFS): III. Revealing the Spatial Substructure of the Dwarf Galaxy Population inside half of Fornax's Virial Radius

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We report the discovery of 271 previously undetected dwarf galaxies in the outer Fornax cluster regions at radii $r_{\rm vir}/4<\!r\!<r_{\rm vir}/2$ using data from the Next Generation Fornax Survey (NGFS) with deep coadded $u'$, $g'$ and $i'$ images obtained with Blanco/DECam at Cerro Tololo Interamerican Observatory.

• From the 271 dwarf candidates we find 39 to be nucleated.
• Together with our previous study of the central Fornax region, the new dwarfs detected with NGFS data are 392, of which 56 are nucleated.
• The total Fornax dwarf galaxy population from NGFS and other catalogs rises, therefore, to a total of 643 with 181 being nucleated, yielding an overall nucleation fraction of $28\%$.