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

Yasna Ordenes-Briceño, Paul Eigenthaler, Matthew A. Taylor, Thomas H. Puzia, Karla Alamo-Martínez, Karen X. Ribbeck, Roberto P. Muñoz, Hongxin Zhang, Eva K. Grebel, Simón Ángel, Patrick Côté, Laura Ferrarese (+6 others)
2018 Astrophysical Journal  

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2018 pre-print
arXiv:1803.10784v1 fatcat:br2ww5a3vvd6hf3ddxh2f5xm5q
We report the discovery of 271 previously undetected dwarf galaxies in the outer Fornax cluster regions at radii r_ vir/4<r<r_ 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
more » ... otal 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%. The absolute i'-band magnitudes for the outer NGFS dwarfs are in the range -18.80< M_i'< -8.78 with effective radii r_ eff,i' = 0.18-2.22 kpc and an average Sersic index 〈 n〉_i' = 0.81. Non-nucleated dwarfs are found to be fainter and smaller by Δ〈 M_i'〉=2.25 mag and Δ〈 r_ eff,i'〉=0.4 kpc than the nucleated dwarfs. We demonstrate a significant clustering of dwarf galaxies on scales ≲100 kpc, and projected surface number density profile estimates, Σ_N(r), show a concentration of dwarfs in the Fornax core region within r∼350 kpc. Σ_N(r) has a flat distribution up to ∼350 kpc, beyond which it declines for the non-nucleated dwarfs. The nucleated dwarfs have a steeper Σ_N(r) distribution, being more concentrated towards NGC 1399 and decreasing rapidly outwards. This is the first time the transition from cluster to field environment has been established for the very faint dwarf galaxy population with robust sample statistics.
doi:10.3847/1538-4357/aaba70 fatcat:f7c5vfi4cvhxxnjqi5j3yksp6i
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Yasna Ordenes-Briceño, Paul Eigenthaler, Matthew A. Taylor, Thomas H. Puzia, Karla Alamo-Martínez, Karen X. Ribbeck, Roberto P. Muñoz, Hongxin Zhang, Eva K. Grebel, Simón Ángel, Patrick Côté, Laura Ferrarese, Michael Hilker, Ariane Lançon, Steffen Mieske, Bryan W. Miller, Yu Rong, Ruben Sánchez-Janssen. "The Next Generation Fornax Survey (NGFS). III. Revealing the Spatial Substructure of the Dwarf Galaxy Population Inside Half of Fornax's Virial Radius." Astrophysical Journal 859.1 (2018) 52