Haonan Zheng, Shihong Liao, Liang Gao, Fangzhou Jiang,

| Summary:

[[{“value”:”We use the highest-resolution EAGLE simulation, Recal-L025N0752, to study the
properties and formation of ultra-diffuse galaxies (UDGs). We identify 181 UDGs
and find their properties closely match observations. The total masses of EAGLE
UDGs range from ${sim}5times 10^{8}~M_{odot}$ to ${sim}2times
10^{11}~M_{odot}$, indicating that they are dwarf galaxies rather than failed
$L_star$ galaxies. EAGLE UDGs are not a distinct population, but rather a
subset of dwarf galaxies, as their properties generally form a continuous
distribution with those of normal dwarf galaxies. Unlike the situations in
previous studies, the extended sizes of field UDGs in EAGLE are not driven by
high halos spin or by supernova-induced stellar expansion, but instead largely
arise from high spins in their star-forming gas and thus the newly formed stars
at large radii. This might be attributed to galactic fountains, by which
star-forming gas are launched to large halo-centric distances and acquire
additional angular momentum through interactions with the circumgalactic
medium.For satellite UDGs, ${sim} 60 %$ of them were already UDGs before
falling into the host galaxy, while the remaining ${sim} 40%$ were normal
galaxies prior to infall and subsequently transformed into UDGs due to tidal
effects after infall.”}]] 

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