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The Formation of Isolated Ultra-Diffuse Galaxies in Romulus25 | | Anna C. Wright
; Michael Tremmel
; Alyson M. Brooks
; Ferah Munshi
; Daisuke Nagai
; Ray S. Sharma
; Thomas R. Quinn
; | | Date: |
15 May 2020 | | Abstract: | We use the Romulus25 cosmological simulation volume to identify the
largest-ever simulated sample of field ultra-diffuse galaxies (UDGs). At z=0,
we find that isolated UDGs have average star formation rates, colors, and
virial masses for their stellar masses and environment. Although they tend to
have slightly elevated HI masses, UDGs are consistent with the general isolated
dwarf galaxy population and make up ~20% of all field galaxies with
10$^7$<M$_star$/M$_odot$<10$^{9}$. The properties of our UDGs are consistent
with existing observations of field UDGs, but we predict that many isolated
UDGs have been missed by current surveys. Despite their isolation at z=0, the
UDGs in our sample are the products of major mergers at z>1. Mergers are no
more common in UDG than non-UDG progenitors, but mergers that create UDGs tend
to happen earlier, produce a temporary boost in spin, and cause star formation
to migrate to the outskirts of galaxies, resulting in lower central star
formation rates. The centers of the galaxies fade as their central stellar
populations age, but their global star formation rates are maintained through
bursts of star formation at larger radii. This formation channel is unique
relative to other proposals for UDG formation in isolated galaxies, or for UDGs
in groups and clusters, demonstrating that UDGs can potentially be formed
through multiple mechanisms. | | Source: | arXiv, 2005.7634 | | Services: | Forum | Review | PDF | Favorites | |
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