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27 April 2024 |
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Article overview
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Selecting ultra-faint dwarf candidate progenitors in cosmological N-body simulations at high redshifts | | Mohammadtaher Safarzadeh
; Alexander P. Ji
; Gregory A. Dooley
; Anna Frebel
; Evan Scannapieco
; Facundo A. Gómez
; Brian W. O'Shea
; | | Date: |
11 Dec 2017 | | Abstract: | The smallest satellites of the Milky Way ceased forming stars during the
epoch of reionization and thus provide archaeological access to galaxy
formation at $z>6$. Numerical studies of these ultra-faint dwarf galaxies
(UFDs) require expensive cosmological simulations with high mass resolution
that are carried out down to $z=0$. However, if we are able to statistically
identify UFD host progenitors at high redshifts with relatively high
probabilities, we can avoid this high computational cost. To find such
candidates, we analyze the merger trees of Milky Way type halos from the
high-resolution Caterpillar suite of dark matter only simulations. Satellite
UFD hosts at $z=0$ are identified based on four different abundance matching
techniques. All the halos at high redshifts are traced forward in time in order
to compute the probability of surviving as satellite UFDs today. Our results
show that selecting potential UFD progenitors based solely on their mass at
z=12 (8) results in a 10\% (20\%) chance of obtaining a surviving UFD at $z=0$.
We find that the progenitors of surviving satellite UFDs have lower virial
ratios ($eta$), and are preferentially located at large distances from the
main MW progenitor, while they show no correlation with concentration
parameter. Halos with favorable locations and virial ratios are $approx 3$
times more likely to survive as satellite UFD candidates at $z=0.$ | | Source: | arXiv, 1712.3967 | | Services: | Forum | Review | PDF | Favorites | |
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