Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dwarfs in the Milky Way halo outer rim: first in-fall or backsplash
  satellites?   Leo T is a gas-rich dwarf located at 414kpc $(1.4R_{\rm vir})$ distance from
the Milky Way (MW) and it is currently assumed to be on its first approach.
Here, we present an analysis of orbits calculated backward in time for the
dwarf with our new code {\sc delorean}, exploring a range of systematic
uncertainties, e.g. MW virial mass and accretion, M31 potential, and cosmic
expansion. We discover that orbits with tangential velocities in the Galactic
Standard-of-Rest frame lower than $|\vec{u}_{\rm t}^{\rm GSR}|\!\leq\!
63^{+47}_{-39}{\rm\, km\, s^{-1}}$ result in backsplash solutions, i.e. orbits
that entered and left the MW dark matter halo in the past, and that velocities
above $|\vec{u}_{\rm t}^{\rm GSR}|\!\geq\!21^{+33}_{-21}{\rm\, km\, s^{-1}}$
result in wide orbit backsplash solutions with a minimum pericenter range of
$D_{\rm min}\!\geq\!38^{+26}_{-16}{\rm \,kpc}$, which would allow this
satellite to survive gas stripping and tidal disruption. Moreover, new proper
motion estimates match with our region of backsplash solutions. We applied our
method to other distant MW satellites, finding a range of gas stripped
backsplash solutions for the gas-less Cetus and Eridanus II, providing a
possible explanation for their lack of cold gas, while only first in-fall
solutions are found for the HI rich Phoenix I. We also find that the cosmic
expansion can delay their first pericenter passage when compared to the
non-expanding scenario. This study explores the provenance of these distant
dwarfs and provides constraints on the environmental and internal processes
that shaped their evolution and current properties.

28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex