Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How did the Virgo cluster form?   While the Virgo cluster is the nearest galaxy cluster and therefore the best
observed one, little is known about its formation history. In this paper, a set
of cosmological simulations that resemble the Local Universe is used to shed
the first light on this mystery. The initial conditions for these simulations
are constrained with galaxy peculiar velocities of the second catalog of the
Cosmicflows project using algorithms developed within the Constrained Local
UniversE Simulation project. Boxes of 500 Mpc/h on a side are set to run a
series of dark matter only constrained simulations. In each simulation, a
unique dark matter halo can be reliably identified as Virgo's counterpart. The
properties of these Virgo halos are in agreement at a 10-20% level with the
global properties of the observed Virgo cluster. Their zero-velocity masses
agree at one-sigma with the observational mass estimate. In all the
simulations, the matter falls onto the Virgo objects along a preferential
direction that corresponds to the observational filament and the slowest
direction of collapse. A study of the mass accretion history of the Virgo
candidates reveals the most likely formation history of the Virgo cluster,
namely a quiet accretion over the last 7 Gigayears.

27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an