Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Growth and Structure of Dark Matter Haloes   In this paper, we analyse in detail the mass-accretion histories and
structural properties of dark haloes in high-resolution N-body simulations.
Modeling the density distribution in individual haloes with the NFW profile, we
find, for all main progenitors of a given halo, there is a tight correlation
between its inner scale radius $r_s$ and the mass within it, $M_s$, which is
the basic reason why halo structural properties are closely related to their
mass-accretion histories. This correlation can be used to predict accurately
the structural properties of a dark halo at any time from its mass-accretion
history. We also test our model with a large sample of GIF haloes. The build-up
of dark haloes in CDM models generally consists of an early phase of fast
accretion and a late phase of slow accretion [where $M_h$ increases with time
approximately as the expansion rate]. These two phases are separated at a time
when the halo concentration parameter $c\sim 4$. Haloes in the two accretion
phases show systematically different properties, for example, the circular
velocity $v_h$ increases rapidly with time in the fast accretion phase but
remain almost constant in the slow accretion phase,the inner properties of a
halo, such as $r_s$ and $M_s$ increase rapidly with time in the fast accretion
phase but change only slowly in the slow accretion phase. The potential well
associated with a halo is built up mainly in the fast accretion phase, even
though a large amount of mass (over 10 times) can be accreted in the slow
accretion phase. We discuss our results in connection to the formation of dark
haloes and galaxies in hierarchical models.

36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex