Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Satellite Alignment: III. Satellite Galaxies Spatial Distribution and
  their Dependence on Redshift with A Novel Galaxy Finder   After extensively explored, broad agreement between observations and theories
has been reached that satellites are preferentially aligned with major axes of
their host centrals. There are still some issues unsolved on this topic. In
this paper, we present studies on satellite spatial distribution. To fairly
compare with observations, we develop a novel galaxy finder and reconstruction
algorithm in hydrodynamical simulation, which is based on the projected mock
image, taking into account the full consideration of the point spread function,
pixel size, surface brightness limit, resolution and redshift dimming effects.
With galaxy samples constructed using such an algorithm, the satellite
alignment is examined by comparing with observational results. It is found that
the observational alignment can be reproduced for red galaxies, which dominate
the sample in this study, but not for blue galaxies. Satellites' radial
distribution is also investigated. It exhibits that outer satellites within
host halos show stronger alignment signal than satellites in the inner regions,
especially for red satellites, which is in contrast with previous studies. The
disagreement is mainly due to extra galaxies identified by our new galaxy
finder, which are mainly located in the inner region of host halos. Our study
illustrates that at lower redshift, the alignment strength becomes stronger,
while radial distribution curve becomes flatter. This suggests differences in
the evolution of the angular distribution between satellites residing in the
inner and outer halos, and implies that the post-infall evolution reduces the
original alignment signal, that the impact decreases for satellites with later
infall times.

27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph