Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relative clustering and the joint halo occupation distribution of
  red-sequence and blue-cloud galaxies in COMBO-17   This paper studies the relative spatial distribution of red-sequence and
blue-cloud galaxies, and their relation to the dark matter distribution in the
COMBO-17 survey as function of scale down to z~1. We measure the 2nd-order
auto- and cross-correlation functions of galaxy clustering and express the
relative biasing by using aperture statistics. Also estimated is the relation
between the galaxies and the dark matter distribution exploiting galaxy-galaxy
lensing (GGL). All observables are further interpreted in terms of a halo
model. To fully explain the galaxy clustering cross-correlation function with a
halo model, we need to introduce a new parameter,R, that describes the
statistical relation between numbers of red and blue galaxies within the same
halo. We find that red and blue galaxies are clearly differently clustered, a
significant evolution of the relative clustering with redshift was not found.
There is evidence for a scale-dependence of relative biasing. The relative
clustering, the GGL and, with some tension, the galaxy numbers can be explained
consistently within a halo model. For the cross-correlation function one
requires a HOD variance that becomes Poisson even for relatively small
occupancy numbers. For our sample, this rules out with high confidence a
"Poisson satellite" scenario as found in semi-analytical models. Red galaxies
have to be concentrated towards the halo centre, either by a central red galaxy
or by a concentration parameter above that for dark matter.The value of R
depends on the presence or absence of central galaxies: If no central galaxies
or only red central galaxies are allowed, R is consistent with zero, whereas a
positive correlation $R=+0.5\pm0.2$ is needed if both blue and red galaxies can
have central galaxies.[ABRIDGED]

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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: q-bio
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The categories of this paper are: physics