Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Prospects for CDM sub-halo detection using high angular resolution
  observations   In the CDM scenario, dark matter halos are assembled hierarchically from
smaller subunits. A long-standing problem with this picture is that the number
of sub-halos predicted by CDM simulations is orders of magnitudes higher than
the known number of satellite galaxies in the vicinity of the Milky Way. A
plausible way out of this problem could be that the majority of these sub-halos
somehow have so far evaded detection. If such "dark galaxies" do indeed exist,
gravitational lensing may offer one of the most promising ways to detect them.
Dark matter sub-halos in the 1e6 - 1e10 solar mass range should cause strong
gravitational lensing on (sub)milliarcsecond scales. We study the feasibility
of a strong lensing detection of dark sub-halos by deriving the image
separations expected for density profiles favoured by recent simulations and
comparing these to the angular resolution of both existing and upcoming
observational facilities. We find that there is a reasonable probability to
detect sub-halo lensing effects in high resolution observations at radio
wavelengths, such as produced by the upcoming VSOP-2 satellite, and thereby
test the existence of dark galaxies.

21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas