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IDM2008 - Identification of Dark Matter 2008
IDM2008 - Identification of Dark Matter 2008
18-22 August 2008 AlbaNova
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A dark matter disk in the Milky Way (15'+5')
 
Predictions for the distribution of dark matter at the solar neighbourhood have 
so far modelled only the dark 
matter component. We show that the Milky Way stellar disc radically alters the 
expected phase space distribution 
of dark matter in the solar neighbourhood. Massive satellites that merge at 
redshift z~1 are preferentially dragged 
into the plane of the disc, depositing a thick disc of dark matter that is 0.25 – 1 
times the density of the 
spheroidal dark matter halo. At the same time a thick disc of stars is deposited 
that matches that seen in our own 
Galaxy, but is less massive. The stellar thick disc is a real boon because it shares 
very similar kinematics to the 
dark disc, allowing us to infer quite accurately the rotational velocity and 
velocity dispersion of the dark disc at the 
solar neighbourhood (under the assumption that most of the thick disc was 
accreted). Although most likely less 
dense that the spheroidal dark matter, the dark disc is nonetheless important 
for calculating the expected flux of 
dark matter through the Earth because it co-rotates with the Earth with low 
rotation lag (~50km/s). We discuss 
the importance of the dark disc for future dark matter direct detection 
experiments and for estimating the 
capture rate of WIMPs in the Sun and Earth.
 
Id: 386
Place: AlbaNova
Room: Oskar Klein auditorium
Starting date:
20-Aug-2008   14:10
Duration: 20'
Contribution type: Talk
Primary Authors: Dr. READ, Justin (University of Zürich)
Presenters: Dr. READ, Justin
Material: slide Slides
 
Included in session: Dark matter cosmology / structure formation
Included in track: Dark matter cosmology / structure formation
 

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