Probing dark matter streams with CoGeNT

Details Probing dark matter streams with CoGeNT Probing dark matter streams with CoGeNT

2011-08-31

arxiv.org/abs/1109.0014v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Main conclusions unchanged. Discussion on CoGeNT annual modulation included. Manuscript expanded and citations added. Accepted

Scientific paper

We examine the future sensitivity of CoGeNT to the presence of dark matter streams and find that consideration of streams in the data may lead to differences in the interpretation of the results. We show the allowed particle mass and cross section for different halo parameters, assuming spin-independent elastic scattering. As an example, we choose a stream with the same velocity profile as that of the Sagittarius stream (and in the Solar neighborhood) and find that, with an exposure of $\sim$ 10 kg year, the CoGeNT results can be expected to exclude the SHM-only halo in favor of an SHM+stream halo at the 95% (99.7%) confidence level provided the stream contributes 3% (5%) of the local dark matter density. The presence of a significant stream component may result in incorrect estimates of the particle mass and cross section unless the presence of the stream is taken into account. We conclude that the CoGeNT experiment is sensitive to streams and care should be taken to include the possibility of streams when analyzing experimental results.

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