Paper:	Counting Dark Sub-halos with Star Stream Gaps
Volume:	458, Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way
Page:	379
Authors:	Carlberg, R. G.
Abstract:	The Cold Dark Matter paradigm predicts vast numbers of dark matter sub-halos to be orbiting in galactic halos. The sub-halos are detectable through the gaps they create gaps in stellar streams. The gap-rate is an integral over the density of sub-halos, their mass function, velocity distribution and the dynamical age of the stream. The rate of visible gap creation is a function of the width of the stream. The available data for four streams: the NW stream of M31, the Pal 5 stream, the Orphan Stream and the Eastern Banded Structure, are compared to the LCDM predicted relation. We find a remarkably good agreement, although there remains much to be done to improve the quality of the result. The narrower streams require that there is a total population of order 105 sub-halos above 105 msun to create the gaps.

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