2012ApJ...748...20C -
Astrophys. J., 748, 20 (2012/March-3)
Dark matter sub-halo counts via star stream crossings.
CARLBERG R.G.
Abstract (from CDS):
Dark matter sub-halos create gaps in the stellar streams orbiting in the halos of galaxies. We evaluate the sub-halo stream crossing integral with the guidance of simulations to find that the linear rate of gap creation, R∪, in a typical cold dark matter (CDM) galactic halo at 100 kpc is R∪≃ 0.006618–0.35/kpc, where 18 (≡1/108M☉) is the minimum mass halo that creates a visible gap. The relation can be recast entirely in terms of observables, as R∪≃ 0.059ω–0.85/kpc/Gyr, for w in kpc, normalized at 100 kpc. Using published data, the density of gaps is estimated for M31's NW stream and the Milky Way Pal 5 stream, Orphan stream, and Eastern Banded Structure. The estimated rates of gap creation all have errors of 50% or more due to uncertain dynamical ages and the relatively noisy stream density measurements. The gap-rate-width data are in good agreement with the CDM-predicted relation. The high density of gaps in the narrow streams requires a total halo population of 105 sub-halos above a minimum mass of 105 M☉.
Abstract Copyright:
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Journal keyword(s):
dark matter - galaxies: dwarf - Local Group
Simbad objects:
4
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