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Date and Time of the Query: 2019-05-22 T06:58:13 PDT
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For refcode 2004ApJ...617L..13N:
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Copyright by American Astronomical Society. Reproduced by permission
2004ApJ...617L..13N Abundance of Substructure in Clusters of Galaxies Priyamvada Natarajan and Volker Springel Abstract. It is widely recognized that cold dark matter (CDM) models predict abundant dark matter substructure in halos of all sizes. Galaxy-galaxy lensing provides a unique opportunity to directly measure the presence and the mass of such substructures in clusters of galaxies. Here we present the mass function of substructures obtained from lensing in massive Hubble Space Telescope cluster lenses and compare it with that obtained from high-resolution cosmological N-body simulations. We find excellent agreement in the slope and amplitude in the mass range 10^11^ - 10^12.5^ M_sun_ probed by the observations, highlighting a significant success of the CDM theory. At lower mass scales, the simulations predict a large abundance of small substructures below our detection threshold with galaxy-galaxy lensing, with many of them being plausibly associated with faint cluster galaxies. Our results suggest that the CDM substructure abundance on the scale of clusters is in good agreement with present observational data. Keywords: Cosmology: Dark Matter, Gravitation, Cosmology: Gravitational Lensing, Methods: n-Body Simulations
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