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Galaxies, Volume 7, Issue 3 (September 2019)
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Cover Story (view full-size image) Dark matter structures are believed to form hierarchically and, therefore, larger halos host lots [...] Read more. Dark matter structures are believed to form hierarchically and, therefore, larger halos host lots of smaller subhalos, making the halo density profiles clumpy. This will “boost” the signatures of possible dark matter annihilation, such as gamma rays. Estimating this subhalo boost factor—defined as the ratio of total luminosity due to the subhalos to that due to the smooth main component—is challenging as one needs to include the effects from all the subhalos, whose masses range over more than twenty orders of magnitude. We review the recent progress made in the literature on this topic by covering approaches based on cosmological N-body simulations and semi-analytical modeling. Although the estimates of the boost factor range quite widely, the more recent examples tend to give modest values in the order of 1–10. View this paper.