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In the cold dark matter paradigm, structures form hierarchically, implyingthat large structures contain smaller substructures. These subhalos willenhance signatures of dark matter annihilation such as gamma rays. In theliterature, typical estimates of this boost factor assume a concentration-massrelation for field halos, to calculate the luminosity of subhalos. However,since subhalos accreted in the gravitational potential of their host loose massthrough tidal stripping and dynamical friction, they have a quitecharacteristic density profile, different from that of the field halos of thesame mass. In this work, we quantify the effect of tidal stripping on the boostfactor, by developing a semi-analytic model that combines mass-accretionhistory of both the host and subhalos as well as subhalo accretion rates. Wefind that when subhalo luminosities are treated consistently, the boost factorincreases by a factor 2-5, compared to the typical calculation assuming afield-halo concentration. This holds for host halos ranging from sub-galaxy tocluster masses and is independent of the subhalo mass function or specificconcentration-mass relation. The results are particularly relevant for indirectdark matter searches in the extragalactic gamma-ray sky.

Boosting the annihilation boost: Tidal effects on dark matter subhalos and consistent luminosity modeling