Analytic Approximations for the Velocity Suppression of Dark Matter Capture

Understand

Compact astrophysical objects have been considered in the literature as dark matter (DM) probes, via the observational effects of annihilating captured DM.

• In this respect, Population III (Pop III) stars are particularly interesting candidates, since they form at high redshifts, in very high DM density environments.
• It is customary to assume such a star would form roughly at the center of a DM halo, and, as such, have no rotational velocity.
• In this paper, we break from this assumption and explore the effects we can expect to observe if a Pop III star forms at some distance away from the center of the halo and thus has a non-zero rotational velocity.