Semi-analytical frameworks for subhaloes from the smallest to the largest scale

• DOI: 10.1093/mnras/stac2857
• Publication Date: 2022-10-08T12:26:07Z
• Authors: Nagisa Hiroshima; Shin’ichiro Ando; Tomoaki Ishiyama
• Keywords: Cosmology and Nongalactic Astrophysics (astro-ph.CO); 0103 physical sciences; FOS: Physical sciences; 530; 01 natural sciences; Astrophysics - Cosmology and Nongalactic Astrophysics

Substructures of dark matter halo, called subhalos, provide important clues to understand the nature matter. We construct a useful model describe properties subhalo mass functions based on well-known analytical prescriptions, extended Press-Schechter theory. The unevolved at arbitrary scales become describable without introducing free parameters. different host halo evolution histories are directly recast their functions. As applications, we quantify effects from (i) Poisson fluctuation, (ii) scatter, and (iii) tidal models observables in current Universe with this scheme. fluctuation dominates number count ratio $\sim {\cal O}(10^{-2})$, where intrinsic scatter is smaller by factor few. host-mass around its mean does not affect function. Different predict $\sim2$ difference numbers subhalos $\lesssim O}(10^{-5})$, while dependence subtle. scheme provides new tool for investigating smallest-scale structures our which be observed near future experiments.