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Halo density profiles and baryon physics

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Abstract

The radial dependence of the pseudo phase-space density, ρ(r)/σ 3(r) is studied. We find that the pseudo phase-space density for halos consisting both of dark matter and baryons is approximately a power-law only down to 0.1% of the virial radius while it has a non-power law behavior below the quoted scale, with inner profiles changing with mass. Halos consisting just of dark matter, as the one in dark matter only simulations, are characterized by an approximately power-law behavior. The results argue against universality of the pseudo phase-space density, when the baryons effect are included, and as a consequence argue against universality of density profiles constituted by dark matter and baryons as also discussed in [1].

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Authors and Affiliations

  1. Institute of Modern Physics, Chinese Academy of Sciences, Post Office Box 31, Lanzhou, 730000, People’s Republic of China

    A. Del Popolo & Xi-Guo Li

  2. Dipartimento di Fisica e Astronomia, Universitá di Catania, Viale Andrea Doria 6, 95125, Catania, Italy

    A. Del Popolo

  3. INFN, Sezione di Catania, Via Santa Sofia 64, 95123, Catania, Italy

    A. Del Popolo

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Del Popolo, A., Li, XG. Halo density profiles and baryon physics. Astron. Rep. 61, 631–638 (2017). https://doi.org/10.1134/S1063772917080029

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