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Stellar and dark matter density in the Local Universe

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arxiv 1810.06326 v1 pith:XEER6NQE submitted 2018-10-15 astro-ph.GA astro-ph.CO

classification astro-ph.GAastro-ph.CO
keywords omegadensitymatterdarkmeangroupslocalstellar
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abstract

We calculate the mean density profiles for luminous and dark matter on distance scales $D \sim(1 - 100)$ Mpc around us using recent all-sky catalogs of galaxy groups. Within the Local Volume $( D < 11 ~\rm Mpc)$ we derived the mean stellar density $\Omega_*= 0.44\%$ in the critical density units and the mean total matter density $\Omega_m = 0.17$. In the sphere with a radius of 40 Mpc these quantities drop to $\Omega_* = 0.24 - 0.32\%$ and $\Omega_m = 0.09 - 0.14$. In a larger volume within $D\sim135$ Mpc the discussed densities become more uncertain: $\Omega_* = 0.20 - 0.24\%$ and $\Omega_m = 0.05 - 0.16$. We summarize that the major part of the cosmic dark matter locates outside the virial and collapsing zones of groups and clusters.

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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Tighter Dark Matter Constraints from the Projected Mass Method: A Neural Network Enhanced Method for Galaxy Groups and Clusters

    astro-ph.GA 2026-07 conditional novelty 5.0 of 10

    A simulation-trained neural network removes most of the systematic overestimate of the Projected Mass Estimator, yielding Milky Way, M81, and NGC 5128 halo masses in line with the literature.

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