pith. machine review for the scientific record. sign in

arxiv: astro-ph/0505473 · v1 · submitted 2005-05-23 · 🌌 astro-ph

Recognition: unknown

The History of the Baryon Budget: Cosmic Logistics in a Hierarchical Universe

Authors on Pith no claims yet
classification 🌌 astro-ph
keywords modelbaryonomegaanalyticalbudgetformationpredictionssimulations
0
0 comments X
read the original abstract

Using a series of high-resolution N-body hydrodynamical numerical simulations, we investigate several scenarios for the evolution of the baryon budget in galactic halos. We derive individual halo star formation history (SFH), as well as the global star formation rate in the universe. We develop a simple analytical model that allows us to compute surprisingly accurate predictions, when compared to our simulations, but also to other simulations presented in Springel & Hernquist (2003). The model depends on two main parameters: the star formation time scale t* and the wind efficiency eta_w. We also compute, for halos of a given mass, the baryon fraction in each of the following phases: cold disc gas, hot halo gas and stars. Here again, our analytical model predictions are in good agreement with simulation results, if one correctly takes into account finite resolution effect. We compare predictions of our analytical model to several observational constraints, and conclude that a very narrow range of the model parameters is allowed. The important role played by galactic winds is outlined, as well as a possible `superwind' scenario in groups and clusters. The `anti-hierarchical' behavior of observed SFH is well reproduced by our best model with t*=3Gyr and eta_w=1.5. We obtain in this case a present-day cosmic baryon budget of Omega*= 0.004, Omega_cold=0.0004, Omega_hot=0.01 and Omega_back=0.02 (diffuse background).

This paper has not been read by Pith yet.

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Forward citations

Cited by 1 Pith paper

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

  1. One Merge to Rule Them All: From Galaxy Interactions to Black Hole Mergers Using Horizon-AGN

    astro-ph.GA 2026-05 unverdicted novelty 5.0

    Horizon-AGN shows galaxy and black hole merger rates both rise with stellar mass and fall with redshift, peaking near z=2-3, establishing a direct evolutionary link from galaxy interactions to black hole coalescences.