The clustering of baryonic matter. II: halo model and hydrodynamic simulations

Abstract

We recently developed a generalization of the halo model in order to describe the spatial clustering properties of each mass component in the Universe, including hot gas and stars. In this work we discuss the complementarity of the model with respect to a set of cosmological simulations including hydrodynamics of different kinds. We find that the mass fractions and density profiles measured in the simulations do not always succeed in reproducing the simulated matter power spectra, the reason being that the latter encode information from a much larger range in masses than that accessible to individually resolved structures. In other words, this halo model allows one to extract information on the growth of structures from the spatial clustering of matter, that is complementary with the information coming from the study of individual objects. We also find a number of directions for improvement of the present implementation of the model, depending on the specific application one has in mind. The most relevant one is the necessity for a scale dependence of the bias of the diffuse gas component, which will be interesting to test with future detections of the Warm-Hot Intergalactic Medium. This investigation confirms the possibility to gain information on the physics of galaxy and cluster formation by studying the clustering of mass, and our next work will consist of applying the halo model to use future high-precision cosmic shear surveys to this end.

20 pages, 9 figures. Accepted for publication on JCAP

References in corpus (5)

• Effects of Baryons and Dissipation on the Matter Power Spectrum
• The Scale Dependence of Halo and Galaxy Bias: Effects in Real Space
• Simulations of Baryon Oscillations
• Scale Dependent Galaxy Bias in the SDSS as a function of Luminosity and Colour
• Systematic effects in the sound horizon scale measurements

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• Including beyond-linear halo bias in halo models
• Constraints on $S_8$ from a full-scale and full-shape analysis of redshift-space clustering and galaxy-galaxy lensing in BOSS
• Host Dark Matter Halos of WISE-selected Obscured & Unobscured Quasars: Evidence for Evolution
• The halo model with beyond-linear halo bias: unbiasing cosmological constraints from galaxy-galaxy lensing and clustering
• Mapping luminous and dark matter in the Universe
• MIGHTEE: The dark matter haloes, duty cycle and mechanical feedback from radio-AGN up to $z\sim 2.5$
• Probing baryonic feedback with fast radio bursts: joint analyses with cosmic shear and galaxy clustering