The effect of feedback on the emission properties of the Warm-Hot Intergalactic Medium

Abstract

At present, 30-40 per cent of the baryons in the local Universe is still undetected. According to theoretical predictions, this gas should reside in filaments filling the large-scale structure (LSS) in the form of a Warm-Hot Intergalactic Medium (WHIM), at temperatures of 10^5 - 10^7 K, thus emitting in the soft X-ray energies via free-free interaction and line emission from heavy elements. In this work we characterize the properties of the X-ray emission of the WHIM, and the LSS in general, focusing on the influence of different physical mechanisms, namely galactic winds (GWs), black-hole feedback and star-formation, and providing estimates of possible observational constraints. To this purpose we use a set of cosmological hydrodynamical simulations that include a self-consistent treatment of star-formation and chemical enrichment of the intergalactic medium, that allows us to follow the evolution of different metal species. We construct a set of simulated light-cones to make predictions of the emission in the 0.3-10 keV energy range. We obtain that GWs increase by a factor of 2 the emission of both galaxy clusters and WHIM. The amount of oxygen at average temperature and, consequently, the amount of expected bright Ovii and Oviii lines is increased by a factor of 3 due to GWs and by 20 per cent when assuming a top-heavy IMF. We compare our results with current observational constraints and find that the emission from faint groups and WHIM should account from half to all of the unresolved X-ray background in the 1-2 keV band.

15 pages, 8 figures, 4 tables. Accepted for publication in the MNRAS. Minor changes after referee report

References in corpus (15)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Cosmological Simulations of Intergalactic Medium Enrichment from Galactic Outflows
• Chemical enrichment of galaxy clusters from hydrodynamical simulations
• The Search for the Missing Baryons at Low Redshift
• A High-Resolution Survey of Low-Redshift QSO Absorption Lines: Statistics and Physical Conditions of O VI Absorbers
• The Low-z Intergalactic Medium. III. HI and Metal Absorbers at z<0.4
• Detection of hot gas in the filament connecting the clusters of galaxies Abell 222 and Abell 223
• Chemical enrichment in the cluster of galaxies Hydra A
• On the Putative Detection of z>0 X-ray Absorption Features in the Spectrum of Markarian 421
• The Sunyaev-Zel'dovich effects from a cosmological hydrodynamical simulation: large-scale properties and correlation with the soft X-ray signal
• Warm-Hot Intergalactic Medium Associated with the Coma Cluster
• Studying the Warm-Hot Intergalactic Medium in Emission
• Effect of the Metallicity on the X-ray Emission from the Warm-Hot Intergalactic Medium
• Expected properties of the Two-Point Autocorrelation Function of the IGM
• A High-Metallicity High Velocity Cloud along the MRK 421 Sight Line: A Tracer of Complex M?

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