Non-equilibrium Ionization State of Warm-Hot Intergalactic Medium

Abstract

Time evolution of the ionization state of metals in the cosmic baryons is investigated in a cosmological context without the assumption of ionization equilibrium. We find that a significant fraction of ionized oxygen ions (OVII and OVIII) in the warm-hot intergalactic medium (WHIM) is not in the ionization equilibrium state at a redshift of z~0. We also investigate the effect on the detectability and observables of WHIM as a consequence of such deviation from ionization equilibrium. It is found that the detectability of WHIM is not altered very much both through its emission and absorption signatures, but line ratios between OVII and OVIII are significantly different from those in the ionization equilibrium state.

25 pages, 18 figures, accepted for publication in PASJ

Cited by in corpus (31)

• 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
• Bimodality of low-redshift circumgalactic O VI in non-equilibrium EAGLE zoom simulations
• Non-Equilibirum ionisation and cooling of metal-enriched gas in the presence of a photo-ionisation background
• Outskirts of Galaxy Clusters
• The Nature of the Warm/Hot Intergalactic Medium I. Numerical Methods, Convergence, and OVI Absorption
• Shock fronts, electron-ion equilibration and ICM transport processes in the merging cluster Abell 2146
• Non-Equilibrium Electrons and the Sunyaev-Zel'dovich Effect of Galaxy Clusters
• Nonequilibrium ionization states and cooling rates of the photoionized enriched gas
• Hydrodynamic Simulations of Merging Galaxy Clusters: Non-Equilibrium Ionization State and Two-Temperature Structure
• Detection of the Missing Baryons toward the Sightline of H1821+643
• Metal-line emission from the warm-hot intergalactic medium: I. Soft X-rays
• Confirming the Detection of an Intergalactic X-ray Absorber Toward PKS 2155-304
• Studying the WHIM with Gamma Ray Bursts
• The abundance and physical properties of O VII and O VIII X-ray absorption systems in the EAGLE simulations
• Numerical simulations of the Warm-Hot Intergalactic Medium
• Metal-line emission from the warm-hot intergalactic medium: II. Ultraviolet
• Soft X-ray and extreme ultraviolet excess emission from clusters of galaxies
• X-ray emission from warm-hot intergalactic medium: the role of resonantly scattered cosmic X-ray background
• Rest-frame UV line emission from the intergalactic medium at 2<z<5
• How the diffuse Universe cools
• ARGOT: Accelerated radiative transfer on grids using oct-tree
• Non-Equilibrium Ionization State and Two-Temperature Structure in the Linked Region of Abell 399/401
• X-ray surface brightness and gas density profiles of galaxy clusters up to 3*R500c with SRG/eROSITA
• Effect of the Metallicity on the X-ray Emission from the Warm-Hot Intergalactic Medium
• Non-Equilibrium Ionization State and Two-Temperature Structure in the Bullet Cluster 1E0657-56
• Prospects of detecting soft X-ray emission from typical WHIM filaments around massive clusters and the Coma cluster soft excess
• X-ray Signatures of Non-Equilibrium Ionization Effects in Galaxy Cluster Accretion Shock Regions
• Discovery of a multiphase OVI and OVII absorber in the circumgalactic/intergalactic transition region
• The warm-hot intergalactic medium in inter-cluster filaments -- A forecast for HUBS observations based on eRASS1 superclusters
• Eigenvalue Method for NEI Unit in FLASH Code