An Improved Treatment of Cosmological Intergalactic Medium Evolution

Abstract

The modeling of galaxy formation and reionization, two central issues of modern cosmology, relies on the accurate follow-up of the intergalactic medium (IGM). Unfortunately, owing to the complex nature of this medium, the differential equations governing its ionization state and temperature are only approximate. In this paper, we improve these master equations. We derive new expression for the distinct composite inhomogeneous IGM phases, including all relevant ionizing/recombining and cooling/heating mechanisms, taking into account inflows/outflows into/from halos, and using more accurate recombination coefficients. Furthermore, to better compute the source functions in the equations we provide an analytic procedure for calculating the halo mass function in ionized environments, accounting for the bias due to the ionization state of their environment. Such an improved treatment of IGM evolution is part of a complete realistic model of galaxy formation presented elsewhere.

7 pages, 4 figures, accepted for publication in ApJ

References in corpus (7)

• A New Calculation of the Ionizing Background Spectrum and the Effects of HeII Reionization
• Massloss of galaxies due to a UV-background
• Self-regulated reionization
• Imprint of Inhomogeneous Hydrogen Reionization on the Temperature Distribution of the Intergalactic Medium
• UV Radiative Feedback During the Advanced Stages of Reionization
• A Linear Perturbation Theory of Inhomogeneous Reionization
• Leaving the dark ages with AMIGA

Cited by in corpus (2)

• Constraining the epoch of reionization from the observed properties of the high-z Universe
• Lyman-$\alpha$ Emitting Galaxies (LAEs) at Cosmic Dawn: Implications and Predictions