Probing the thermal history during reionization using a semi-numerical photon-conserving code SCRIPT

Abstract

The ionization and thermal state of the intergalactic medium (IGM) during the epoch of reionization has been of interest in recent times because of their close connection to the first stars. We present in this paper a semi-numerical code which computes the large-scale temperature and ionized hydrogen fields in a cosmologically representative volume accounting for the patchiness in these quantities arising from reionization. The code is an extension to a previously developed version for studying the growth of ionized regions, namely, Semi Numerical Code for ReionIzation with PhoTon Conservation (SCRIPT). The main additions in the present version are the inhomogeneous recombinations which are essential for temperature calculations. This extended version of SCRIPT also implements physical consequences of photoheating during reionization, e.g., radiative feedback. These enhancements allow us to predict observables which were not viable with the earlier version. These include the faint-end of the ultra-violet luminosity function of galaxies (which can get affected by the radiative feedback) and the temperature-density relation of the low-density IGM at $z\sim 6$. We study the effect of varying the free parameters and prescriptions of our model on a variety of observables. The conclusion of our analysis is that it should be possible to put constraints on the evolution of thermal and ionization state of the IGM using available observations accounting for all possible variations in the free parameters. A detailed exploration of the parameter space will be taken up in the future.

Accepted for publication in MNRAS

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Cited by in corpus (17)

• A Short Introduction to Reionization Physics
• Studying Cosmic Dawn using redshifted HI 21-cm signal: A brief review
• Constraining the reionization and thermal history of the Universe using a semi-numerical photon-conserving code SCRIPT
• Probing early universe through redshifted 21-cm signal: Modelling and observational challenges
• Modelling the star-formation activity and ionizing properties of high-redshift galaxies
• Efficient exploration of reionization parameters for the upcoming 21 cm observations using a photon conserving semi-numerical model SCRIPT
• Thermal and Reionisation History within a Large-Volume Semi-Analytic Galaxy Formation Simulation
• 21cmFirstCLASS II. Early linear fluctuations of the 21cm signal
• A fast method of reionization parameter space exploration using GPR trained SCRIPT
• Deciphering Faint Gyrosynchrotron Emission from Coronal Mass Ejection using Spectro-polarimetric Radio Imaging
• Prospects of FRBs and Large Scale 21 cm Power Spectra in Constraining the Epoch of Reionization
• Probing the Epoch of Reionization using synergies of line intensity mapping
• Simulating the epoch of Helium Reionization in photon-conserving semi-numerical code SCRIPT
• Efficient Modelling of Lyman-α opacity fluctuations during late reionization epoch
• Measuring the IGM correlation length at 5<z<6.1: a fast change at the end of Reionization
• Studying dark gaps in Ly-$\alpha$ forest transmission with large reionization simulations
• Accelerating reionization constraints: An ANN-emulator framework for the SCRIPT Semi-numerical Model