CosmoReionMC: A package for estimating cosmological and astrophysical parameters using CMB, Lyman-α absorption and global 21 cm data

Abstract

We present a Markov Chain Monte Carlo (MCMC)-based parameter estimation package, CosmoReionMC, to jointly constrain cosmological parameters of the $\Lambda$CDM model and the astrophysical parameters related to hydrogen reionization. The package is based on a previously developed physically motivated semi-analytical model for reionization, a similar semi-analytical model for computing the global 21~cm signal during the cosmic dawn and using an appropriately modified version of the publicly available CAMB for computing the CMB anisotropies. These calculations are then coupled to an MCMC ensemble sampler \texttt{emcee} to compute the posterior distributions of the model parameter. The model has twelve free parameters in total: five cosmological and seven related to the stellar populations. We constrain the parameters by matching the theoretical predictions with CMB data from Planck, observations related to the quasar absorption spectra and, for the first time, the global 21~cm signal from EDGES. We find that incorporating the quasar spectra data in the analysis tightens the bounds on the electron scattering optical depth $\tau$ and consequently the normalization $A_s$ of the primordial matter power spectrum (or equivalently ${\sigma }_8$). Furthermore, when we include the EDGES data in the analysis, we find that an early population of metal-free stars with efficient radio emission is necessary to match the absorption amplitude. The CosmoReionMC package should have interesting future applications, e.g., probing non-standard extensions to the $\Lambda$CDM model.

accepted in MNRAS

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Cited by in corpus (17)

• Constraining primordial black holes as dark matter using the global 21-cm signal with X-ray heating and excess radio background
• A Short Introduction to Reionization Physics
• Probing the thermal history during reionization using a semi-numerical photon-conserving code SCRIPT
• Retrieving cosmological information from small-scale CMB foregrounds II. The kinetic Sunyaev Zel'dovich effect
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• Constraining the reionization and thermal history of the Universe using a semi-numerical photon-conserving code SCRIPT
• Modelling the star-formation activity and ionizing properties of high-redshift galaxies
• Non-parametric Reconstruction of Photon Escape Fraction from Reionization
• A framework to mitigate patchy reionization contamination on the primordial gravitational wave signal
• Impact of cosmic rays on the global 21-cm signal during cosmic dawn
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• Probing the Epoch of Reionization using synergies of line intensity mapping
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• Predictions of the 21cm global signal in the JWST and ALMA era
• What can we learn about Reionization astrophysical parameters using Gaussian Process Regression?
• Implications of the cosmological 21-cm absorption profile for high-redshift star formation and deep JWST surveys
• A Comprehensive Bayesian re-analysis of the SARAS2 data from the Epoch of Reionization