Abstract Details
| Name: Archis Mukhopadhyay Affiliation: Indian Institute of Science Education and Research Kolkata Conference ID: ASI2025_612 Title : The 21-cm signal from the Cosmic Dawn: Comparing the statistical properties from the 21cmFAST and GRIZZLY simulations Authors and Co-Authors : Archis Mukhopadhyay 1, Raghunath Ghara 1 Abstract Type : Poster Abstract Category : Galaxies and Cosmology Abstract : The 21cm signal of neutral Hydrogen is set to revolutionize our understanding of the astrophysics of the high redshift Universe. Several attempts have been made to model this signal using numerical, semi-numerical, and analytical approaches. In this work, we compare the outcomes of two simulations, GRIZZLY and 21cmFAST, in the Cosmic Dawn. 21cmFAST is a semi-numerical code that generates the density, ionization, peculiar velocity, and spin temperature fields to produce the differential 21-cm brightness temperature. On the other hand, GRIZZLY is a 1-D radiative transfer code, assuming every galaxy to be a spherically symmetric source of photons. We use the same density fields and source properties for both algorithms to ensure a consistent comparison. We explore the variation in the specific X-ray luminosity per unit star formation (L_X / SFR) and the turnover halo mass for efficient star formation and compare the statistical properties of the signal, such as the power spectrum, bispectrum, and HII bubble morphology descriptors. |