Revisiting the [C ii] 158 μm line-intensity mapping power spectrum from the EoR using non-uniform line-luminosity scatter

• DOI: 10.1093/mnras/stac3304
• Publication Date: 2022-11-10T22:35:12Z
• Authors: Chandra Shekhar M...; Karen P Olsen; Thomas R Greve; Suman Majumdar; Kanan K Datta; Bryan R Scott; T K Daisy Leung; Romeel Davé; Gergö Popping; Raul Ortega Ochoa; David Vizgan; Desika Narayanan
• Keywords: Intensity mapping; Hydrogen line

Detecting the line-intensity mapping (LIM) signal from galaxies of Epoch Reionization is an emerging tool to constrain their role in reionization. Ongoing and upcoming experiments target fluctuations across sky reveal statistical astrophysical properties these via statistics, e.g., power spectrum. Here, we revisit [C II]$_{158 \mu \text{m}}$ LIM spectrum under non-uniform line-luminosity scatter, which has a halo-mass variation properties. Line-luminosity scatter cosmological hydrodynamic radiative transfer simulation at $z=6$ considered this study. We test robustness different model frameworks that interpret impact on statistics. use simple power-law fit demonstrate mean luminosity-halo mass correlation cannot preserve intensity (hence clustering spectrum) scatter. In our case, changes by $\sim 48$ per cent compared contrast general case with semi-analytic However, find prediction for most-probable can be modelled robustly, considering generalized more realistic also explore possibility diminishing luminosity bias affecting spectrum, although phenomenon might not statistically significant. Therefore, should adopt appropriate approaches consistently observations.