Implication of the [C II]$_{158 \mu \text{m}}$ Luminosity Scatter on the Line-intensity Mapping Power Spectrum from the EoR

2021 
Redshifted [C II]$_{158 \mu\text{m}}$ line-intensity mapping (LIM) of the Epoch of Reionization (EoR) with ongoing and upcoming experiments like the CONCERTO, TIME and FYST, is a new tool to constrain the role of the early galaxies in reionization. We expect statistics, e.g., the power spectrum of the LIM signal to be detectable by these experiments which will help us understand the clustering and astrophysical properties of the [C II] line emitters. Although the fluctuations of the LIM signal are generally modeled by assuming a one-to-one $L_{\text{[CII]}}$-$M_{\text{halo}}$ relationship, the scatter in the [C II] luminosity, arising due to various ongoing astrophysical processes under varied environment inside individual galaxies, will also impact the power spectrum. In this work, using the results from a hydrodynamic and radiative transfer simulation of early galaxies, we find that this scatter can enhance the LIM power spectrum up to a factor of $\sim 2.7-2.9$ (at $z=6$). It is, therefore, crucial to take the effect of [C II] luminosity scatter into account while interpreting the [C II] LIM power spectrum from future observations.
    • Correction
    • Source
    • Cite
    • Save
    • Machine Reading By IdeaReader
    5
    References
    0
    Citations
    NaN
    KQI
    []