Abstract

Contributed Talk - Splinter LIM   (MW-2050)

Cross-instrument cross-correlation for submm line intensity mapping

J. Clarke
Universität zu Köln

Recovering line emission signal from high-redshift galaxies through submm line intensity mapping will be challenging in the early stages of observations, due to the presence of noise effects and foreground contaminants. Cross-correlation between different observing frequencies bypasses this issue, as only emission from the same galaxies will correlate (as it traces the underlying mass function), whilst contaminants will not. If one half of the line emission is well-constrained, this cross-spectra can be used to constrain the auto-spectra of the other line, and so the galaxy luminosity function. Most prior analysis of cross-correlation has focused on individual instruments, for line-catalogue cross correlations or specific individual lines. Here we present a more holistic approach to investigate the topic, taking multiple current-generation submm observations (including from COMAP, TIM, EXCLAIM, and FYST) as well as next-generation ones (such as from TIFUUN), and determining all possible cross-correlations between them. This broad approach used COSMOS2020 data as a base, providing an empirical foundation for the predictions. From such a large amount of potential cross-correlations, we isolate which ones are most feasible at different stages of observations, and can also demonstrate possible recoveries of auto-spectra from triplets of cross-spectra. In this way we showcase additional opportunities to recover submm signal, which are otherwise impossible with individual instruments.