Antisymmetric cross-correlation of line-intensity maps as a probe of reionization

Abstract

We present a new estimator for the cross-correlation signal between line intensity maps to probe the Epoch of Reionization. The proposed estimator is the hitherto neglected antisymmetric component of the cross-correlation, under the exchange of line-of-sight positions. We consider the cross-correlation between HI and CO fluctuations, and forecast the improvement in precision on reionization parameters when the antisymmetric contribution is accounted for. As a way to break the degeneracy between astrophysics and cosmology in the intensity mapping power spectrum, we study the ratio between the antisymmetric and symmetric components. While our results depend on the highly uncertain astrophysical modelling, we show that in most standard scenarios including the antisymmetric contribution as a complementary probe can lead to a significant gain in information.

arXiv comment9 pages, 3 figures

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Cited by in corpus (9)

• Line-Intensity Mapping: Theory Review
• Strategies to Detect Dark-Matter Decays with Line-Intensity Mapping
• Signatures of primordial black holes in gravitational wave clustering
• A multi-tracer empirically-driven approach to line-intensity mapping lightcones
• Antisymmetric Cross-correlation between H I and CO Line Intensity Maps as a New Probe of Cosmic Reionization
• Bayesian Multi-line Intensity Mapping
• Removal of interloper contamination to line-intensity maps using correlations with ancillary tracers of the large-scale structure
• Probing the warm dark matter mass with [C II] intensity mapping
• Robust Intensity Mapping Analysis against Foregrounds for the Epoch of Reionization