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2016

Insights from probability distribution functions of intensity maps

Breysse, Patrick C., Kovetz, Ely D., Behroozi, Peter S. et al.

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In the next few years, intensity-mapping surveys that target lines such as CO, Ly$\alpha$, and CII stand to provide powerful probes of high-redshift astrophysics.

However, these line emissions are highly non-Gaussian, and so the typical power-spectrum methods used to study these maps will leave out a significant amount of information.
We propose a new statistic, the probability distribution of voxel intensities, which can access this extra information.
Using a model of a CO intensity map at $z\sim3$ as an example, we demonstrate that this voxel intensity distribution (VID) provides substantial constraining power beyond what is obtainable from the power spectrum alone.

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