A partial inventory of observational anisotropies in single-dish line-intensity mapping. (arXiv:1905.00209v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Chung_D/0/1/0/all/0/1">Dongwoo T. Chung</a>

Line-intensity mapping, being an imperfect observation of the line-intensity
field in a cosmological volume, will be subject to various anisotropies
introduced in observation. Existing literature in the context of CO and [C II]
line-intensity mapping often predicts only the real-space, spherically averaged
line-intensity power spectrum, with some works considering anisotropies while
examining projection of interloper emission. We explicitly consider a
simplified picture of redshift-space distortions and instrumental effects due
to limited resolution, and how these distort an isotropic line-intensity signal
in real space and introduce strong apparent anisotropies. The results suggest
that while signal loss due to limited instrumental resolution is unavoidable,
measuring the quadrupole power spectrum in addition to the monopole would still
break parameter degeneracies present in monopole-only constraints, even without
a measurement of the full anisotropic power spectrum.

Line-intensity mapping, being an imperfect observation of the line-intensity
field in a cosmological volume, will be subject to various anisotropies
introduced in observation. Existing literature in the context of CO and [C II]
line-intensity mapping often predicts only the real-space, spherically averaged
line-intensity power spectrum, with some works considering anisotropies while
examining projection of interloper emission. We explicitly consider a
simplified picture of redshift-space distortions and instrumental effects due
to limited resolution, and how these distort an isotropic line-intensity signal
in real space and introduce strong apparent anisotropies. The results suggest
that while signal loss due to limited instrumental resolution is unavoidable,
measuring the quadrupole power spectrum in addition to the monopole would still
break parameter degeneracies present in monopole-only constraints, even without
a measurement of the full anisotropic power spectrum.

http://arxiv.org/icons/sfx.gif