Disentangling the anisotropic radio sky: Fisher forecasts for 21cm arrays
arxiv(2024)
摘要
The existence of a radio synchrotron background (RSB) is implied by a number
of measurements, including excess emission seen by the ARCADE2 and LWA
experiments. Highly sensitive wideband radio arrays, of the kind used to
measure the cosmic 21-cm signal, provide a promising way to further constrain
the RSB through its anisotropy, providing additional insight into its origin.
We present a framework for evaluating the potential of 21-cm arrays to
disentangle different components of the diffuse radio sky based on the
combination of their frequency spectrum and angular power spectrum (APS). The
formalism is designed to calculate uncertainties due to the intrinsic cosmic
variance alone or together with instrumental noise. In particular, we predict
the potential for measuring the anisotropy of a broad generalised class of
excess radio background models using the low-frequency HERA array as an
example. We find that a HERA-like array can distinguish an RSB from other sky
components based on its angular clustering and spectral dependence, even if
these are quite similar to one or more of the other components – but only in
the case that the RSB is relatively bright.
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