The authors present a new, independent derivation of the second-order relativistic galaxy number count in a flat expanding universe, but they only validate it at linear order against previous work.
Fluctuations of differential number counts of radio continuum sources
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abstract
We investigate the differential number counts of sources in radio continuum surveys, including all terms at linear order in cosmological perturbations. Our framework does not assume a specific gauge condition. This general approach allows us to recover gauge invariance explicitly. With the complete derivations of the covariant volume integral on the past light cone, we have identified several contributions in the number counts. To clarify their underlying physics, we present each contributions in terms of scalar, vector and tensor modes. This theoretical framework promises to be widely applicable to continuum radio galaxy surveys to model the expected angular power spectrum and two-point correlation.
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astro-ph.CO 1years
2019 1verdicts
CONDITIONAL 1representative citing papers
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Galaxy number counts at second order: an independent approach
The authors present a new, independent derivation of the second-order relativistic galaxy number count in a flat expanding universe, but they only validate it at linear order against previous work.