Non-Gaussianity constraints using future radio continuum surveys and the multitracer technique
Monthly Notices of the Royal Astronomical Society Oxford University Press 492:1 (2019) 1513-1522
Abstract:
Tighter constraints on measurements of primordial non-Gaussianity (PNG) will allow the differentiation of inflationary scenarios. The cosmic microwave background bispectrum – the standard method of measuring the local non-Gaussianity – is limited by cosmic variance. Therefore, it is sensible to investigate measurements of non-Gaussianity using the large-scale structure. This can be done by investigating the effects of non-Gaussianity on the power spectrum on large scales. In this study, we forecast the constraints on the local PNG parameter fNL that can be obtained with future radio surveys. We utilize the multitracer method that reduces the effect of cosmic variance and takes advantage of the multiple radio galaxy populations that are differently biased tracers of the same underlying dark matter distribution. Improvements on previous work include the use of observational bias and halo mass estimates, updated simulations, and realistic photometric redshift expectations, thus producing more realistic forecasts. Combinations of Square Kilometre Array simulations and radio observations were used as well as different redshift ranges and redshift bin sizes. It was found that in the most realistic case the 1σ error on fNL falls within the range 4.07–6.58, rivalling the tightest constraints currently available.The environment and host haloes of the brightest z~6 Lyman-break galaxies
Monthly Notices of the Royal Astronomical Society Oxford University Press 477:3 (2018) 3760-3774
Abstract:
By studying the large-scale structure of the bright high-redshift Lyman-break galaxy (LBG) population it is possible to gain an insight into the role of environment in galaxy formation physics in the early Universe. We measure the clustering of a sample of bright ($-22.7The clustering and bias of radio-selected AGN and star-forming galaxies in the COSMOS field
Monthly Notices of the Royal Astronomical Society Oxford University Press 474:3 (2017) 4133-4150