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AMI limits on 15 GHz excess emission in northern HII regions
A. M. M. Scaife, N. Hurley-Walker, M. L. Davies +13
We present observations between 14.2 and 17.9 GHz of sixteen Galactic HII regions made with the Arcminute Microkelvin Imager (AMI). In conjunction with data from the literature at…
A Cosmic Microwave Background feature consistent with a cosmic texture
M. Cruz, N. Turok, P. Vielva +2
The Cosmic Microwave Background provides our most ancient image of the Universe and our best tool for studying its early evolution. Theories of high energy physics predict the form…
Simulations of astronomical imaging phased arrays
George Saklatvala, Stafford Withington, Michael P. Hobson
We describe a theoretical procedure for analyzing astronomical phased arrays with overlapping beams, and apply the procedure to simulate a simple example. We demonstrate the effect…
Fast optimal CMB power spectrum estimation with Hamiltonian sampling
J. F. Taylor, M. A. J. Ashdown, M. P. Hobson
We present a method for fast optimal estimation of the temperature angular power spectrum from observations of the cosmic microwave background. We employ a Hamiltonian Monte Carlo…
Theoretical Analysis of Astronomical Phased Arrays
S. Withington, G. Saklatvala, M. P. Hobson
Low-noise phased arrays are essential for the next generation of microwave and submillimetre wave astronomy. We analyze their behaviour from a functional perspective, and show that…
A low CMB variance in the WMAP data
C. Monteserin, R. B. Barreiro, P. Vielva +3
We have estimated the CMB variance from the three-year WMAP data, finding a value which is significantly lower than the one expected from Gaussian simulations using the WMAP best-f…