A search for primordial anisotropies in the cosmic microwave background radiation: first observations at 13.5 GHz with the Cosmic Anisotropy Telescope

O'Sullivan, Créidhe M.; Yassin, G.; Woan, G.; Scott, Paul F.; Saunders, Richard D. E.; Robson, M.; Pooley, G. G.; Lasenby, A.; Kenderdine, S.; Jones, Michael E.; Hobson, M.; Duffett-Smith, Peter

doi:10.1093/mnras/274.3.861

Cited by 22 publications

(15 citation statements)

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“…Preliminary analysis of the time-ordered visibility data consists of the removal of periods of bad data owing to poor weather conditions and system failures, and the subtraction of the contribution to the sky signal from identified discrete radio sources above some confusion limit. For example, O'Sullivan et al (1995) discuss how this preliminary data analysis was carried out for CMB observations with the CAT interferometer, using the Ryle Telescope (Jones 1990) to perform the radio source subtraction. For VSA observations, the systematic removal of periods of bad data are performed in an analogous manner to that used for the CAT.…”

Section: Removal Of Bad Data and Point Sourcesmentioning

confidence: 99%

Maximum-likelihood estimation of the cosmic microwave background power spectrum from interferometer observations

Hobson¹,

Maisinger²

2002

Monthly Notices of the Royal Astronomical Society

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A maximum‐likelihood method is presented for estimating the power spectrum of anisotropies in the cosmic microwave background (CMB) from interferometer observations. The method calculates flat band‐power estimates in separate bins in ℓ‐space, together with confidence intervals on the power in each bin. For multifrequency data, the power spectrum of the other foreground components may also be recovered. Advantage is taken of several characteristic properties of interferometer data, which together allow the fast calculation of the likelihood function. The method may be applied to single‐field or mosaicked observations, and proper account can be taken of non‐coplanar baselines. The method is illustrated by application to simulated data from the Very Small Array.

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Section: Removal Of Bad Data and Point Sourcesmentioning

confidence: 99%

Maximum-likelihood estimation of the cosmic microwave background power spectrum from interferometer observations

Hobson¹,

Maisinger²

2002

Monthly Notices of the Royal Astronomical Society

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“…The data from the CAT1 field were presented in O’Sullivan et al . (1995) [65] and Scott et al . (1996) [82].…”

Section: Current and Future Cmb Experimentsmentioning

confidence: 99%

The Cosmic Microwave Background

Jones¹,

Lasenby²

1998

Living Rev. Relativ.

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We present a brief review of current theory and observations of the cosmic microwave background (CMB). New predictions for cosmological defect theories and an overview of the inflationary theory are discussed. Recent results from various observations of the anisotropies of the microwave background are described and a summary of the proposed experiments is presented. A new analysis technique based on Bayesian statistics that can be used to reconstruct the underlying sky fluctuations is summarised. Current CMB data is used to set some preliminary constraints on the values of fundamental cosmological parameters Ω and Ho using the maximum likelihood technique. In addition, secondary anisotropies due to the Sunyaev-Zel’dovich effect are described.

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“…However, for very high brightness sensitivity continuum observations which demand maximum possible bandwidth with only modest spectral resolution, analogue correlators are competitive. Analogue correlators have been used in several recent interferometers dedicated to CMB observations (O'Sullivan et al 1995;Lo et al 2001;Padin et al 2002;Leitch et al 2002;Watson et al 2003).…”

Section: Introductionmentioning

confidence: 99%

A 6–12 GHz analogue lag-correlator for radio interferometry

Holler¹,

Kaneko²,

Jones

et al. 2007

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Aims. We describe a 6-12 GHz analogue correlator that has been developed for use in radio interferometers. Methods. We use a lag-correlator technique to synthesis eight complex spectral channels. Two schemes were considered for sampling the cross-correlation function, using either real or complex correlations, and we developed prototypes for both of them. We opted for the "add and square" detection scheme using Schottky diodes over the more commonly used active multipliers because the stability of the device is less critical. Results. We encountered an unexpected problem, in that there were errors in the lag spacings of up to ten percent of the unit spacing. To overcome this, we developed a calibration method using astronomical sources which corrects the effects of the non-uniform sampling as well as gain error and dispersion in the correlator.

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A search for primordial anisotropies in the cosmic microwave background radiation: first observations at 13.5 GHz with the Cosmic Anisotropy Telescope

Cited by 22 publications

References 0 publications

Maximum-likelihood estimation of the cosmic microwave background power spectrum from interferometer observations

Maximum-likelihood estimation of the cosmic microwave background power spectrum from interferometer observations

The Cosmic Microwave Background

A 6–12 GHz analogue lag-correlator for radio interferometry

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