First results from the Very Small Array -- I. Observational methods

Details First results from the Very Small Array -- I. Observational methods First results from the Very Small Array -- I. Observational methods

2002-05-22

arxiv.org/abs/astro-ph/0205378v2

Mon.Not.Roy.Astron.Soc. 341 (2003) 1057

Astronomy and Astrophysics

Astrophysics

9 pages, 10 figures, MNRAS in press (Minor revisions)

Scientific paper

10.1046/j.1365-8711.2003.06338.x

The Very Small Array (VSA) is a synthesis telescope designed to image faint structures in the cosmic microwave background on degree and sub-degree angular scales. The VSA has key differences from other CMB interferometers with the result that different systematic errors are expected. We have tested the operation of the VSA with a variety of blank-field and calibrator observations and cross-checked its calibration scale against independent measurements. We find that systematic effects can be suppressed below the thermal noise level in long observations; the overall calibration accuracy of the flux density scale is 3.5 percent and is limited by the external absolute calibration scale.

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