Bibcode
Taylor, Angela C.; Carreira, Pedro; Cleary, Kieran; Davies, Rod D.; Davis, Richard J.; Dickinson, Clive; Grainge, Keith; Gutiérrez, Carlos M.; Hobson, Michael P.; Jones, Michael E.; Kneissl, Rüdiger; Lasenby, Anthony; Leahy, J. P.; Maisinger, Klaus; Pooley, Guy G.; Rebolo, Rafael; Rubiño-Martin, J. A.; Rusholme, Ben; Saunders, Richard D. E.; Savage, Richard; Scott, Paul F.; Slosar, Anže; Sosa Molina, Pedro J.; Titterington, David; Waldram, Elizabeth; Watson, Robert A.; Wilkinson, Althea
Referencia bibliográfica
Monthly Notice of the Royal Astronomical Society, Volume 341, Issue 4, pp. 1066-1075.
Fecha de publicación:
6
2003
Número de citas
49
Número de citas referidas
44
Descripción
We have observed the cosmic microwave background (CMB) temperature
fluctuations in eight fields covering three separated areas of sky with
the Very Small Array at 34 GHz. A total area of 101 square degrees has
been imaged, with sensitivity on angular scales of (equivalent to
angular multipoles l= 150-900). We describe the field selection and
observing strategy for these observations. In the full-resolution images
(with synthesized beam of FWHM ~=17 arcmin) the thermal noise is
typically 45 μK and the CMB signal typically 55 μK. The noise
levels in each field agree well with the expected thermal noise level of
the telescope, and there is no evidence of any residual systematic
features. The same CMB features are detected in separate, overlapping
observations. Discrete radio sources have been detected using a separate
15-GHz survey and their effects removed using pointed follow-up
observations at 34 GHz. We estimate that the residual confusion noise
arising from unsubtracted radio sources is less than 14 mJy
beam-1 (15 μK in the full-resolution images), which added
in quadrature to the thermal noise increases the noise level by 6 per
cent. We estimate that the rms contribution to the images from diffuse
Galactic emission is less than 6 μK. We also present images that are
convolved to maximize the signal-to-noise ratio of the CMB features and
are co-added in overlapping areas, in which the signal-to-noise ratio of
some individual CMB features exceeds 8.