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High-sensitivity measurements of the cosmic microwave background power spectrum with the extended Very Small Array

Dickinson, Clive and Battye, Richard A. and Carreira, Pedro and Cleary, Kieran and Davies, Rod D. and Davis, Richard J. and Genova-Santos, Ricardo and Grainge, Keith and Gutiérrez, Carlos M. and Hafez, Yaser A. and Hobson, Michael P. and Jones, Michael E. and Kneissl, Rüdiger and Lancaster, Katy and Lasenby, Anthony and Leahy, J. P. and Maisinger, Klaus and Ödman, Carolina and Pooley, Guy and Rajguru, Nutan and Rebolo, Rafael and Alberto Rubiño-Martín, José and Saunders, Richard D. E. and Savage, Richard S. and Scaife, Anna and Scott, Paul F. and Slosar, Anže and Sosa Molina, Pedro and Taylor, Angela C. and Titterington, David and Waldram, Elizabeth and Watson, Robert A. and Wilkinson, Althea (2004) High-sensitivity measurements of the cosmic microwave background power spectrum with the extended Very Small Array. Monthly Notices of the Royal Astronomical Society, 353 (3). pp. 732-746. ISSN 0035-8711. doi:10.1111/j.1365-2966.2004.08206.x.

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We present deep Ka-band (ν ≈ 33 GHz) observations of the cosmic microwave background (CMB) made with the extended Very Small Array (VSA). This configuration produces a naturally weighted synthesized FWHM beamwidth of ∼11 arcmin, which covers an ℓ range of 300 to 1500. On these scales, foreground extragalactic sources can be a major source of contamination to the CMB anisotropy. This problem has been alleviated by identifying sources at 15 GHz with the Ryle Telescope and then monitoring these sources at 33 GHz using a single-baseline interferometer collocated with the VSA. Sources with flux densities ≳20 mJy at 33 GHz are subtracted from the data. In addition, we calculate a statistical correction for the small residual contribution from weaker sources that are below the detection limit of the survey. The CMB power spectrum corrected for Galactic foregrounds and extragalactic point sources is presented. A total ℓ range of 150–1500 is achieved by combining the complete extended array data with earlier VSA data in a compact configuration. Our resolution of Δℓ ≈ 60 allows the first three acoustic peaks to be clearly delineated. This is achieved by using mosaiced observations in seven regions covering a total area of 82 deg². There is good agreement with the Wilkinson Microwave Anisotropy Probe (WMAP) data up to ℓ = 700 where WMAP data run out of resolution. For higher ℓ values out to ℓ = 1500, the agreement in power spectrum amplitudes with other experiments is also very good despite differences in frequency and observing technique.

Item Type:Article
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URLURL TypeDescription Paper
Dickinson, Clive0000-0002-0045-442X
Battye, Richard A.0000-0002-4269-515X
Genova-Santos, Ricardo0000-0001-5479-0034
Grainge, Keith0000-0002-6780-1406
Jones, Michael E.0000-0003-3564-6680
Rebolo, Rafael0000-0003-3767-7085
Slosar, Anže0000-0002-8713-3695
Alternate Title:High sensitivity measurements of the CMB power spectrum with the extended Very Small Array
Additional Information:© 2004 RAS, MNRAS. Accepted 2004 July 7. Received 2004 June 30; in original form 2004 February 23. First of all we thank the anonymous referee for detailed comments that have significantly improved the style of the paper and presentation of the results. CD is grateful to Tim Pearson for reading the text carefully and making useful comments on the paper. We thank the staff of Jodrell Bank Observatory, Mullard Radio Astronomy Observatory and the Teide Observatory for assistance in the day-to-day operation of the VSA. We are very grateful to PPARC for the funding and support for the VSA project and to the Instituto de Astrofísica de Canarias (IAC) for supporting and maintaining the VSA in Tenerife. Partial financial support was provided by Spanish Ministry of Science and Technology project AYA2001-1657. JAR-M acknowledges the hospitality of the IAC during several visits. CD acknowledges PPARC for funding a post-doctoral research associate position for part of this work. KL, NR, AS and RS are funded by PPARC studentships. YAH is supported by the Space Research Institute of KACST. AS acknowledges the support of St. Johns College, Cambridge. CO thanks the African Institute for Mathematical Sciences for their hospitality.
Funding AgencyGrant Number
Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
Instituto de Astrofísica de Canarias (IAC)UNSPECIFIED
Ministerio de Ciencia e Innovación (MCINN)AYA2001-1657
King Abdulaziz City for Science and Technology (KACST)UNSPECIFIED
St. John's College, CambridgeUNSPECIFIED
Subject Keywords:techniques: interferometric, cosmic microwave background, cosmology: observations
Issue or Number:3
Record Number:CaltechAUTHORS:20210116-163807751
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Official Citation:Clive Dickinson, Richard A. Battye, Pedro Carreira, Kieran Cleary, Rod D. Davies, Richard J. Davis, Ricardo Genova-Santos, Keith Grainge, Carlos M. Gutiérrez, Yaser A. Hafez, Michael P. Hobson, Michael E. Jones, Rüdiger Kneissl, Katy Lancaster, Anthony Lasenby, J. P. Leahy, Klaus Maisinger, Carolina Ödman, Guy Pooley, Nutan Rajguru, Rafael Rebolo, José Alberto Rubiño-Martin, Richard D. E. Saunders, Richard S. Savage, Anna Scaife, Paul F. Scott, Anže Slosar, Pedro Sosa Molina, Angela C. Taylor, David Titterington, Elizabeth Waldram, Robert A. Watson, Althea Wilkinson, High-sensitivity measurements of the cosmic microwave background power spectrum with the extended Very Small Array, Monthly Notices of the Royal Astronomical Society, Volume 353, Issue 3, September 2004, Pages 732–746,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107528
Deposited By: Rebecca Minjarez
Deposited On:22 Jan 2021 18:45
Last Modified:16 Nov 2021 19:04

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