Estimating the bispectrum of the Very Small Array data
We estimate the bispectrum of the Very Small Array data from the compact and extended configuration observations released in December 2002, and compare our results to those obtained from Gaussian simulations. There is a slight excess of large bispectrum values for two individual fields, but this doe...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Journal article |
| Published: |
2004
|
| _version_ | 1826300807253852160 |
|---|---|
| author | Smith, S Rocha, G Challinor, A Battye, R Carreira, P Cleary, K Davies, R Davis, R Dickinson, C Genova-Santos, R Grainge, K Gutierrez, C Hafez, Y Hobson, M Jones, M Kneissl, R Lancaster, K Lasenby, A Leahy, J Maisinger, K Pooley, G Rajguru, N Rebolo, R Rubino-Martin, J Molina, P |
| author_facet | Smith, S Rocha, G Challinor, A Battye, R Carreira, P Cleary, K Davies, R Davis, R Dickinson, C Genova-Santos, R Grainge, K Gutierrez, C Hafez, Y Hobson, M Jones, M Kneissl, R Lancaster, K Lasenby, A Leahy, J Maisinger, K Pooley, G Rajguru, N Rebolo, R Rubino-Martin, J Molina, P |
| author_sort | Smith, S |
| collection | OXFORD |
| description | We estimate the bispectrum of the Very Small Array data from the compact and extended configuration observations released in December 2002, and compare our results to those obtained from Gaussian simulations. There is a slight excess of large bispectrum values for two individual fields, but this does not appear when the fields are combined. Given our expected level of residual point sources, we do not expect these to be the source of the discrepancy. Using the compact configuration data, we put an upper limit of 5400 on the value of f_NL, the non-linear coupling parameter, at 95 per cent confidence. We test our bispectrum estimator using non-Gaussian simulations with a known bispectrum, and recover the input values. |
| first_indexed | 2024-03-07T05:22:46Z |
| format | Journal article |
| id | oxford-uuid:df7e0912-9654-4876-9554-f223df78f904 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T05:22:46Z |
| publishDate | 2004 |
| record_format | dspace |
| spelling | oxford-uuid:df7e0912-9654-4876-9554-f223df78f9042022-03-27T09:39:50ZEstimating the bispectrum of the Very Small Array dataJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:df7e0912-9654-4876-9554-f223df78f904Symplectic Elements at Oxford2004Smith, SRocha, GChallinor, ABattye, RCarreira, PCleary, KDavies, RDavis, RDickinson, CGenova-Santos, RGrainge, KGutierrez, CHafez, YHobson, MJones, MKneissl, RLancaster, KLasenby, ALeahy, JMaisinger, KPooley, GRajguru, NRebolo, RRubino-Martin, JMolina, PWe estimate the bispectrum of the Very Small Array data from the compact and extended configuration observations released in December 2002, and compare our results to those obtained from Gaussian simulations. There is a slight excess of large bispectrum values for two individual fields, but this does not appear when the fields are combined. Given our expected level of residual point sources, we do not expect these to be the source of the discrepancy. Using the compact configuration data, we put an upper limit of 5400 on the value of f_NL, the non-linear coupling parameter, at 95 per cent confidence. We test our bispectrum estimator using non-Gaussian simulations with a known bispectrum, and recover the input values. |
| spellingShingle | Smith, S Rocha, G Challinor, A Battye, R Carreira, P Cleary, K Davies, R Davis, R Dickinson, C Genova-Santos, R Grainge, K Gutierrez, C Hafez, Y Hobson, M Jones, M Kneissl, R Lancaster, K Lasenby, A Leahy, J Maisinger, K Pooley, G Rajguru, N Rebolo, R Rubino-Martin, J Molina, P Estimating the bispectrum of the Very Small Array data |
| title | Estimating the bispectrum of the Very Small Array data |
| title_full | Estimating the bispectrum of the Very Small Array data |
| title_fullStr | Estimating the bispectrum of the Very Small Array data |
| title_full_unstemmed | Estimating the bispectrum of the Very Small Array data |
| title_short | Estimating the bispectrum of the Very Small Array data |
| title_sort | estimating the bispectrum of the very small array data |
| work_keys_str_mv | AT smiths estimatingthebispectrumoftheverysmallarraydata AT rochag estimatingthebispectrumoftheverysmallarraydata AT challinora estimatingthebispectrumoftheverysmallarraydata AT battyer estimatingthebispectrumoftheverysmallarraydata AT carreirap estimatingthebispectrumoftheverysmallarraydata AT clearyk estimatingthebispectrumoftheverysmallarraydata AT daviesr estimatingthebispectrumoftheverysmallarraydata AT davisr estimatingthebispectrumoftheverysmallarraydata AT dickinsonc estimatingthebispectrumoftheverysmallarraydata AT genovasantosr estimatingthebispectrumoftheverysmallarraydata AT graingek estimatingthebispectrumoftheverysmallarraydata AT gutierrezc estimatingthebispectrumoftheverysmallarraydata AT hafezy estimatingthebispectrumoftheverysmallarraydata AT hobsonm estimatingthebispectrumoftheverysmallarraydata AT jonesm estimatingthebispectrumoftheverysmallarraydata AT kneisslr estimatingthebispectrumoftheverysmallarraydata AT lancasterk estimatingthebispectrumoftheverysmallarraydata AT lasenbya estimatingthebispectrumoftheverysmallarraydata AT leahyj estimatingthebispectrumoftheverysmallarraydata AT maisingerk estimatingthebispectrumoftheverysmallarraydata AT pooleyg estimatingthebispectrumoftheverysmallarraydata AT rajgurun estimatingthebispectrumoftheverysmallarraydata AT rebolor estimatingthebispectrumoftheverysmallarraydata AT rubinomartinj estimatingthebispectrumoftheverysmallarraydata AT molinap estimatingthebispectrumoftheverysmallarraydata |