Follow-up observations at 16 and 33 GHz of extragalactic sources from WMAP 3-yr data: I – Spectral properties
We present follow-up observations of 97 point sources from the Wilkinson MicrowaveAnisotropy Probe (WMAP) 3-yr data, contained within the New Extragalactic WMAP PointSource catalogue between-4? =d =60?; the sources form a flux-density-limited sample completeto 1.1 Jy (˜5s) at 33 GHz. Our observation...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
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Oxford University Press
2009
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| Online Access: | http://mnras.oxfordjournals.org/content/400/2/984.full.pdf+html http://hdl.handle.net/20.500.11937/8277 |
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| author | Davies, M. Franzen, Thomas Davies, R. Davis, R. Feroz, F. Genova-Santos, R. Grainge, K. Green, D. Hobson, M. Hurley-Walker, Natasha Lasenby, A. Lopez-Caniego, M. Olamaie, M. Padilla-Torres, C. Pooley, G. Rebolo, R. Rodriguez-Gonzalvez, C. Saunders, R. Scaife, A. Scott, P. Shimwell, T. Titterington, D. Waldram, E. Watson, R. Zwart, J. |
| author_facet | Davies, M. Franzen, Thomas Davies, R. Davis, R. Feroz, F. Genova-Santos, R. Grainge, K. Green, D. Hobson, M. Hurley-Walker, Natasha Lasenby, A. Lopez-Caniego, M. Olamaie, M. Padilla-Torres, C. Pooley, G. Rebolo, R. Rodriguez-Gonzalvez, C. Saunders, R. Scaife, A. Scott, P. Shimwell, T. Titterington, D. Waldram, E. Watson, R. Zwart, J. |
| author_sort | Davies, M. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We present follow-up observations of 97 point sources from the Wilkinson MicrowaveAnisotropy Probe (WMAP) 3-yr data, contained within the New Extragalactic WMAP PointSource catalogue between-4? =d =60?; the sources form a flux-density-limited sample completeto 1.1 Jy (˜5s) at 33 GHz. Our observations were made at 16 GHz using the ArcminuteMicrokelvin Imager and at 33 GHz with the Very Small Array (VSA).94 of the sources have reliable, simultaneous – typically a few minutes apart – observationswith both telescopes. The spectra between 13.9 and 33.75 GHz are very different from thoseof bright sources at low frequency: 44 per cent have rising spectra (a33.7513.9 < 0.0), where S ??-a, and 93 per cent have spectra with a33.7513.9 < 0.5; the median spectral index is 0.04.For the brighter sources, the agreement between VSA and WMAP 33-GHz flux densitiesaveraged over sources is very good. However, for the fainter sources, the VSA tends to measurelower values for the flux densities than WMAP. We suggest that the main cause of this effectis the Eddington bias arising from variability. |
| first_indexed | 2025-11-14T06:20:06Z |
| format | Journal Article |
| id | curtin-20.500.11937-8277 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:20:06Z |
| publishDate | 2009 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-82772017-02-28T01:31:43Z Follow-up observations at 16 and 33 GHz of extragalactic sources from WMAP 3-yr data: I – Spectral properties Davies, M. Franzen, Thomas Davies, R. Davis, R. Feroz, F. Genova-Santos, R. Grainge, K. Green, D. Hobson, M. Hurley-Walker, Natasha Lasenby, A. Lopez-Caniego, M. Olamaie, M. Padilla-Torres, C. Pooley, G. Rebolo, R. Rodriguez-Gonzalvez, C. Saunders, R. Scaife, A. Scott, P. Shimwell, T. Titterington, D. Waldram, E. Watson, R. Zwart, J. radio continuum: general cosmology: observations galaxies: active cosmic macrowave background We present follow-up observations of 97 point sources from the Wilkinson MicrowaveAnisotropy Probe (WMAP) 3-yr data, contained within the New Extragalactic WMAP PointSource catalogue between-4? =d =60?; the sources form a flux-density-limited sample completeto 1.1 Jy (˜5s) at 33 GHz. Our observations were made at 16 GHz using the ArcminuteMicrokelvin Imager and at 33 GHz with the Very Small Array (VSA).94 of the sources have reliable, simultaneous – typically a few minutes apart – observationswith both telescopes. The spectra between 13.9 and 33.75 GHz are very different from thoseof bright sources at low frequency: 44 per cent have rising spectra (a33.7513.9 < 0.0), where S ??-a, and 93 per cent have spectra with a33.7513.9 < 0.5; the median spectral index is 0.04.For the brighter sources, the agreement between VSA and WMAP 33-GHz flux densitiesaveraged over sources is very good. However, for the fainter sources, the VSA tends to measurelower values for the flux densities than WMAP. We suggest that the main cause of this effectis the Eddington bias arising from variability. 2009 Journal Article http://hdl.handle.net/20.500.11937/8277 http://mnras.oxfordjournals.org/content/400/2/984.full.pdf+html Oxford University Press restricted |
| spellingShingle | radio continuum: general cosmology: observations galaxies: active cosmic macrowave background Davies, M. Franzen, Thomas Davies, R. Davis, R. Feroz, F. Genova-Santos, R. Grainge, K. Green, D. Hobson, M. Hurley-Walker, Natasha Lasenby, A. Lopez-Caniego, M. Olamaie, M. Padilla-Torres, C. Pooley, G. Rebolo, R. Rodriguez-Gonzalvez, C. Saunders, R. Scaife, A. Scott, P. Shimwell, T. Titterington, D. Waldram, E. Watson, R. Zwart, J. Follow-up observations at 16 and 33 GHz of extragalactic sources from WMAP 3-yr data: I – Spectral properties |
| title | Follow-up observations at 16 and 33 GHz of extragalactic sources from WMAP 3-yr data: I – Spectral properties |
| title_full | Follow-up observations at 16 and 33 GHz of extragalactic sources from WMAP 3-yr data: I – Spectral properties |
| title_fullStr | Follow-up observations at 16 and 33 GHz of extragalactic sources from WMAP 3-yr data: I – Spectral properties |
| title_full_unstemmed | Follow-up observations at 16 and 33 GHz of extragalactic sources from WMAP 3-yr data: I – Spectral properties |
| title_short | Follow-up observations at 16 and 33 GHz of extragalactic sources from WMAP 3-yr data: I – Spectral properties |
| title_sort | follow-up observations at 16 and 33 ghz of extragalactic sources from wmap 3-yr data: i – spectral properties |
| topic | radio continuum: general cosmology: observations galaxies: active cosmic macrowave background |
| url | http://mnras.oxfordjournals.org/content/400/2/984.full.pdf+html http://hdl.handle.net/20.500.11937/8277 |