The radio source population at high frequency: follow-up of the 15-GHz 9C survey
We have carried out extensive radio and optical follow-up of 176 sources from the 15-GHz 9th Cambridge survey. Optical identifications have been found for 155 of the radio sources; optical images are given with radio maps overlaid. The continuum radio spectrum of each source spanning the frequency r...
| Glavni autori: | , , , , , , , , |
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| Format: | Journal article |
| Jezik: | English |
| Izdano: |
2004
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| _version_ | 1826273707286331392 |
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| author | Bolton, R Cotter, G Pooley, G Riley, J Waldram, E Chandler, C Mason, B Pearson, T Readhead, A |
| author_facet | Bolton, R Cotter, G Pooley, G Riley, J Waldram, E Chandler, C Mason, B Pearson, T Readhead, A |
| author_sort | Bolton, R |
| collection | OXFORD |
| description | We have carried out extensive radio and optical follow-up of 176 sources from the 15-GHz 9th Cambridge survey. Optical identifications have been found for 155 of the radio sources; optical images are given with radio maps overlaid. The continuum radio spectrum of each source spanning the frequency range 1. 4-43 GHz is also given. Two flux-limited samples are defined, one containing 124 sources complete to 25 mJy and one of 70 sources complete to 60 mJy. Between one-fifth and one-quarter of sources from these flux-limited samples display convex radio spectra, rising between 1.4 and 4.8 GHz. These rising-spectrum sources make up a much larger fraction of the radio source population at this high selection frequency than in lower frequency surveys. We find that by using non-simultaneous survey flux density measurements at 1.4 and 15 GHz to remove steep-spectrum objects, the efficiency of selecting objects with spectra rising between 1.4 and 4.8 GHz (as seen in simultaneous measurements) can be raised to 49 per cent without compromising the completeness of the rising-spectrum sample. |
| first_indexed | 2024-03-06T22:32:19Z |
| format | Journal article |
| id | oxford-uuid:58ae76c5-8afb-464c-baab-f74a371d1bb6 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T22:32:19Z |
| publishDate | 2004 |
| record_format | dspace |
| spelling | oxford-uuid:58ae76c5-8afb-464c-baab-f74a371d1bb62022-03-26T17:05:05ZThe radio source population at high frequency: follow-up of the 15-GHz 9C surveyJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:58ae76c5-8afb-464c-baab-f74a371d1bb6EnglishSymplectic Elements at Oxford2004Bolton, RCotter, GPooley, GRiley, JWaldram, EChandler, CMason, BPearson, TReadhead, AWe have carried out extensive radio and optical follow-up of 176 sources from the 15-GHz 9th Cambridge survey. Optical identifications have been found for 155 of the radio sources; optical images are given with radio maps overlaid. The continuum radio spectrum of each source spanning the frequency range 1. 4-43 GHz is also given. Two flux-limited samples are defined, one containing 124 sources complete to 25 mJy and one of 70 sources complete to 60 mJy. Between one-fifth and one-quarter of sources from these flux-limited samples display convex radio spectra, rising between 1.4 and 4.8 GHz. These rising-spectrum sources make up a much larger fraction of the radio source population at this high selection frequency than in lower frequency surveys. We find that by using non-simultaneous survey flux density measurements at 1.4 and 15 GHz to remove steep-spectrum objects, the efficiency of selecting objects with spectra rising between 1.4 and 4.8 GHz (as seen in simultaneous measurements) can be raised to 49 per cent without compromising the completeness of the rising-spectrum sample. |
| spellingShingle | Bolton, R Cotter, G Pooley, G Riley, J Waldram, E Chandler, C Mason, B Pearson, T Readhead, A The radio source population at high frequency: follow-up of the 15-GHz 9C survey |
| title | The radio source population at high frequency: follow-up of the 15-GHz 9C survey |
| title_full | The radio source population at high frequency: follow-up of the 15-GHz 9C survey |
| title_fullStr | The radio source population at high frequency: follow-up of the 15-GHz 9C survey |
| title_full_unstemmed | The radio source population at high frequency: follow-up of the 15-GHz 9C survey |
| title_short | The radio source population at high frequency: follow-up of the 15-GHz 9C survey |
| title_sort | radio source population at high frequency follow up of the 15 ghz 9c survey |
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