Radio-quiet objects in the 2QZ survey
Co-addition of blank-field FIRST data at the location of over 8000 QSOs in the 2QZ survey has yielded statistical detections of radio quiet QSOs with median flux levels of 20-40microJy. We show that the total radio flux of radio-quiet QSOs in the 2QZ is consistent with a smooth extrapolation of the...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2005
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| _version_ | 1797089015590027264 |
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| author | Wals, M Boyle, B Croom, S Miller, L Smith, R Shanks, T Outram, P |
| author_facet | Wals, M Boyle, B Croom, S Miller, L Smith, R Shanks, T Outram, P |
| author_sort | Wals, M |
| collection | OXFORD |
| description | Co-addition of blank-field FIRST data at the location of over 8000 QSOs in the 2QZ survey has yielded statistical detections of radio quiet QSOs with median flux levels of 20-40microJy. We show that the total radio flux of radio-quiet QSOs in the 2QZ is consistent with a smooth extrapolation of the 2QZ radio-loud QSO number-flux distribution based on the slope of the relation flattening near the FIRST flux limit. However, we are unable to distinguish a smooth extrapolation of the luminosity function to faint levels from a bimodal luminosity function with a break close to or below the FIRST radio detection limit. We also demonstrate that the redshift dependence of the median radio-to-optical spectral index for these radio quiet QSOs is consistent with that obtained for individual radio-loud 2QZ QSOs detected by FIRST. |
| first_indexed | 2024-03-07T02:58:25Z |
| format | Journal article |
| id | oxford-uuid:b01be5b0-1af6-4fca-a501-47d0ba022e2d |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:58:25Z |
| publishDate | 2005 |
| record_format | dspace |
| spelling | oxford-uuid:b01be5b0-1af6-4fca-a501-47d0ba022e2d2022-03-27T03:54:06ZRadio-quiet objects in the 2QZ surveyJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b01be5b0-1af6-4fca-a501-47d0ba022e2dEnglishSymplectic Elements at Oxford2005Wals, MBoyle, BCroom, SMiller, LSmith, RShanks, TOutram, PCo-addition of blank-field FIRST data at the location of over 8000 QSOs in the 2QZ survey has yielded statistical detections of radio quiet QSOs with median flux levels of 20-40microJy. We show that the total radio flux of radio-quiet QSOs in the 2QZ is consistent with a smooth extrapolation of the 2QZ radio-loud QSO number-flux distribution based on the slope of the relation flattening near the FIRST flux limit. However, we are unable to distinguish a smooth extrapolation of the luminosity function to faint levels from a bimodal luminosity function with a break close to or below the FIRST radio detection limit. We also demonstrate that the redshift dependence of the median radio-to-optical spectral index for these radio quiet QSOs is consistent with that obtained for individual radio-loud 2QZ QSOs detected by FIRST. |
| spellingShingle | Wals, M Boyle, B Croom, S Miller, L Smith, R Shanks, T Outram, P Radio-quiet objects in the 2QZ survey |
| title | Radio-quiet objects in the 2QZ survey |
| title_full | Radio-quiet objects in the 2QZ survey |
| title_fullStr | Radio-quiet objects in the 2QZ survey |
| title_full_unstemmed | Radio-quiet objects in the 2QZ survey |
| title_short | Radio-quiet objects in the 2QZ survey |
| title_sort | radio quiet objects in the 2qz survey |
| work_keys_str_mv | AT walsm radioquietobjectsinthe2qzsurvey AT boyleb radioquietobjectsinthe2qzsurvey AT crooms radioquietobjectsinthe2qzsurvey AT millerl radioquietobjectsinthe2qzsurvey AT smithr radioquietobjectsinthe2qzsurvey AT shankst radioquietobjectsinthe2qzsurvey AT outramp radioquietobjectsinthe2qzsurvey |