The AT20G view of swift/BAT selected AGN: High-frequency radio waves meet hard X-rays
We cross-matched the 6-year Swift/Burst Alert Telescope (BAT) survey of active galactic nuclei (AGN) with the AT20G radio survey of the southern sky, which is one of the largest high-frequency radio surveys available.With these datawe investigated the possible correlation between the radio and the X...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
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Oxford University Press
2013
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| Online Access: | http://hdl.handle.net/20.500.11937/62516 |
| _version_ | 1848760866548219904 |
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| author | Burlon, D. Ghirlanda, G. Murphy, T. Chhetri, Rajan Sadler, E. Ajello, M. |
| author_facet | Burlon, D. Ghirlanda, G. Murphy, T. Chhetri, Rajan Sadler, E. Ajello, M. |
| author_sort | Burlon, D. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We cross-matched the 6-year Swift/Burst Alert Telescope (BAT) survey of active galactic nuclei (AGN) with the AT20G radio survey of the southern sky, which is one of the largest high-frequency radio surveys available.With these datawe investigated the possible correlation between the radio and the X-ray emission at the highest radio and X-ray frequencies.We found 37AGNwith a high probability of association (>80 per cent), among which 19 are local Seyfert galaxies (with median redshift z=0.03) and 18 blazars.We found that˜20 per cent of theAGN detected in hard X-rays are also bright radio sources at 20 GHz, but the apparent correlation between the radio and hard X-ray luminosity is completely driven by the different median redshifts of the two subgroups of AGN. When we consider only the local Seyfert sample we find no evidence of a correlation between their 20 GHz and 15-55 keV power. Therefore it appears that at high frequencies the radio-X connection, which had been previously observed at lower frequencies, disappears. The disappearance of the radio-X correlation at high radio and X-ray frequencies could be tested through Very Long Baseline Interferometry and the use of the Nuclear Spectroscopic Telescope Array (NuSTAR) satellite. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. |
| first_indexed | 2025-11-14T10:22:35Z |
| format | Journal Article |
| id | curtin-20.500.11937-62516 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:22:35Z |
| publishDate | 2013 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-625162023-02-22T06:24:21Z The AT20G view of swift/BAT selected AGN: High-frequency radio waves meet hard X-rays Burlon, D. Ghirlanda, G. Murphy, T. Chhetri, Rajan Sadler, E. Ajello, M. We cross-matched the 6-year Swift/Burst Alert Telescope (BAT) survey of active galactic nuclei (AGN) with the AT20G radio survey of the southern sky, which is one of the largest high-frequency radio surveys available.With these datawe investigated the possible correlation between the radio and the X-ray emission at the highest radio and X-ray frequencies.We found 37AGNwith a high probability of association (>80 per cent), among which 19 are local Seyfert galaxies (with median redshift z=0.03) and 18 blazars.We found that˜20 per cent of theAGN detected in hard X-rays are also bright radio sources at 20 GHz, but the apparent correlation between the radio and hard X-ray luminosity is completely driven by the different median redshifts of the two subgroups of AGN. When we consider only the local Seyfert sample we find no evidence of a correlation between their 20 GHz and 15-55 keV power. Therefore it appears that at high frequencies the radio-X connection, which had been previously observed at lower frequencies, disappears. The disappearance of the radio-X correlation at high radio and X-ray frequencies could be tested through Very Long Baseline Interferometry and the use of the Nuclear Spectroscopic Telescope Array (NuSTAR) satellite. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. 2013 Journal Article http://hdl.handle.net/20.500.11937/62516 10.1093/mnras/stt343 Oxford University Press unknown |
| spellingShingle | Burlon, D. Ghirlanda, G. Murphy, T. Chhetri, Rajan Sadler, E. Ajello, M. The AT20G view of swift/BAT selected AGN: High-frequency radio waves meet hard X-rays |
| title | The AT20G view of swift/BAT selected AGN: High-frequency radio waves meet hard X-rays |
| title_full | The AT20G view of swift/BAT selected AGN: High-frequency radio waves meet hard X-rays |
| title_fullStr | The AT20G view of swift/BAT selected AGN: High-frequency radio waves meet hard X-rays |
| title_full_unstemmed | The AT20G view of swift/BAT selected AGN: High-frequency radio waves meet hard X-rays |
| title_short | The AT20G view of swift/BAT selected AGN: High-frequency radio waves meet hard X-rays |
| title_sort | at20g view of swift/bat selected agn: high-frequency radio waves meet hard x-rays |
| url | http://hdl.handle.net/20.500.11937/62516 |