The radio properties of radio-quiet quasars
Although radio-quiet quasars (RQQs) constitute >90% of optically-identified quasar samples their radio properties are only poorly understood. In this paper we present the results of a multi-frequency VLA study of 27 low-redshift RQQs. We detect radio emission from 20 objects, half of which ar...
| Main Authors: | , , , |
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| Format: | Journal article |
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1998
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| _version_ | 1797083399976910848 |
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| author | Kukula, M Dunlop, J Hughes, D Rawlings, S |
| author_facet | Kukula, M Dunlop, J Hughes, D Rawlings, S |
| author_sort | Kukula, M |
| collection | OXFORD |
| description | Although radio-quiet quasars (RQQs) constitute >90% of optically-identified quasar samples their radio properties are only poorly understood. In this paper we present the results of a multi-frequency VLA study of 27 low-redshift RQQs. We detect radio emission from 20 objects, half of which are unresolved (< 0.24''). In cases where significant structure can be resolved, double, triple and linear radio sources on scales of a few kpc are found. The radio emission (typically) has a steep spectrum (alpha ~ 0.7), and high brightness temperatures (T_B > 10^5 K) are measured in some of the radio components. The RQQs form a natural extension to the radio luminosity - absolute magnitude distribution of nearby Seyfert 1s. We conclude that a significant fraction of the radio emission in RQQs originates in a compact nuclear source directly associated with the quasar. There are no significant differences between the radio properties of RQQs with elliptical hosts and those in disc galaxies within the current sample. |
| first_indexed | 2024-03-07T01:41:15Z |
| format | Journal article |
| id | oxford-uuid:96ecec3d-6ca1-4bac-9d60-9f1d16a3d321 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T01:41:15Z |
| publishDate | 1998 |
| record_format | dspace |
| spelling | oxford-uuid:96ecec3d-6ca1-4bac-9d60-9f1d16a3d3212022-03-26T23:56:13ZThe radio properties of radio-quiet quasarsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:96ecec3d-6ca1-4bac-9d60-9f1d16a3d321Symplectic Elements at Oxford1998Kukula, MDunlop, JHughes, DRawlings, SAlthough radio-quiet quasars (RQQs) constitute >90% of optically-identified quasar samples their radio properties are only poorly understood. In this paper we present the results of a multi-frequency VLA study of 27 low-redshift RQQs. We detect radio emission from 20 objects, half of which are unresolved (< 0.24''). In cases where significant structure can be resolved, double, triple and linear radio sources on scales of a few kpc are found. The radio emission (typically) has a steep spectrum (alpha ~ 0.7), and high brightness temperatures (T_B > 10^5 K) are measured in some of the radio components. The RQQs form a natural extension to the radio luminosity - absolute magnitude distribution of nearby Seyfert 1s. We conclude that a significant fraction of the radio emission in RQQs originates in a compact nuclear source directly associated with the quasar. There are no significant differences between the radio properties of RQQs with elliptical hosts and those in disc galaxies within the current sample. |
| spellingShingle | Kukula, M Dunlop, J Hughes, D Rawlings, S The radio properties of radio-quiet quasars |
| title | The radio properties of radio-quiet quasars |
| title_full | The radio properties of radio-quiet quasars |
| title_fullStr | The radio properties of radio-quiet quasars |
| title_full_unstemmed | The radio properties of radio-quiet quasars |
| title_short | The radio properties of radio-quiet quasars |
| title_sort | radio properties of radio quiet quasars |
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