The intra-hour variable quasar J1819+3845: 13-year evolution, jet polarization structure and interstellar scattering screen properties
We examine the long-term evolution of the intra-hour variable quasar, J1819+3845, whose variations have been attributed to interstellar scintillation by extremely local turbulent plasma, located only 1–3 pc from Earth. The variations in this source ceased some time in the period between June 2006 an...
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| Format: | Journal Article |
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EDP Sciences
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/7954 |
| _version_ | 1848745517620658176 |
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| author | de Bruyn, A. Macquart, Jean-Pierre |
| author_facet | de Bruyn, A. Macquart, Jean-Pierre |
| author_sort | de Bruyn, A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We examine the long-term evolution of the intra-hour variable quasar, J1819+3845, whose variations have been attributed to interstellar scintillation by extremely local turbulent plasma, located only 1–3 pc from Earth. The variations in this source ceased some time in the period between June 2006 and February 2007. The evolution of the source spectrum and the long-term lightcurve, and the persistent compactness of the source VLBI structure indicate that the cessation of rapid variability was associated with the passage of the scattering material out of the line of sight to the quasar. We present an extensive analysis on the linear polarization variations and their relation to total intensity variations. The proper motion of polarized features in the quasar jet is found to be sub-luminal. Systematic time delays between Stokes I, Q and U, in combination with the structure of the source obtained from 8.4 GHz VLBI data confirm the estimate of the screen distance: 1–2 pc, making the screen one of the nearest objects to the Solar system. |
| first_indexed | 2025-11-14T06:18:37Z |
| format | Journal Article |
| id | curtin-20.500.11937-7954 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:18:37Z |
| publishDate | 2015 |
| publisher | EDP Sciences |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-79542017-09-13T14:38:33Z The intra-hour variable quasar J1819+3845: 13-year evolution, jet polarization structure and interstellar scattering screen properties de Bruyn, A. Macquart, Jean-Pierre Radiation mechanisms Scattering individual high angular resolution non-thermal Galaxies Techniques active J1819+3845 Quasars We examine the long-term evolution of the intra-hour variable quasar, J1819+3845, whose variations have been attributed to interstellar scintillation by extremely local turbulent plasma, located only 1–3 pc from Earth. The variations in this source ceased some time in the period between June 2006 and February 2007. The evolution of the source spectrum and the long-term lightcurve, and the persistent compactness of the source VLBI structure indicate that the cessation of rapid variability was associated with the passage of the scattering material out of the line of sight to the quasar. We present an extensive analysis on the linear polarization variations and their relation to total intensity variations. The proper motion of polarized features in the quasar jet is found to be sub-luminal. Systematic time delays between Stokes I, Q and U, in combination with the structure of the source obtained from 8.4 GHz VLBI data confirm the estimate of the screen distance: 1–2 pc, making the screen one of the nearest objects to the Solar system. 2015 Journal Article http://hdl.handle.net/20.500.11937/7954 10.1051/0004-6361/201220522 EDP Sciences fulltext |
| spellingShingle | Radiation mechanisms Scattering individual high angular resolution non-thermal Galaxies Techniques active J1819+3845 Quasars de Bruyn, A. Macquart, Jean-Pierre The intra-hour variable quasar J1819+3845: 13-year evolution, jet polarization structure and interstellar scattering screen properties |
| title | The intra-hour variable quasar J1819+3845: 13-year evolution, jet polarization structure and interstellar scattering screen properties |
| title_full | The intra-hour variable quasar J1819+3845: 13-year evolution, jet polarization structure and interstellar scattering screen properties |
| title_fullStr | The intra-hour variable quasar J1819+3845: 13-year evolution, jet polarization structure and interstellar scattering screen properties |
| title_full_unstemmed | The intra-hour variable quasar J1819+3845: 13-year evolution, jet polarization structure and interstellar scattering screen properties |
| title_short | The intra-hour variable quasar J1819+3845: 13-year evolution, jet polarization structure and interstellar scattering screen properties |
| title_sort | intra-hour variable quasar j1819+3845: 13-year evolution, jet polarization structure and interstellar scattering screen properties |
| topic | Radiation mechanisms Scattering individual high angular resolution non-thermal Galaxies Techniques active J1819+3845 Quasars |
| url | http://hdl.handle.net/20.500.11937/7954 |