Emergence and disappearance of microarcsecond structure in the scintillating quasar J1819+3845
The 4.8-GHz light curves of the scintillating intraday variable quasar J1819+3845 during 2004-2005 exhibit sharp structure, down to a time-scale of 15 min, that was absent from lightcurves taken prior to this period and from the 2006 light curves. Analysis of the light curve powerspectra show that t...
| Main Authors: | , |
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| Format: | Journal Article |
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Wiley-Blackwell Publishing Ltd.
2007
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| Online Access: | http://hdl.handle.net/20.500.11937/41593 |
| _version_ | 1848756187995045888 |
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| author | Macquart, Jean-pierre de Bruyn, A. |
| author_facet | Macquart, Jean-pierre de Bruyn, A. |
| author_sort | Macquart, Jean-pierre |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The 4.8-GHz light curves of the scintillating intraday variable quasar J1819+3845 during 2004-2005 exhibit sharp structure, down to a time-scale of 15 min, that was absent from lightcurves taken prior to this period and from the 2006 light curves. Analysis of the light curve powerspectra show that the variations must be due to the emergence of new structure in the source.The power spectra yield a scattering screen distance of 3.8 0.3 pc for a best-fitting vISS = 59 0.5 km s-1 or 2.0 0.3 pc for the scintillation velocity reported by Dennett-Thorpe & de Bruyn. The scattering medium is required to be exceptionally turbulent, with C2N 0.7L-1 pc m-20/3 for scattering material of thickness Lpc pc along the ray path. The 2004 power spectrum can be explained in terms of a double source with a component separation 240 15 as in 2004. |
| first_indexed | 2025-11-14T09:08:13Z |
| format | Journal Article |
| id | curtin-20.500.11937-41593 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:08:13Z |
| publishDate | 2007 |
| publisher | Wiley-Blackwell Publishing Ltd. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-415932017-09-13T16:05:06Z Emergence and disappearance of microarcsecond structure in the scintillating quasar J1819+3845 Macquart, Jean-pierre de Bruyn, A. quasars galaxies individual high angular resolution scattering active techniques J1819+3845 The 4.8-GHz light curves of the scintillating intraday variable quasar J1819+3845 during 2004-2005 exhibit sharp structure, down to a time-scale of 15 min, that was absent from lightcurves taken prior to this period and from the 2006 light curves. Analysis of the light curve powerspectra show that the variations must be due to the emergence of new structure in the source.The power spectra yield a scattering screen distance of 3.8 0.3 pc for a best-fitting vISS = 59 0.5 km s-1 or 2.0 0.3 pc for the scintillation velocity reported by Dennett-Thorpe & de Bruyn. The scattering medium is required to be exceptionally turbulent, with C2N 0.7L-1 pc m-20/3 for scattering material of thickness Lpc pc along the ray path. The 2004 power spectrum can be explained in terms of a double source with a component separation 240 15 as in 2004. 2007 Journal Article http://hdl.handle.net/20.500.11937/41593 10.1111/j.1745-3933.2007.00341.x Wiley-Blackwell Publishing Ltd. unknown |
| spellingShingle | quasars galaxies individual high angular resolution scattering active techniques J1819+3845 Macquart, Jean-pierre de Bruyn, A. Emergence and disappearance of microarcsecond structure in the scintillating quasar J1819+3845 |
| title | Emergence and disappearance of microarcsecond structure in the scintillating quasar J1819+3845 |
| title_full | Emergence and disappearance of microarcsecond structure in the scintillating quasar J1819+3845 |
| title_fullStr | Emergence and disappearance of microarcsecond structure in the scintillating quasar J1819+3845 |
| title_full_unstemmed | Emergence and disappearance of microarcsecond structure in the scintillating quasar J1819+3845 |
| title_short | Emergence and disappearance of microarcsecond structure in the scintillating quasar J1819+3845 |
| title_sort | emergence and disappearance of microarcsecond structure in the scintillating quasar j1819+3845 |
| topic | quasars galaxies individual high angular resolution scattering active techniques J1819+3845 |
| url | http://hdl.handle.net/20.500.11937/41593 |