23 GHz VLBI observations of SN 2008ax
We report on phase-referenced 23 GHz Very-Long-Baseline-Interferometry (VLBI) observations of the type IIb supernova SN 2008ax,made with the Very Long Baseline Array (VLBA) on 2 April 2008 (33 days after explosion). These observations resulted in a marginal detection of the supernova. The total flux...
| Main Authors: | , , , , , , , , , , |
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| Format: | Journal Article |
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EDP Sciences
2009
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| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/13133 |
| _version_ | 1848748266818109440 |
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| author | Marti-Vidal, I. Marcaide, J. Alberdi, A. Guirado, J. Prez-Torres, M. Ros, E. Shapiro, I. Beswick, R. Muxlow, T. Pedlar, A. Argo, Megan |
| author_facet | Marti-Vidal, I. Marcaide, J. Alberdi, A. Guirado, J. Prez-Torres, M. Ros, E. Shapiro, I. Beswick, R. Muxlow, T. Pedlar, A. Argo, Megan |
| author_sort | Marti-Vidal, I. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We report on phase-referenced 23 GHz Very-Long-Baseline-Interferometry (VLBI) observations of the type IIb supernova SN 2008ax,made with the Very Long Baseline Array (VLBA) on 2 April 2008 (33 days after explosion). These observations resulted in a marginal detection of the supernova. The total flux density recovered from our VLBI image is 0.8 0.3 mJy (one standard deviation). As it appears, the structure may be interpreted as either a core-jet or a double source. However, the supernova structure could be somewhat confused with a possible close by noise peak. In such a case, the recovered flux density would decrease to 0.480.12 mJy, compatible with the flux densities measured with the VLA at epochs close in time to our VLBI observations. The lowest average expansion velocities derived from our observations are (1.90±0.30) 105 km s-1 (case of a double source) and (5.2±1.3) 104 km s-1 (takingthe weaker source component as a spurious, close by, noise peak, which is the more likely interpretation). These velocities are 7.3 and 2 times higher, respectively, than the maximum ejecta velocity inferred from optical-line observations. |
| first_indexed | 2025-11-14T07:02:19Z |
| format | Journal Article |
| id | curtin-20.500.11937-13133 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:02:19Z |
| publishDate | 2009 |
| publisher | EDP Sciences |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-131332017-09-13T16:03:15Z 23 GHz VLBI observations of SN 2008ax Marti-Vidal, I. Marcaide, J. Alberdi, A. Guirado, J. Prez-Torres, M. Ros, E. Shapiro, I. Beswick, R. Muxlow, T. Pedlar, A. Argo, Megan galaxies radio continuum supernovae stars NGC 4490 SN 2008ax We report on phase-referenced 23 GHz Very-Long-Baseline-Interferometry (VLBI) observations of the type IIb supernova SN 2008ax,made with the Very Long Baseline Array (VLBA) on 2 April 2008 (33 days after explosion). These observations resulted in a marginal detection of the supernova. The total flux density recovered from our VLBI image is 0.8 0.3 mJy (one standard deviation). As it appears, the structure may be interpreted as either a core-jet or a double source. However, the supernova structure could be somewhat confused with a possible close by noise peak. In such a case, the recovered flux density would decrease to 0.480.12 mJy, compatible with the flux densities measured with the VLA at epochs close in time to our VLBI observations. The lowest average expansion velocities derived from our observations are (1.90±0.30) 105 km s-1 (case of a double source) and (5.2±1.3) 104 km s-1 (takingthe weaker source component as a spurious, close by, noise peak, which is the more likely interpretation). These velocities are 7.3 and 2 times higher, respectively, than the maximum ejecta velocity inferred from optical-line observations. 2009 Journal Article http://hdl.handle.net/20.500.11937/13133 10.1051/0004-6361/200912034 EDP Sciences fulltext |
| spellingShingle | galaxies radio continuum supernovae stars NGC 4490 SN 2008ax Marti-Vidal, I. Marcaide, J. Alberdi, A. Guirado, J. Prez-Torres, M. Ros, E. Shapiro, I. Beswick, R. Muxlow, T. Pedlar, A. Argo, Megan 23 GHz VLBI observations of SN 2008ax |
| title | 23 GHz VLBI observations of SN 2008ax |
| title_full | 23 GHz VLBI observations of SN 2008ax |
| title_fullStr | 23 GHz VLBI observations of SN 2008ax |
| title_full_unstemmed | 23 GHz VLBI observations of SN 2008ax |
| title_short | 23 GHz VLBI observations of SN 2008ax |
| title_sort | 23 ghz vlbi observations of sn 2008ax |
| topic | galaxies radio continuum supernovae stars NGC 4490 SN 2008ax |
| url | http://hdl.handle.net/20.500.11937/13133 |