A Dense Plasma Globule in the Solar Neighborhood
© 2017. The American Astronomical Society. All rights reserved. The radio source J1819+3845 underwent a period of extreme interstellar scintillation between circa 1999 and 2007. The plasma structure responsible for this scintillation was determined to be just 1-3 pc from the solar system and to poss...
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| Format: | Journal Article |
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Institute of Physics Publishing
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/58245 |
| _version_ | 1848760211458752512 |
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| author | Vedantham, H. Bruyn, A. Macquart, Jean-Pierre |
| author_facet | Vedantham, H. Bruyn, A. Macquart, Jean-Pierre |
| author_sort | Vedantham, H. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2017. The American Astronomical Society. All rights reserved. The radio source J1819+3845 underwent a period of extreme interstellar scintillation between circa 1999 and 2007. The plasma structure responsible for this scintillation was determined to be just 1-3 pc from the solar system and to posses a density of n e ~ 10 2 cm -3 , which is three orders of magnitude higher than the ambient interstellar density. Here we present radio-polarimetric images of the field toward J1819+3845 at wavelengths of 0.2, 0.92, and 2 m. We detect an elliptical plasma globule of approximate size 1° × ?2° (major-axis position angle of ˜-40°), via its Faraday-rotation imprint (˜15 rad m -2 ) on the diffuse Galactic synchrotron emission. The extreme scintillation of J1819+3845 was most likely caused at the turbulent boundary of the globule (J1819+3845 is currently occulted by the globule). The origin and precise nature of the globule remain unknown. Our observations represent the first time that plasma structures which likely cause extreme scintillation have been directly imaged. |
| first_indexed | 2025-11-14T10:12:10Z |
| format | Journal Article |
| id | curtin-20.500.11937-58245 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:12:10Z |
| publishDate | 2017 |
| publisher | Institute of Physics Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-582452018-03-29T09:08:39Z A Dense Plasma Globule in the Solar Neighborhood Vedantham, H. Bruyn, A. Macquart, Jean-Pierre © 2017. The American Astronomical Society. All rights reserved. The radio source J1819+3845 underwent a period of extreme interstellar scintillation between circa 1999 and 2007. The plasma structure responsible for this scintillation was determined to be just 1-3 pc from the solar system and to posses a density of n e ~ 10 2 cm -3 , which is three orders of magnitude higher than the ambient interstellar density. Here we present radio-polarimetric images of the field toward J1819+3845 at wavelengths of 0.2, 0.92, and 2 m. We detect an elliptical plasma globule of approximate size 1° × ?2° (major-axis position angle of ˜-40°), via its Faraday-rotation imprint (˜15 rad m -2 ) on the diffuse Galactic synchrotron emission. The extreme scintillation of J1819+3845 was most likely caused at the turbulent boundary of the globule (J1819+3845 is currently occulted by the globule). The origin and precise nature of the globule remain unknown. Our observations represent the first time that plasma structures which likely cause extreme scintillation have been directly imaged. 2017 Journal Article http://hdl.handle.net/20.500.11937/58245 10.3847/2041-8213/aa8f92 Institute of Physics Publishing restricted |
| spellingShingle | Vedantham, H. Bruyn, A. Macquart, Jean-Pierre A Dense Plasma Globule in the Solar Neighborhood |
| title | A Dense Plasma Globule in the Solar Neighborhood |
| title_full | A Dense Plasma Globule in the Solar Neighborhood |
| title_fullStr | A Dense Plasma Globule in the Solar Neighborhood |
| title_full_unstemmed | A Dense Plasma Globule in the Solar Neighborhood |
| title_short | A Dense Plasma Globule in the Solar Neighborhood |
| title_sort | dense plasma globule in the solar neighborhood |
| url | http://hdl.handle.net/20.500.11937/58245 |