FINE-SCALE STRUCTURE OF THE QUASAR 3C 279 MEASURED WITH 1.3 mm VERY LONG BASELINE INTERFEROMETRY
We report results from five day very long baseline interferometry observations of the well-known quasar 3C 279 at 1.3 mm (230 GHz) in 2011. The measured nonzero closure phases on triangles including stations in Arizona, California, and Hawaii indicate that the source structure is spatially resolved....
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | en_US |
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IOP Publishing
2015
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| Online Access: | http://hdl.handle.net/1721.1/94539 |
| _version_ | 1826206235450408960 |
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| author | Lu, Rusen Fish, Vincent L. Doeleman, Sheperd Samuel Crew, Geoffrey B. Cappallo, Roger J. Titus, Michael A. |
| author2 | Haystack Observatory |
| author_facet | Haystack Observatory Lu, Rusen Fish, Vincent L. Doeleman, Sheperd Samuel Crew, Geoffrey B. Cappallo, Roger J. Titus, Michael A. |
| author_sort | Lu, Rusen |
| collection | MIT |
| description | We report results from five day very long baseline interferometry observations of the well-known quasar 3C 279 at 1.3 mm (230 GHz) in 2011. The measured nonzero closure phases on triangles including stations in Arizona, California, and Hawaii indicate that the source structure is spatially resolved. We find an unusual inner jet direction at scales of ~1 pc extending along the northwest-southeast direction (P.A. = 127° ± 3°), as opposed to other (previously) reported measurements on scales of a few parsecs showing inner jet direction extending to the southwest. The 1.3 mm structure corresponds closely with that observed in the central region of quasi-simultaneous super-resolution Very Long Baseline Array images at 7 mm. The closure phase changed significantly on the last day when compared with the rest of observations, indicating that the inner jet structure may be variable on daily timescales. The observed new direction of the inner jet shows inconsistency with the prediction of a class of jet precession models. Our observations indicate a brightness temperature of ~8 × 10[superscript 10] K in the 1.3 mm core, much lower than that at centimeter wavelengths. Observations with better uv coverage and sensitivity in the coming years will allow the discrimination between different structure models and will provide direct images of the inner regions of the jet with 20-30 μas (5-7 light months) resolution. |
| first_indexed | 2024-09-23T13:26:14Z |
| format | Article |
| id | mit-1721.1/94539 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:26:14Z |
| publishDate | 2015 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/945392022-10-01T15:16:02Z FINE-SCALE STRUCTURE OF THE QUASAR 3C 279 MEASURED WITH 1.3 mm VERY LONG BASELINE INTERFEROMETRY Lu, Rusen Fish, Vincent L. Doeleman, Sheperd Samuel Crew, Geoffrey B. Cappallo, Roger J. Titus, Michael A. Haystack Observatory Lu, Rusen Fish, Vincent L. Doeleman, Sheperd Samuel Crew, Geoffrey B. Cappallo, Roger J. Titus, Michael A. We report results from five day very long baseline interferometry observations of the well-known quasar 3C 279 at 1.3 mm (230 GHz) in 2011. The measured nonzero closure phases on triangles including stations in Arizona, California, and Hawaii indicate that the source structure is spatially resolved. We find an unusual inner jet direction at scales of ~1 pc extending along the northwest-southeast direction (P.A. = 127° ± 3°), as opposed to other (previously) reported measurements on scales of a few parsecs showing inner jet direction extending to the southwest. The 1.3 mm structure corresponds closely with that observed in the central region of quasi-simultaneous super-resolution Very Long Baseline Array images at 7 mm. The closure phase changed significantly on the last day when compared with the rest of observations, indicating that the inner jet structure may be variable on daily timescales. The observed new direction of the inner jet shows inconsistency with the prediction of a class of jet precession models. Our observations indicate a brightness temperature of ~8 × 10[superscript 10] K in the 1.3 mm core, much lower than that at centimeter wavelengths. Observations with better uv coverage and sensitivity in the coming years will allow the discrimination between different structure models and will provide direct images of the inner regions of the jet with 20-30 μas (5-7 light months) resolution. National Science Foundation (U.S.) 2015-02-17T13:46:59Z 2015-02-17T13:46:59Z 2013-06 2013-01 Article http://purl.org/eprint/type/JournalArticle 0004-637X 1538-4357 http://hdl.handle.net/1721.1/94539 Lu, Ru-Sen, Vincent L. Fish, Kazunori Akiyama, Sheperd S. Doeleman, Juan C. Algaba, Geoffrey C. Bower, Christiaan Brinkerink, et al. “FINE-SCALE STRUCTURE OF THE QUASAR 3C 279 MEASURED WITH 1.3 Mm VERY LONG BASELINE INTERFEROMETRY.” The Astrophysical Journal 772, no. 1 (June 28, 2013): 13. © 2013 The American Astronomical Society en_US http://dx.doi.org/10.1088/0004-637X/772/1/13 The Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing American Astronomical Society |
| spellingShingle | Lu, Rusen Fish, Vincent L. Doeleman, Sheperd Samuel Crew, Geoffrey B. Cappallo, Roger J. Titus, Michael A. FINE-SCALE STRUCTURE OF THE QUASAR 3C 279 MEASURED WITH 1.3 mm VERY LONG BASELINE INTERFEROMETRY |
| title | FINE-SCALE STRUCTURE OF THE QUASAR 3C 279 MEASURED WITH 1.3 mm VERY LONG BASELINE INTERFEROMETRY |
| title_full | FINE-SCALE STRUCTURE OF THE QUASAR 3C 279 MEASURED WITH 1.3 mm VERY LONG BASELINE INTERFEROMETRY |
| title_fullStr | FINE-SCALE STRUCTURE OF THE QUASAR 3C 279 MEASURED WITH 1.3 mm VERY LONG BASELINE INTERFEROMETRY |
| title_full_unstemmed | FINE-SCALE STRUCTURE OF THE QUASAR 3C 279 MEASURED WITH 1.3 mm VERY LONG BASELINE INTERFEROMETRY |
| title_short | FINE-SCALE STRUCTURE OF THE QUASAR 3C 279 MEASURED WITH 1.3 mm VERY LONG BASELINE INTERFEROMETRY |
| title_sort | fine scale structure of the quasar 3c 279 measured with 1 3 mm very long baseline interferometry |
| url | http://hdl.handle.net/1721.1/94539 |
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