期刊
ASTRONOMY & ASTROPHYSICS
卷 654, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202039423
关键词
galaxies; active; galaxies; jets; quasars; individual; 3C 273
资金
- Spanish Ministerio de Economia y Competitividad [AYA2016-80889-P, PID2019-108995GBC21]
- Consejeria de Economia, Conocimiento, Empresas y Universidad of the Junta de Andalucia [P18-FR-1769]
- Consejo Superior de Investigaciones Cientificas [2019AEP112]
- State Agency for Research of the Spanish MCIU through the Center of Excellence Severo Ochoa awardfor the Instituto de Astrofisica de Andalucia [SEV-2017-0709]
- Russian Science Foundation [20-62-46021]
- Academy of Finland [274477, 315721]
- Spanish Ministerio de Ciencia e Innovacion (MICINN) [PID2019-105510GB-C31]
- Spanish Ministry of Science [PID2019-107427GB-C33, AYA2016-77237-C3-3-P]
- Generalitat Valenciana [PROMETEU/2019/071]
- German Research Foundation [HE5937/2-2]
- CSIRO Distinguished Visitor Programme
- Roscosmos State Corporation
- European Union [730562]
- Australian Government
- Russian Science Foundation [20-62-46021] Funding Source: Russian Science Foundation
Space-VLBI RadioAstron observations of flat spectrum radio quasar 3C 273 at 1.6 GHz and 4.8 GHz revealed limb-brightening in the jet at the lower frequency and emission from a central stream of plasma at the higher frequency, indicating a stratification in the emitting electron energy distribution. Future numerical simulations will help determine the physical parameters needed to reproduce the observed jet structure.
We present Space-VLBI RadioAstron observations at 1.6 GHz and 4.8 GHz of the flat spectrum radio quasar 3C 273, with detections on baselines up to 4.5 and 3.3 Earth Diameters, respectively. Achieving the best angular resolution at 1.6 GHz to date, we have imaged limb-brightening in the jet, not previously detected in this source. In contrast, at 4.8 GHz, we detected emission from a central stream of plasma, with a spatial distribution complementary to the limb-brightened emission, indicating an origin in the spine of the jet. While a stratification across the jet width in the flow density, internal energy, magnetic field, or bulk flow velocity are usually invoked to explain the limb-brightening, the different jet structure detected at the two frequencies probably requires a stratification in the emitting electron energy distribution. Future dedicated numerical simulations will allow the determination of which combination of physical parameters are needed to reproduce the spine-sheath structure observed by Space-VLBI with RadioAstron in 3C 273.
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