Saved in:
| Main Authors: | , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2401.06698 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866929264392142848 |
|---|---|
| author | E., Nokhrina E. B, Pushkarev A. |
| author_facet | E., Nokhrina E. B, Pushkarev A. |
| contents | The core shift method is a powerful method to estimate the physical parameters in relativistic jets from active galactic nuclei. The classical approach assumes a conical geometry of a jet and a constant plasma speed. However, recent observations showed that neither may hold close to the central engine, where plasma in a jet is effectively accelerating, and the jet geometry is quasi-parabolic. We modify the classical core shift method to account for these jet properties. We show that the core shift index may assume values in the range 0.8-1.2 or 0.53-0.8 depending on the jet geometry and viewing angle, with the indices close to both values are indeed being observed. We obtain the expressions to estimate jet magnetic field and a total magnetic flux in a jet. We show that the obtained magnetic field value can be easily recalculated down to the gravitational radius scales. For M 87 and NGC 315 these values are in good agreement with the ones obtained by different methods. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_06698 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Core shift in parabolic accelerating jets E., Nokhrina E. B, Pushkarev A. High Energy Astrophysical Phenomena The core shift method is a powerful method to estimate the physical parameters in relativistic jets from active galactic nuclei. The classical approach assumes a conical geometry of a jet and a constant plasma speed. However, recent observations showed that neither may hold close to the central engine, where plasma in a jet is effectively accelerating, and the jet geometry is quasi-parabolic. We modify the classical core shift method to account for these jet properties. We show that the core shift index may assume values in the range 0.8-1.2 or 0.53-0.8 depending on the jet geometry and viewing angle, with the indices close to both values are indeed being observed. We obtain the expressions to estimate jet magnetic field and a total magnetic flux in a jet. We show that the obtained magnetic field value can be easily recalculated down to the gravitational radius scales. For M 87 and NGC 315 these values are in good agreement with the ones obtained by different methods. |
| title | Core shift in parabolic accelerating jets |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2401.06698 |