High-frequency very long baseline interferometry studies of NRAO 530
文献类型：期刊论文
| 作者 | Lu, R. -S.1,2; Krichbaum, T. P.1; Zensus, J. A.1 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2011-12-01 |
| 卷号 | 418期号:4页码:2260-2272 |
| 关键词 | galaxies: jets quasars: individual: NRAO 530 radio continuum: galaxies |
| 英文摘要 | NRAO 530 is an optically violent variable source and has been studied with multi-epoch multifrequency high-resolution very long baseline interferometry (VLBI) observations. NRAO 530 was monitored with the Very Long Baseline Array (VLBA) at three frequencies (22, 43 and 86 GHz) on 10 consecutive days in 2007 May during observations of the Galactic Centre (Sgr A*). Furthermore, analysis of archival data of NRAO 530 at 15 GHz over the last 10 years allows us to study its detailed jet kinematics. We identified the compact component located at the southern-end of the jet as the VLBI core, consistent with previous studies. The 10-d monitoring data at the three high frequencies were shown to produce high-quality and self-consistent measurements of the component positions, from which we detected for the first time a two-dimensional frequency-dependent position shift. In addition, the repeated measurements also permit us to investigate the interday flux density and structure variability of NRAO 530. We find that it is more variable for the inner jet components than those further out. We obtained apparent velocities for eight jet components with beta(app) ranging from 2 to 26c. Accordingly, we estimated physical jet parameters with the minimum Lorentz factor of 14 and Doppler factors in the range of 14-28 (component f). The changes in the morphology of NRAO 530 were related to the motion of separate jet components with the most pronounced changes occurring in the regions close to the core. For NRAO 530, we estimated a position angle swing of 3.4 per year for the entire inner jet (components d and e). The non-ballistic motion and change of jet orientation make this source another prominent example of a helical and possibly swinging jet. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | ACTIVE GALACTIC NUCLEI ; EXTRAGALACTIC RADIO-SOURCES ; VLBI OBSERVATIONS ; PARSEC-SCALE ; X-RAY ; RELATIVISTIC JETS ; VARIABLE SOURCES ; PRECESSING JET ; BL-LACERTAE ; BLACK-HOLE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000298088100012 |
| 源URL | [http://119.78.226.72/handle/331011/28098]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Max Planck Inst Radioastron, D-53121 Bonn, Germany 2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lu, R. -S.,Krichbaum, T. P.,Zensus, J. A.. High-frequency very long baseline interferometry studies of NRAO 530[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,418(4):2260-2272. |
| APA | Lu, R. -S.,Krichbaum, T. P.,&Zensus, J. A..(2011).High-frequency very long baseline interferometry studies of NRAO 530.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,418(4),2260-2272. |
| MLA | Lu, R. -S.,et al."High-frequency very long baseline interferometry studies of NRAO 530".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 418.4(2011):2260-2272. |
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来源：上海天文台
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