A Counterjet in the Nucleus of Centaurus A
| Autor: | D. L. Jones, S. J. Tingay, R. A. Preston, D. L. Jauncey, J. E. Reynolds, J. E. J. Lovell, P. M. McCulloch, A. K. Tzioumis, M. E. Costa, D. W. Murphy, D. L. Meier, R. W. Clay, P. G. Edwards, S. P. Ellingsen, R. H. Ferris, R. G. Gough, P. Harbison, P. A. Jones, E. A. King, A. J. Kemball, V. Migenes, G. D. Nicolson, M. W. Sinclair, T. D. van Ommen, R. M. Wark, G. L. White |
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| Rok vydání: | 1996 |
| Předmět: |
Physics
Jet (fluid) Galactic astronomy Radio galaxy Astrophysics::High Energy Astrophysical Phenomena Centaurus A Astronomy Torus Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Luminosity medicine.anatomical_structure Very-long-baseline interferometry medicine Nucleus Astrophysics::Galaxy Astrophysics |
| Zdroj: | Extragalactic Radio Sources ISBN: 9780792341222 |
| DOI: | 10.1007/978-94-009-0295-4_8 |
| Popis: | Centaurus A (NGC 5128) is the nearest giant radio galaxy. It is a Fanaroff-Riley type 1 (low luminosity) radio source, but the compact radio source in the nucleus is strong enough that VLBI imaging has been possible with both the SHEVE array and the VLBA at several frequencies. These observations have detected a sub-parsec scale counterjet. This shows that jet formation in at least some FR I sources is intrinsically two-sided over very small distances and the radio jets in Centaurus A are probably only moderately relativistic. We also find evidence that the center of activity in Centaurus A is partially obscured by a disk or torus of dense plasma. |
| Databáze: | OpenAIRE |
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