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Episodic ejection from super-massive black holes

  • Lakshmi Saripalli (a1), Ravi Subrahmanyan (a1) and Richard W. Hunstead (a2)
Abstract
Abstract

Episodic activity in super-massive black holes is shown by radio galaxies exhibiting ‘double-double’ radio morphologies (Subrahmanyan et al. 1996, Schoenmakers et al. 2000). Spectacular examples showing a renewal of beam activity in the form of new beams emerging within relic radio lobes of previous activity have placed the phenomenon of recurrence in AGN outflows on a firm footing.

By using the SUMSS and WENSS GRG samples, we infer that on timescales of order a few million years, low luminosity radio sources are more likely to exhibit episodic behaviour in the accretion on to their supermassive black holes as compared to the more powerful radio galaxies.

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References
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Lara L., Cotton W. D., Feretti L., Giovannini G., Marcaide J. M., Marquez I. & Venturi T. 2001, A&A, 370, 409
Machalski J., Jamrozy M. & Zola S. 2001, A&A, 371, 445
Marchesini D., Celotti A. & Ferrarese L. 2004, MNRAS, 351, 733
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Schoenmakers A. P., de Bruyn A. G., Roettgering H. J. A. & van der Laan H. 2001, A&A, 374, 861
Schoenmakers A. P., de Bruyn A. G., Roettgering H. J. A., van der Laan H. & Kaiser C. R. 2000, MNRAS, 315, 371
Subrahmanyan R., Saripalli L. & Hunstead R. W. 1996, MNRAS, 279, 257
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Proceedings of the International Astronomical Union
  • ISSN: 1743-9213
  • EISSN: 1743-9221
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
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