Astrophysics and Space Science

, Volume 201, Issue 2, pp 297–302 | Cite as

NGC 4151 entering in an active phase

  • P. -E. Christopoulou
  • C. D. Goudis
  • N. Solomos
  • S. Kemp
Article
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Abstract

Photometric observations of the nucleus of NGC 4151 obtained in a period of 16 nights in April 1990 in the 5672 Å continuum and theU-band have clearly shown that the nucleus has entered into an active phase and its energy output is still rising.

Keywords

Active Phase Energy Output Photometric Observation 

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References

  1. Carral, P., Turner, J. L., and Ho, P. T. P.: 1990,Astrophys. J. 362, 434.Google Scholar
  2. Ebstein, S. M., Carleton, N. P., and Papaliolios, C.: 1989,Astrophys. J. 336, 103.Google Scholar
  3. Harrison, B., Pedlar, A., Unger, S. W.et al.: 1986,Monthly Notices Roy. Astron. Soc. 218, 775.Google Scholar
  4. Kachikian, E. Y. and Weedman, D. M.: 1974,Astrophys. J. 192, 581.Google Scholar
  5. Maoz, D., Netzer, H., Mazeh, T.et al.: 1991,Astrophys. J. 367, 493.Google Scholar
  6. Meaburn, J., Ohtani, H., and Goudis, D. C.: 1985, in J. E. Dyson (ed.),Active Galactic Nuclei, Manchester University Press, Manchester, p. 184.Google Scholar
  7. Penston, M. J., Penston, M. V., and Sandage, A.: 1971,Publ. Astron. Soc. Pacific 83, 783.Google Scholar
  8. Penston, M. V., Robinson, A., Alloin, D.et al.: 1990,Astron. Astrophys. 236, 53.Google Scholar
  9. Pérez, E., González-Delgado, R., Tadhunter, C., and Tsvetanov, Z.: 1989,Monthly Notices Roy. Astron. Soc. 214, 31p.Google Scholar
  10. Schulz, H.: 1990, Astron. J.99, 1442.Google Scholar
  11. Schwarzschild, M.: 1973,Astrophys. J. 182, 357.Google Scholar
  12. Simkin, S. M.: 1975,Astrophys. J. 200, 567.Google Scholar
  13. Solomos, N., Whitehead, M. J., Meaburn, J., Goudis, C. D., and Christopoulou, P. E.: 1990,Astron. Astrophys. 229, 80.Google Scholar

Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • P. -E. Christopoulou
    • 1
  • C. D. Goudis
    • 1
  • N. Solomos
    • 1
  • S. Kemp
    • 1
  1. 1.Astronomical Laboratory, Department of PhysicsUniversity of PatrasGreece

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