Monitoring of active galacitc nuclei. 4: The Seyfert 1 galaxy NGC 4593

M. Dietrich, W. Kollatschny, D. Alloin, I. Aretxaga, D. Axon, A. G. de Bruyn, J. Clavel, M. R. Goad, P. Gondhalekar, E. van Groningen, K. Horne, N. Jackson, E. Laurikainen, A. Lawrence, J. Masegosa, M. Moles, P. O'Brien, A. del Olmo, M. V. Penston, J. PereaE. Perez, I. Perez-Fournon, J. J. Perry, B. M. Peterson, A. Robinson, J. M. Rodriguez Espinosa, G. M. Stirpe, C. Tadhunter, R. Terlevich, S. Unger, S. J. Wagner, I. Wanders, R. Williams

Research output: Contribution to journalArticlepeer-review


Results of a five-month campaign of optical monitoring the Seyfert 1 galaxy NGC 4593 are presented. High resolution H-alpha and H-Beta spectra and direct images in the Johnson U, B, V, R, and I bands were obtained between January and June 1990. The emission lines and the continuum showed strong variations on time scales of weeks to days. The H-alpha line varied by more than 30% within only 5 days. Cross-correlating the light curves of the Balmer lines with that of the optical continuum gives a lag of around 4 days. Therefore, this low luminosity Seyfert galaxy may have one of the smallest broad line regions (BLRs) known so far.
Original languageEnglish
Pages (from-to)33-43
JournalAstronomy and Astrophysics
Publication statusPublished - 1 Apr 1994


  • Active Galactic Nuclei
  • Balmer Series
  • H Alpha Line
  • H Beta Line
  • Light Curve
  • Seyfert Galaxies
  • Astronomical Photometry
  • Cross Correlation
  • Optical Emission Spectroscopy
  • Time Series Analysis


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