Monitoring of active galactic nuclei. I - The quasars 1302 - 102 and 1217 + 023

N. Jackson, P. T. O'Brien, M. Goad, D. Alloin, D. J. Axon, A. G. de Bruyn, J. Clavel, M. Dietrich, P. M. Gondhalekar, E. van Groningen, W. Kollatschny, E. Laurikainen, A. Lawrence, I. M. McHardy, M. V. Penston, E. Perez, I. Perez-Fournon, A. Robinson, G. M. Stirpe, C. N. TadhunterR. J. Terlevich, S. Wagner

Research output: Contribution to journalArticlepeer-review


We present the results of a five-month spectroscopic monitoring campaign of two radio loud quasars, PKS 1217 + 023 and PKS 1302 - 102. There is a pronounced lack of variability in 1302 - 102 apart from a possible small change in the continuum level near the end of the monitoring period, but 1217 + 023 underwent a 20 percent continuum decrease in the middle of the campaign. No line variability at all was observed. The coadded data represent two of the best spectra yet obtained of any radio loud quasar other than 3C 273, and the shape of the H-beta line and the presence underneath it of other contaminating lines are well determined. We find that the H-beta broad line in 1302 - 102 is redshifted by 3 A with respect to the narrow line region, and find evidence for a separate broad H-beta feature on top of the main H-beta emission in both quasars. This feature is stronger in 1217 + 023 than in 1302 - 102. We discuss the implications of these results for geometries of the broad line region and for quasar classification schemes.
Original languageEnglish
Pages (from-to)17-25
JournalAstronomy and Astrophysics
Publication statusPublished - 1 Aug 1992


  • Active Galactic Nuclei
  • Emission Spectra
  • Quasars
  • Seyfert Galaxies
  • H Lines
  • Line Spectra


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