Bibcode
Jackson, N.; O'Brien, P. T.; Goad, M.; Alloin, D.; Axon, D. J.; de Bruyn, A. G.; Clavel, J.; Dietrich, M.; Gondhalekar, P. M.; van Groningen, E.; Kollatschny, W.; Laurikainen, E.; Lawrence, A.; McHardy, I. M.; Penston, M. V.; Perez, E.; Perez-Fournon, I.; Robinson, A.; Stirpe, G. M.; Tadhunter, C. N.; Terlevich, R. J.; Wagner, S.
Referencia bibliográfica
Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 1, p. 17-25.
Fecha de publicación:
8
1992
Número de citas
19
Número de citas referidas
15
Descripción
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.