Double peaked broad line profiles — edge on accretion disks or double quasar nuclei?

  • C. Martin Gaskell
I. Spectral Studies in the Optical, Ultraviolet and Infrared
Part of the Lecture Notes in Physics book series (LNP, volume 307)


It is pointed out that a significant fraction (over 50%) of quasars do not show smooth symmetric “logarithmic” broad line profiles, but instead show double broad line peaks, usually unequal in brightness, always one blueshifted and one redshifted relative to the systemic velocity. The problems with the former explanations of obscuration effects or variability are summarized and the case is made for there being two active objects in these galactic nuclei. It is argued that line variability data (and other considerations) firmly rule out the recently suggested alternative hypothesis that these double peaked broad line objects are due to edge on accretion discs.


Black Hole Line Profile Accretion Disc Broad Line Balmer Line 


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Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • C. Martin Gaskell
    • 1
  1. 1.Astronomy Department, Dennison BuildingUniversity of MichiganAnn Arbor

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