Abstract
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.
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Gaskell, C.M. (1988). Double peaked broad line profiles — edge on accretion disks or double quasar nuclei?. In: Miller, H.R., Wiita, P.J. (eds) Active Galactic Nuclei. Lecture Notes in Physics, vol 307. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-19492-4_168
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DOI: https://doi.org/10.1007/3-540-19492-4_168
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