Anomalous Narrow-line Quasars

Details Anomalous Narrow-line Quasars Anomalous Narrow-line Quasars

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21920901s&link_type=abstract

American Astronomical Society, AAS Meeting #219, #209.01

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Scientific paper

Anomalous narrow-line quasars are a new class of Type I quasars with narrow Hβ broader than 1200 km/s, above the velocity believed possible for gas in the quasar narrow-line region. This broadening is tightly correlated with changes in other spectral features, so that the set of ANLs is a distinct population difficult to explain with the current quasar standard model. Further, ANLs comprise over one quarter of all quasars at 0.2 < z < 0.8, so they must be accounted for as part of our understanding of supermassive black hole evolution. Because other quasar narrow lines such as [O II] are diminished or disappear entirely, ANLs raise several fundamental questions about the connection between the black hole and the central region of the galaxy. They also appear inconsistent with a predominantly virial broad-line region, calling into question the technique of virial mass estimation.

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