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• W2803692333 abstract "We investigate the relationships between Mg ii λ2798 emission line properties, as well as between these properties and inclination angle and Fe ii strength, in a lobe-dominated quasar sample. We find no correlation between Mg ii line width and inclination, unlike previous studies of the general quasar population. This suggests that the Mg ii emission region in these objects is not of a thin disk geometry; however, the average equivalent width (EW) of the line negates a spherical alternative. A positive correlation between Mg ii EW and inclination cannot be ruled out, meaning there is no strong evidence that Mg ii emission is anisotropic. Since thin disk emission would be highly directional, the geometric implications of these two findings are compatible. The lack of line width correlation with inclination may also indicate that Mg ii is useful for estimating black hole masses in lobe-dominated quasar samples, since it is unbiased by orientation. Some quasars in our sample have almost edge-on viewing angles and therefore cannot have a smooth toroidal obscurer co-planar with the accretion disk. Alternatives may be a distorted dusty disk or a clumpy obscurer. This could result from the sample selection bias toward high inclination objects, rather than intrinsic differences between lobe-dominated and typical quasars. Five objects have visible [O iii], allowing EW calculation and revealing it to be higher than in typical quasars. Since these objects are of high inclination, this finding supports the positive correlation between [O iii] EW and inclination found in a previous study." @default.
• W2803692333 created "2018-06-01" @default.
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• W2803692333 date "2018-07-02" @default.
• W2803692333 modified "2023-09-25" @default.
• W2803692333 title "Mg ii Line Properties in Lobe-dominated Quasars" @default.
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• W2803692333 doi "https://doi.org/10.3847/1538-4357/aac5ed" @default.
• W2803692333 hasPublicationYear "2018" @default.
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