ar X iv : a st ro - p h / 97 05 05 3 v 1 8 M ay 1 99 7 Spectropolarimetry of FIRST 0840 + 3633
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We present Keck spectropolarimetry of a rare “Iron LoBALQSO,” FIRST 0840+3633. The continuum is ∼4% polarized near 2000Å rest-frame, but falls to ∼2% at longer wavelengths, and maintains a relatively constant position angle of 50. The emission lines are unpolarized. The polarization increases up to ∼8% in the low-ionization absorption troughs of Mg II λ2800 and Al III λ1860. The polarization and its position angle vary in a complicated manner across the metastable Fe II absorption lines, suggesting that more than one mechanism is at work or that the system geometry is complex.
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تاریخ انتشار 1997