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- W2054403809 abstract "We present IUE and optical observations demonstrating that the z/sub em/ = 0.29 ZSO PG 1700+518 is a broad absorption line (BAL) QSO. This object is unique because of its low redshift and because it is one of only two BAL QSOs which exhibit moderate strength Mg II BALs. The discovery is noteworthy because, barring systematics between redshift and the strength of Mg II BALs in BAL QSOs, it suggests that the fraction of QSOs with BALs at low redshifts is comparable to the observed fraction at high redshifts. We discuss implications for the evolutionary history of the QSO and its BAL region (BALR). Optical spectroscopy of PG 1700+518 shows substantial Fe II emission, but little (if any) broad (O III) lambda 5007 emission. The lack of broad (O III) emission requires either BALR covering factors of q/sub c/ 10/sup 5/-10/sup 6/ m/sup -3/ for larger values of q/sub c/. The model we present for PG 1700+518 has a BALR-central source distance of r = 31(n/sub e//10/sup 6/)/sup -1/2/ pc. For the highest luminosity BAL QSOs, this distance scales to 10 or more times larger. We discuss why models with n/sub e/>10/sup 6/-10/sup 7/ cm/supmore » -3/ are favored.« less" @default.
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- W2054403809 date "1985-07-01" @default.
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- W2054403809 title "Observations of the low-redshift broad absorption line QSO PG 1700 + 518 - Limits on the fraction of QSOs with broad absorption lines at low redshift and the physical conditions in the broad absorption line region" @default.
- W2054403809 doi "https://doi.org/10.1086/184497" @default.
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