Physics and Astronomy Publications
Document Type
Article
Publication Date
9-1-2022
Journal
Astrophysical Journal
Volume
936
Issue
2
URL with Digital Object Identifier
10.3847/1538-4357/ac854c
Abstract
We present continued analysis of a sample of low-redshift iron low-ionization broad-absorption-line quasars (FeLoBALQs). Choi et al. presented SimBAL spectral analysis of broad-absorption-line (BAL) outflows in 50 objects. Leighly et al. analyzed the optical emission lines of 30 of those 50 objects and found that they are characterized by either a high accretion rate (L Bol/L Edd > 0.3) or low accretion rate (0.03 < L Bol/L Edd < 0.3). We report that the outflow velocity is inversely correlated with the BAL location among the high-accretion-rate objects, with the highest velocities observed in parsec-scale outflows. In contrast, the low-Eddington-ratio objects showed the opposite trend. We confirmed the known relationship between the outflow velocity and L Bol/L Edd and found that the scatter plausibly originates in the force multiplier (launch radius) in the low(high)-accretion-rate objects. A log volume filling factor between −6 and −4 was found in most outflows but was as high as −1 for low-velocity compact outflows. We investigated the relationship between the observed [O iii] emission and that predicted from the BAL gas. We found that these could be reconciled if the emission-line covering fraction depends on the Seyfert type and BAL location. The difference between the predicted and observed [O iii] luminosity is correlated with the outflow velocity, suggesting that [O iii] emission in high-Eddington-ratio objects may be broad and hidden under Fe ii emission. We suggest that the physical differences in the outflow properties as a function of location in the quasar and accretion rate point to different formation, acceleration, and confinement mechanisms for the two FeLoBALQ types.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Citation of this paper:
Choi, Hyunseop, Karen M. Leighly, Collin Dabbieri, Donald M. Terndrup, Sarah C. Gallagher, and Gordon T. Richards. 2022. “The Physical Properties of Low-Redshift FeLoBAL Quasars. III. The Location and Geometry of the Outflows.” The Astrophysical Journal 936 (2): 110. https://doi.org/10.3847/1538-4357/ac854c.
