S20A0015abst
S20A0015
We will constrain the velocity shift (i.e., acceleration/deceleration) of narrow absorption lines (NALs) that are intrinsic to the quasars by observing 20 bright quasars that have been already observed at least once with 8–10m class telescopes. Although variation in line strength and/or profile are frequently reported (especially in broader absorption lines), only a few cases of velocity shifts have been reported to date. If NALs are not found to have velocity shifts it would invalidate some of the favored models for accretion disk winds. Taking radiative force into consideration, we can estimate the expected velocity shift, which depends on the absorber’s distance from the flux source and the fraction of the luminosity that accelerates the wind. Our pilot study of only six quasars in Misawa et al. (2019) found no intrinsic NALs with a velocity shift and placed 3σ upper limits of ∼0.7 km s−1 yr−1. In addition to collecting another multiply-observed 10 quasars from the Keck and VLT archives, we will request one more Subaru observation for 20 quasars with only one old spectrum. Based on our monitoring campaign for 36 (6 + 10 + 20) quasars in total, we will calculate the duty cycle for NAL acceleration, and determine whether quasar outflows are accelerating enough to contribute to AGN feedback.
This document was translated from LATEX by HEVEA.