Comparison of disk and broad line region sizes in the AGN NGC 4593
Abstract
The active galactic nucleus, NGC 4593, was monitored daily with the Hubble Space Telescope during a ~month long period in July - August 2016. During each observation spectra from the UV through near-IR were obtained. Combining with high-cadence Swift photometric monitoring we measure significant reverberation lags for eight broad emission lines. The lags broadly scale with line width, as expected for virialized motion and give a black hole mass estimate consistent with previous values. Generally, the lags for the most highly ionized lines are shorter than the continuum reverberation lags measured from the same campaign. If the continuum reverberation lags are dominated by reprocessing in the accretion disk, this implies the broad line region is well within the extent of the optical-emitting accretion disk.
- Publication:
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AAS/High Energy Astrophysics Division
- Pub Date:
- March 2019
- Bibcode:
- 2019HEAD...1710633C