Long-term X-ray stability and UV variability of the ionized absorption in NGC 3783

Abstract

We present the results of recent Chandra High-Energy Transmission Grating Spectrometer and Hubble Space Telescope Cosmic Origins Spectrograph observations of the nearby Seyfert 1 galaxy NGC 3783 which shows a strong, non-varying X-ray warm absorber and physically related and kinematically varying UV absorption. We compare our new observations to high-resolution, high signal-to-noise archival data from 2001, allowing a unique investigation into the long-term variations of the absorption over a 12 yr period. We find no statistically significant changes in the physical properties of the X-ray absorber, but there is a significant drop of ~40% in the UV and X-ray flux, and a significant flattening of the underlying X-ray power-law slope. Large kinematic changes are seen in the UV absorbers, possibly due to radial deceleration of the material. Similar behavior is not observed in the X-ray data, likely due to its lower velocity resolution, which shows an outflow velocity of v ~ -655 km/s in both epochs. The narrow iron K-alpha emission line at 6.4 keV shows no variation between epochs, and its measured width places the material producing the line at a radial distance of ~0.03 pc from the central black hole.

arXiv comment20 pages, 10 figures, 5 tables. Accepted for publication in ApJ

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• Magnetized Disk-Winds in NGC 3783
• HST/COS observations of the newly discovered obscuring outflow in NGC 3783
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• HST/COS Observations of Quasar Outflows in the 500 -- 1050 Å Rest Frame: IV. The Largest Broad Absorption Line Acceleration
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• A Kinematic Shift of the C IV Broad Absorption Line in Quasar SDSS J120819.29+035559.4
• Time-dependent photoionization spectroscopy of the Seyfert galaxy NGC 3783
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• Ionization Distributions in Outflows of Active Galaxies: Universal Trends and Prospect of Future XRISM Observations