The warm absorber in NGC 5548: The lean years

Abstract

We study the variability of the warm absorber and the gas responsible for the emission lines in the Seyfert 1 galaxy NGC 5548, in order to constrain the location and physical properties of these components. Using X-ray spectra taken with the \textit{Chandra}$-$LETGS in 2002 and 2005, we study variability in the ionic column densities and line intensities. We find a lower \ion{O}{vii} forbidden emission line flux in 2005, while the Fe K$\alpha$ line flux stays constant. The warm absorber is less ionized in 2005, allowing us to constrain its location to within 7 pc of the central source. Using both the observed variability and the limit on the FWHM of the \ion{O}{vii} f line, we have constrained the location of the narrow line region to a distance of 1 pc from the central source. The apparent lack of variability of the Fe K$\alpha$ line flux does not allow for a unique explanation.

6 pages, 6 figures, accepted by A&A

References in corpus (21)

• Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database
• A light bending model for the X-ray temporal and spectral properties of accreting black holes
• Reverberation Measurements of the Inner Radius of the Dust Torus in Nearby Seyfert 1 Galaxies
• Elemental Abundances in QSOs: Star Formation and Galactic Nuclear Evolution at High Redshifts
• The nature and origin of Seyfert warm absorbers
• Combined Long and Short Timescale X-ray Variability of NGC4051 with RXTE and XMM-Newton
• Intrinsic Absorption Lines in Seyfert 1 Galaxies. I. Ultraviolet Spectra from the Hubble Space Telescope
• Observable Properties of X-ray Heated Winds in AGN: Warm Reflectors and Warm Absorbers
• First Light Measurements of Capella with the Low Energy Transmission Grating Spectrometer aboard the Chandra X-ray Observatory
• Simultaneous X-ray and UV spectroscopy of the Seyfert 1 galaxy NGC 5548.II. Physical conditions in the X-ray absorber
• Physical Diagnostics from a Narrow Fe-Kalpha Emission Line Detected by Chandra in the Seyfert 1 Galaxy NGC 5548
• X-ray spectroscopy of NGC 5548
• XMM-NEWTON High Resolution Spectroscopy of NGC 5548
• NGC 5548 in a Low-Luminosity State: Implications for the Broad-Line Region
• X-Ray/Ultraviolet Observing Campaign of the Markarian 279 Active Galactic Nucleus Outflow: a close look at the absorbing/emitting gas with Chandra-LETGS
• Dynamics of Warm-Absorbing Gas in Seyfert Galaxies: NGC 5548
• Intrinsic Absorption Lines in the Seyfert 1 Galaxy NGC 5548: UV Echelle Spectra from the Space Telescope Imaging Spectrograph
• Evidence for a Physically Compact Narrow-Line Region in the Seyfert 1 Galaxy NGC 5548
• A simultaneous XMM-Newton and BeppoSAX observation of the archetypal Broad Line Seyfert 1 galaxy NGC 5548
• Simultaneous UV and X-ray Spectroscopy of the Seyfert 1 Galaxy NGC 5548. I. Physical Conditions in the UV Absorbers
• Suzaku Observations of Iron Lines and Reflection in AGN

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