FUSE Observations of NGC 5548 in a Low State

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We present far-ultraviolet spectra of the Seyfert 1 galaxy NGC 5548 obtained in 2000 June with the Far Ultraviolet Spectroscopic Explorer (FUSE).Our data span the observed wavelength range 915--1185 Å, with a resolution of ~ 20 km s-1. The spectrum shows a blue continuum and emission from O VI, C III, and He II. The low state has left O VI showing strong narrow components in emission. We also resolve intrinsic, associated absorption lines of O VI and the Lyman series. Several distinct kinematic components are present, spanning a velocity range of -50 to -1200 km s-1 relative to systemic. We explore the relationships between the O VI absorbers and those seen previously in the ultraviolet and X-rays.

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