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Far Ultraviolet Spectroscopic Explorer Spectroscopy of Absorption and Emission Lines from the Narrow-line Seyfert 1 Galaxy Ngc 4051

We present three Far Ultraviolet Spectroscopic Explorer (FUSE) observations of the Narrow-Line Seyfert 1 galaxy NGC 4051. The most prominent features in the far-ultraviolet (FUV) spectrum are the O VI emission and absorption lines and the H I Lyman series absorption lines which are detected up to the Lyman edge. We also identify weak emission from N III, C III, and He II. The C III line shows absorption while none is detected in the N III and He II lines. In H I and C III we detect two main absorption systems at outflow velocities of −50 ± 30 and −240 ± 40 km s −1 , as well as a possible third one at ∼ −450 km s −1. These systems are consistent in velocity with the 10 absorption systems found previously in C IV, N V, and Si IV, though the individual systems are blended together in the FUV spectrum. We estimate column densities of the two main absorption systems and find that the H I column density is lower for systems with larger outflow velocity. We detect no flux or spectral variations of NGC 4051 at FUV wavelengths during three epochs spanning one year. This is consistent with the optical light curve which shows no variations between the three epochs. It is also consistent with the X-ray light curve which shows consistent flux levels at the three epochs of the FUSE observations, although the X-ray light curve shows strong variations on much shorter timescales.