HUT Observations of Time-Variable Absorption in NGC 4151

Details HUT Observations of Time-Variable Absorption in NGC 4151 HUT Observations of Time-Variable Absorption in NGC 4151

1997-05-23

arxiv.org/abs/astro-ph/9705193v1

Astronomy and Astrophysics

Astrophysics

to appear in Proceedings of the Carnegie Workshop on Mass Outflows from AGNs; prepared in LaTeX in PASP conference style

Scientific paper

We present the results of ultraviolet spectral monitoring of the Seyfert galaxy NGC 4151 performed by the Hopkins Ultraviolet Telescope during the Astro-2 mission. We show how the response of the Lyman continuum optical depth to variations in the continuum flux may be used to derive estimates of the distance of the absorbing gas from the central object. In this case, it seems that the absorbing gas is located $\leq 50$~pc away from the central source.

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