HUT Observations of Time-Variable Absorption in NGC 4151
Astrophysics
2007-05-23 v1
Abstract
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 ~pc away from the central source.
Keywords
Cite
@article{arxiv.astro-ph/9705193,
title = {HUT Observations of Time-Variable Absorption in NGC 4151},
author = {J. H. Krolik and G. A. Kriss},
journal= {arXiv preprint arXiv:astro-ph/9705193},
year = {2007}
}
Comments
to appear in Proceedings of the Carnegie Workshop on Mass Outflows from AGNs; prepared in LaTeX in PASP conference style