GHRS Monitoring of the Outflowing Material in NGC 4151

Abstract

We present the results of a GHRS program to monitor the absorption lines in the spectrum of the Seyfert 1 galaxy NGC 4151 caused by outflowing gas from the nucleus. Although we see subtle changes over the four year period in the GHRS spectra of the broader of the absorption features, the wavelength constancy of all the features is remarkable. The limits on the secular acceleration suggest that either (1) The absorbing clouds are well beyond the broad emission line region, or (2) The clouds are experiencing significant drag from an intercloud medium. The exception to this constancy occurred during one of the epochs of our monitoring when a broad shallow C IV trough appeared at an outflow velocity of 3750 km/s and then subsequently disappeared.

4 pages, 3 postscript figures, to appear in the GHRS Science Symposium Proceedings

References in corpus (1)

• Multiwavelength observations of short time-scale variability in NGC 4151. I. Ultraviolet observations

Cited by in corpus (41)

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• Variable UV Absorption in the Spectrum of MRC 2251-178
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• Probing the BLR in AGNs using time variability of associated absorption line
• Subaru High-Dispersion Spectroscopy of Narrow-Line Region in the Seyfert Galaxy NGC 4151
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