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Modelling the Evolution of Outflow Troughs in NGC3783

Abstract

Using archival spectra from the Cosmic Origins Spectrograph (COS) and Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope over a time span of 16 years, we explore the variability of absorption troughs in lines of C IV from outflowing material of NGC3783. Using templates of earlier epoch troughs, we visually determine trough structure changes. We observe changes in the optical depths and/or covering factors, which is indicative of bulk motion of material across the line-of-sight. Furthermore, we use troughs of doublets to model blended troughs. We find that the blended troughs cannot be modelled fully by the corresponding doublet troughs, which implies that there must be additional absorbing material.

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