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Balmer and He I absorption in the nuclear spectrum of NGC 4151

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arxiv astro-ph/0208262 v1 pith:3ET5JXZ3 submitted 2002-08-13 astro-ph

Balmer and He I absorption in the nuclear spectrum of NGC 4151

J.B. Hutchings (HIA/NRC) , D.M. Crenshaw (Georgia State Univ) , S.B. Kraemer , J.R. Gabel (Catholic Univ of America) , M.E. Kaiser (Johns Hopkins Univ) , D. Weistrop (Univ of Nevada , Las Vegas) , T.R Gull (Goddard Space Flight Center) This is my paper
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keywords nuclearabsorptionbalmerseenspectraspectrumstatesabsorbers
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Spectra taken with the Space Telescope Imaging Spectrograph (STIS) allow accurate location and extraction of the nuclear spectrum of NGC 4151, with minimal contamination by extended line emission and circumnuclear starlight. Spectra since 1997 show that the P Cygni Balmer and He I absorption seen previously in low nuclear states, is present in higher states, with outflow velocity that changes with the nuclear flux. The phenomenon is discussed in terms of some of the absorbers seen in the UV resonance lines, and outflows from the central source and surrounding torus.

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