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

Abstract

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.

14 pages including 1 table, 4 figures. To appear in AJ

References in corpus (3)

• STIS Echelle Observations of the Seyfert Galaxy NGC 4151: Physical Conditions in the Ultraviolet Absorbers
• Characterising the complex absorber in NGC 4151
• Evidence for an accelerating wind as the broad-line region in NGC 3516

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