The core of the narrow line region of NGC 4151

Details The core of the narrow line region of NGC 4151 The core of the narrow line region of NGC 4151

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...178....7s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 178, no. 1-2, May 1987, p. 7-15.

Astronomy and Astrophysics

Astrophysics

24

Galactic Nuclei, Seyfert Galaxies, Spectral Line Width, H Lines, Ionization, Iron, Optical Thickness, Oxygen, Velocity Distribution

Scientific paper

Coudé spectra from the innermost 2arcsec of NGC 4151 are presented. Line profiles of a range of ions from O0 to Fe6+ are compared. With the possible exception of [Fe VII] λ6087, all lines appear to be moderately but significantly blueshifted relative to the well defined systemic velocity of (1000±3) km s-1. The profiles show no gross asymmetries and have usually a narrower core and a wider wing than a gaussian of same half-maximum width. The line width increases with rising ionization potential; a correlation with critical density may be spurious. The interplay of line width variation and profile shape is emphasized from which strong evidence for a system of optically thick clouds and the fallacy of occasionally used simple models are inferred. Evidencve for internal rather than external obscuration calls for a velocity field significantly influenced by gravitation. A more detailed, but tentative scenario is proposed.

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