A detailed study of the C IV 1550-A line profile and adjacent spectral features in NGC 4151 from 1978 to 1983

Details A detailed study of the C IV 1550-A line profile and adjacent spectral features in NGC 4151 from 1978 to 1983 A detailed study of the C IV 1550-A line profile and adjacent spectral features in NGC 4151 from 1978 to 1983

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...321..251c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 321, Oct. 1, 1987, p. 251-279.

Astronomy and Astrophysics

Astrophysics

99

Carbon, Line Shape, Seyfert Galaxies, Spectrum Analysis, Ultraviolet Spectra, Absorption Spectra, Accretion Disks, Emission Spectra, Galactic Nuclei, Gas Density, Gas Dynamics

Scientific paper

The 1450 - 1720 Å spectral region of NGC 4151 is analyzed by means of Gaussian decomposition for 69 different epochs, from early 1978 to the end of 1983. The C IV λ1550 emission profile is well represented by a core, whose full width at half-maximum varies between 2600 and 5500 km s-1, and an ultrabroad component (14,600 km s-1). The variations of the ultrabroad feature suggest that it originates in a region whose "radius" is ≡5 lt-day. The analysis of lines from He II, C III], N IV] and O III] indicates the presence of two additional discrete broad line subregions. A study of the velocity dispersions indicates that the motion of the gas is Keplerian and yields a value of (3.7±0.5)×107M_sun; for the central mass. A correlation is found between the wavelength of the ultrabroad C IV λ1550 component and its intensity. It strongly suggests the existence of a decelerated outflow whose velocity is 4000 km s-1 at 5 lt-day from the nucleus.

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