The variable component of the NGC 4151 IUE spectrum - Evidence for an expanding spherical emission shell

Details The variable component of the NGC 4151 IUE spectrum - Evidence for an expanding spherical emission shell The variable component of the NGC 4151 IUE spectrum - Evidence for an expanding spherical emission shell

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285...69s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 1, 1984, p. 69-73. Research supported by Bowling Green State Univ

Astronomy and Astrophysics

Astronomy

6

Astronomical Spectroscopy, Galactic Radiation, Seyfert Galaxies, Ultraviolet Astronomy, Astronomical Models, Emission Spectra, Galactic Nuclei, Iue, Spherical Shells

Scientific paper

The profile of the forbidden line of C III (1909) is the same in two pseudo-trailed, low-resolution SWP spectra of the nucleus of the Seyfert galaxy NGC 4151 obtained with the IUE in November 1980 and December 1982, respectively. In the 1980 spectrum, the C III forbidden line profile is also very nearly the same as that of the resonance line C IV (1550). In the 1982 spectrum, the continuum is 5 times higher and C IV is both much broader and much brighter. In the difference spectrum, which is interpreted to be the spectrum of a time-variable component, C IV (1550) is the only strong emission feature. The profile of this line closely resembles that of a spherical shell surrounding a less dense gas uniformly expanding from a central opaque object. From values of the profile parameters and from the observed time variability of the object, it is inferred that the shell has a radius of about 10 to the 15th cm, a mass of 0.25 solar mass, an expansion velocity of 13,000 km/s, and an electron density of 10 to the 11th per cu cm. From the line profile and the continuum, it is inferred that the opaque central source has approximate radius of 10 to the 14th cm and temperature 23,000 K.

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