Is there a precession-type movement in the nucleus of NGC 4151?

Details Is there a precession-type movement in the nucleus of NGC 4151? Is there a precession-type movement in the nucleus of NGC 4151?

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.205..171n&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 205, no. 1, p. 171-177.

Astronomy and Astrophysics

Astrophysics

1

Active Galactic Nuclei, Emission Spectra, Ionizing Radiation, Helium, Line Shape, Visible Spectrum

Scientific paper

Optical spectra of the NGC 4151 with the TV scanner of the 6-m telescope during 1986-1991 are presented. Spectra averaged over periods of about 2.5 months show changes of asymmetry of the He II 4686 A broad emission line with a characteristic time scale of about 2 yr (the full cycle of the changes is approximately 4 yr). Possible explanations involving a precession-type movement of cones of ionizing radiation are discussed.

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