Recovery of broad emission lines of NGC 4151

Details Recovery of broad emission lines of NGC 4151 Recovery of broad emission lines of NGC 4151

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasj...43l...1a&link_type=abstract

Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 43, no. 1, 1991, p. L1-L7.

Astronomy and Astrophysics

Astronomy

18

Active Galactic Nuclei, Emission Spectra, Seyfert Galaxies, H Alpha Line, H Beta Line, Ultraviolet Spectra, X Ray Spectra

Scientific paper

Intense broad components of the H-alpha and H-beta emission lines of a Seyfert galaxy, NGC 4151, observed on July 27 and 28, 1990 were found. Their intensities were stronger by a factor of about 2 to 5 than the faint states observed previously. This result is consistent with observations in both the X-ray and ultraviolet wavelength regions, indicating that the nuclear activity of NGC 4151 has possibly recovered its high state (i.e., this galaxy has returned to a type-1 Seyfert from a type-2).

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