An accretion event in the Seyfert galaxy NGC 5548

Details An accretion event in the Seyfert galaxy NGC 5548 An accretion event in the Seyfert galaxy NGC 5548

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.324..345p&link_type=abstract

Nature (ISSN 0028-0836), vol. 324, Nov. 27, 1986, p. 345-347.

Astronomy and Astrophysics

Astronomy

50

Accretion Disks, Black Holes (Astronomy), Galactic Evolution, Galactic Nuclei, Seyfert Galaxies, Helium, Luminosity, Schwarzschild Metric, Spectrum Analysis, X Ray Spectra

Scientific paper

The authors draw attention to a remarkable change which occurred in the spectrum of the low-luminosity, optically variable, Seyfert galaxy NGC 5548. An increase in optical luminosity was accompanied by the appearance of a strong, abnormally broad He II 4,686-Å emission line. The appearance of this line indicates the presence of a component of highly ionized gas that did not contribute to the optical spectrum before the increase in luminosity. The greater line width suggests that the gas producing the He II emission is much closer to the central object than the broad region. This observation may be the first direct evidence of the accretion onto a central object.

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