Observational determination of the masses of active galactic nuclei

Details Observational determination of the masses of active galactic nuclei Observational determination of the masses of active galactic nuclei

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...306l..61w&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 306, July 15, 1986, p. L61-L65.

Astronomy and Astrophysics

Astrophysics

112

Active Galactic Nuclei, Quasars, Stellar Mass, X Ray Sources, Astronomical Catalogs, Emission Spectra, Line Spectra, Oxygen Spectra

Scientific paper

The masses of 24 active galactic nuclei are determined on the basis of published observations, using data on both the X-ray variability and the width of the narrow forbidden lines of O III. The results are presented in tables and graphs, and it is found that the mass estimates based on the X-ray variability are in good agreement with the dynamic masses determined from the O III linewidth when reasonable values are selected for the radius of the region of X-ray origin and when a standard photoionization model is adopted for the line-emitting gas. The O III dynamic masses of Seyfert-2 nuclei are shown to be systematically lower than those predicted by the (delta t)/M(O III) correlation for Seyfert-1 nuclei.

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