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Title:
Observational determination of the masses of active galactic nuclei
Authors:
Wandel, A.; Mushotzky, R. F.
Affiliation:
AA(Maryland, University, College Park), AB(NASA, Goddard Space Flight Center, Greenbelt, MD)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 306, July 15, 1986, p. L61-L65. (ApJL Homepage)
Publication Date:
07/1986
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Active Galactic Nuclei, Quasars, Stellar Mass, X Ray Sources, Astronomical Catalogs, Emission Spectra, Line Spectra, Oxygen Spectra
DOI:
10.1086/184706
Bibliographic Code:
1986ApJ...306L..61W

Abstract

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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