NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-22 T13:55:26 PDT
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For refcode 1990ApJ...353..438P:
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Copyright by American Astronomical Society. Reproduced by permission
1990ApJ...353..438P THE MASS FUNCTION OF SEYFERT 1 NUCLEI P. PADOVANI AND R. BURG Space Telescope Science Institute AND R. A. EDELSON Center for Astronomy and Space Astrophysics, University of Colorado Received 1989 August 18; accepted 1989 October 18 ABSTRACT The first mass function of Seyfert l nuclei is derived from optical spectra of the complete CfA sample of Seyfert galaxies by estimating the mass for each object from the dynamical relation M ~ v^2^r/2G. An independent estimate is also derived using a complete infrared-selected sample. The two mass functions are indistinguishable, and the differential mass function is well described by {phi}(M) is proportional to M^-2^ for M >~ 5 x 10^6^ M_sun_. The mean mass of Seyfert 1 nuclei is ~ 2 x 10^7^ M_sun_, and the integrated mass density is ~ 6 x 10^11^ M_sun_ Gpc^-3^. This is approximately two orders of magnitude less than the value inferred from the energetics associated with quasar counts. A careful analysis of the various parameters and assumptions involved suggests that this large difference is not due to systematic errors in our determinations. Therefore, the bulk of the mass related to the accretion processes connected with past quasar activity does not reside in Seyfert 1 nuclei. Instead, the remnants of past activity must be present in a much larger number of galaxies, and a one-to-one relation between distant and local active galactic nuclei seems then to be excluded. Subject headings: galaxies: nuclei - galaxies: Seyfert - quasars
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