Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: VLT/ISAAC Spectra of the H-beta Region in Intermediate-Redshift Quasars
  II. Black Hole Mass and Eddington Ratio   We derive black hole masses for a sample of about 300 AGNs in the redshift
range 0 < z < 2.5. We use the same virial velocity measure (FWHM Hbeta broad
component) for all sources which represents a significant improvement over
previous studies. We review methods and caveats for determining AGN black hole
masses via the virial assumption for motions in the gas producing low
ionization broad emission lines. We derive a corrected FWHM measure for the
broad component of H-beta that better estimates the virialized line emitting
component by comparing our FWHM measures with a sample of reverberated sources
with H-beta radial velocity dispersion measures. We also consider the FWHM of
the FeII 4570 blend as a potential alternative velocity estimator. We find a
range of black hole mass between log M ~ 6 - 10, where the black hole mass M is
in solar masses. Estimates using corrected FWHM, as well as FWHM(Fe II)
measures, reduce the number of sources with log M > 9.5 and suggest that
extremely large M values (log M >~ 10) may not be realistic. Derived Eddington
ratio values values show no evidence for a significant population of
super-Eddington radiators especially after correction is made for sources with
extreme orientation to our line of sight. Sources with FWHM(Hbeta broad
component) <~ 4000 km/s show systematically higher Eddington ratio and lower M
values than broader lined AGNs (including almost all radio-loud sources).

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The categories of this paper are: quant-ph
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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The categories of this paper are: math
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The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci
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The categories of this paper are: physics
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The categories of this paper are: mtrl-th