A comprehensive and uniform sample of broad-line active galactic nuclei
  from the SDSS DR7
  A new, complete sample of 14,584 broad-line AGNs at $z<0.35$ is presented,
which are uncovered homogeneously from the complete database of galaxies and
quasars observed spectroscopically in the Sloan Digital Sky Survey Seventh Data
Release. The stellar continuum is properly removed for each spectrum with
significant host absorption line features, and careful analyses of the
emission-line spectra, particularly in the H$\rm \alpha$ and H$\rm \beta$
wavebands, are carried out. The broad Balmer emission line, particularly, H$\rm
\alpha$, is used to indicate the presence of an AGN. The broad H$\rm \alpha$
lines have luminosities in a range of $10^{38.5}$-$10^{44.3}$ erg s$^{-1}$, and
line widths (FWHMs) of 500-34,000 km s$^{-1}$. The virial black hole masses,
estimated from the broad line measurements, span a range of
$10^{5.1}$-$10^{10.3}$ $M_\odot$, and the Eddington ratios vary from $-3.3$ to
$1.3$ in logarithmic scale. Other quantities such as multi-wavelength
photometric properties and flags denoting peculiar line profiles are also
included in this catalog. We describe the construction of this catalog and
briefly discuss its properties. The catalog is publicly available online. This
homogeneously selected AGN catalog, along with the accurately measured spectral
parameters, provide the most updated, largest AGN sample data, which will
enable further comprehensive investigations of the properties of the AGN
population in the low-redshift universe.
