A comprehensive and uniform sample of broad-line active galactic nuclei from the SDSS DR7

Abstract

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$\alpha$ and H$\beta$ wavebands, are carried out. The broad Balmer emission line, particularly, H$\alpha$, is used to indicate the presence of an AGN. The broad H$\alpha$ 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.

arXiv comment22 pages, 11 figures, 3 tables; accepted for publication in ApJS

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