Active Galactic Nuclei in the Sloan Digital Sky Survey: I. Sample Selection
Abstract
We have compiled a large sample of low-redshift active galactic nuclei (AGN) identified via their emission line characteristics from the spectroscopic data of the Sloan Digital Sky Survey. Since emission lines are often contaminated by stellar absorption lines, we developed an objective and efficient method of subtracting the stellar continuum from every galaxy spectrum before making emission line measurements. The distribution of the measured H Full Width at Half Maxima values of emission line galaxies is strongly bimodal, with two populations separated at about 1,200km s. This feature provides a natural separation between narrow-line and broad-line AGN. The narrow-line AGN are identified using standard emission line ratio diagnostic diagrams. 1,317 broad-line and 3,074 narrow-line AGN are identified from about 100,000 galaxy spectra selected over 1151 square degrees. This sample is used in a companion paper to determine the emission-line luminosity function of AGN.
Cite
@article{arxiv.astro-ph/0501059,
title = {Active Galactic Nuclei in the Sloan Digital Sky Survey: I. Sample Selection},
author = {Lei Hao and Michael A. Strauss and Christy A. Tremonti and David J. Schlegel and Timothy M. Heckman and Guinevere Kauffmann and Michael R. Blanton and Xiaohui Fan and James E. Gunn and Patrick B. Hall and Željko Ivezić and Gillian R. Knapp and Julian H. Krolik and Robert H. Lupton and Gordon T. Richards and Donald P. Schneider and Iskra V. Strateva and Nadia L. Zakamska and J. Brinkmann and Robert J. Brunner and Gyula P. Szokoly},
journal= {arXiv preprint arXiv:astro-ph/0501059},
year = {2016}
}
Comments
High-res version at http://isc.astro.cornell.edu/~haol/agn/paper1.pdf . 29 pages; To appear in AJ (April 2005). See astro-ph/0501042 for Paper II