Active Galactic Nuclei in the Sloan Digital Sky Survey. I. Sample Selection | Zendy

Lei Hao | Zendy; Michael A. Strauss | Zendy; Christy Tremonti | Zendy; David J. Schlegel | Zendy; Timothy M. Heckman | Zendy; Guinevere Kauffmann | Zendy; Michael R. Blanton | Zendy; Xiaohui Fan | Zendy; James E. Gunn | Zendy; Patrick B. Hall | Zendy; Željko Ivezić | Zendy; G. R. Knapp | Zendy; Julian H. Krolik | Zendy; Robert H. Lupton | Zendy; Gordon T. Richards | Zendy; Donald P. Schneider | Zendy; Iskra Strateva | Zendy; Nadia L. Zakamska | Zendy; J. Brinkmann | Zendy; Róbert Brunner | Zendy; G. Szokoly | Zendy

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Active Galactic Nuclei in the Sloan Digital Sky Survey. I. Sample Selection

Author(s) -

Lei Hao,

Michael A. Strauss,

Christy Tremonti,

David J. Schlegel,

Timothy M. Heckman,

Guinevere Kauffmann,

Michael R. Blanton,

Xiaohui Fan,

James E. Gunn,

Patrick B. Hall,

Željko Ivezić,

G. R. Knapp,

Julian H. Krolik,

Robert H. Lupton,

Gordon T. Richards,

Donald P. Schneider,

Iskra Strateva,

Nadia L. Zakamska,

J. Brinkmann,

Róbert Brunner,

G. Szokoly

Publication year - 2005

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/428485

Subject(s) - active galactic nucleus , astrophysics , physics , galaxy , emission spectrum , redshift , sky , astronomy , line (geometry) , quasar , luminosity function , spectral line , luminosity , equivalent width , geometry , mathematics

We have compiled a large sample of low-redshift active galactic nuclei (AGN)identified via their emission line characteristics from the spectroscopic dataof the Sloan Digital Sky Survey. Since emission lines are often contaminated bystellar absorption lines, we developed an objective and efficient method ofsubtracting the stellar continuum from every galaxy spectrum before makingemission line measurements. The distribution of the measured H$\alpha$ FullWidth at Half Maxima values of emission line galaxies is strongly bimodal, withtwo populations separated at about 1,200km s$^{-1}$. This feature provides anatural separation between narrow-line and broad-line AGN. The narrow-line AGNare identified using standard emission line ratio diagnostic diagrams. 1,317broad-line and 3,074 narrow-line AGN are identified from about 100,000 galaxyspectra selected over 1151 square degrees. This sample is used in a companionpaper to determine the emission-line luminosity function of AGN.

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