Journal article
Active Galactic Nuclei in the Sloan Digital Sky Survey: I. Sample Selection
The Astronomical journal, v 129(4), pp 1783-1794
04 Jan 2005
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$\alpha$ Full
Width at Half Maxima values of emission line galaxies is strongly bimodal, with
two populations separated at about 1,200km s$^{-1}$. 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.
Metrics
Details
- Title
- Active Galactic Nuclei in the Sloan Digital Sky Survey: I. Sample Selection
- Creators
- Lei Hao - Princeton, CornellMichael A Strauss - PrincetonChristy A TremontiDavid J SchlegelTimothy M HeckmanGuinevere KauffmannMichael R BlantonXiaohui FanJames E GunnPatrick B HallŽeljko IvezićGillian R KnappJulian H KrolikRobert H LuptonGordon T RichardsDonald P SchneiderIskra V StratevaNadia L ZakamskaJ BrinkmannRobert J BrunnerGyula P Szokoly
- Publication Details
- The Astronomical journal, v 129(4), pp 1783-1794
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000227741700001
- Scopus ID
- 2-s2.0-19944407582
- Other Identifier
- 991014878288004721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics