Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21532306y&link_type=abstract
American Astronomical Society, AAS Meeting #215, #323.06; Bulletin of the American Astronomical Society, Vol. 42, p.419
Astronomy and Astrophysics
Astronomy
Scientific paper
To understand the co-evolution of AGN and their host galaxies requires accurate classification between AGN and star-forming galaxies, and disentangling them when they both exist. Both AGN and star formation are more active at higher redshift, but their classification becomes difficult when Halpha and [N II] emission lines shift out of the optical window (z>0.4), especially for low-luminosity AGN (LLAGN). We propose a new AGN/SF classification diagram combining [O III]/Hbeta and optical U-B color, which can be applied at high redshift and effectively recovers the results from the traditional line ratio diagnostics. We combine deep Chandra X-ray data with high-quality optical spectra from the DEEP2 survey to classify sources into several classes: AGN, SF, AGN/SF composites, X-ray bright, optically normal galaxies (XBONGs). We investigate the nature of these different classes and evaluate the incompleteness associated with optical and X-ray AGN samples.
AEGIS Collaboration
Ho Lee
Yan Renbin
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