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Paper: AGN Physics from QSO Clustering
Volume: 311, AGN Physics with the Sloan Digital Sky Survey
Page: 457
Authors: Croom, S.M.; Boyle, B.J.; Shanks, T.; Outram, P.; Smith, R.J.; Miller, L.; Loaring, N.; Kenyon, S.; Couch, W.
Abstract: We review the current status of QSO clustering measurements, particularly with respect to their relevance in understanding AGN physics. Measurements based on the 2dF QSO Redshift Survey (2QZ) find a scale length for QSO clustering of s0 = 5.76+0.17-0.27 h−1 Mpc at a redshift bar z ≈ 1.5, very similar to low-redshift galaxies. There is no evidence of evolution in the clustering of QSOs from z ~ 0.5 to z ~ 2.2. This lack of evolution and low clustering amplitude suggests a short life time for AGN activity of the order ~ 106 − 107 years. Large surveys such at the 2QZ and SDSS also allow the study of QSO environments in 3D for the first time (at least at low redshift). Early results from this work seem to show no difference between the environments of QSOs and normal galaxies. Future studies (e.g., measuring clustering as a function of black hole mass) and deep QSO surveys should provide further insight into the formation and evolution of AGN.
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