The Low-Redshift Quasar-Quasar Correlation Function from an Extragalactic Halpha Emission-Line Survey to z = 0.4

We study the large-scale spatial distribution of low-redshift quasars and luminous Seyfert~1 galaxies using a sample of 108 AGN (0.2 1. We infer that quasars and luminous Seyfert~1 at $z \lesssim 0.3$ are useful tracers of the large-scale structure, with a bias comparable to groups of galaxies. We find a decrease in the quasar clustering amplitude by a factor of $4.6\pm1.9$ between z = 0.26 and $z \approx 1.5$