THE SPATIAL CLUSTERING OF<i>ROSAT</i>ALL-SKY SURVEY ACTIVE GALACTIC NUCLEI. III. EXPANDED SAMPLE AND COMPARISON WITH OPTICAL ACTIVE GALACTIC NUCLEI

Abstract

This is the third paper in a series that reports on our investigation of the\nclustering properties of AGNs identified in the ROSAT All-Sky Survey (RASS) and\nSloan Digital Sky Survey (SDSS). In this paper, we extend the redshift range to\n0.07&lt;z&lt;0.50 and measure the clustering amplitudes of both X-ray and\noptically-selected SDSS broad-line AGNs with and without radio detections as\nwell as for X-ray selected narrow-line RASS/SDSS AGNs. We measure the\nclustering amplitude through cross-correlation functions (CCFs) with SDSS\ngalaxies and derive the bias by applying a halo occupation distribution (HOD)\nmodel directly to the CCFs. We find no statistically convincing difference in\nthe clustering of X-ray and optically-selected broad-line AGNs, as well as with\nsamples in which radio-detected AGNs are excluded. This is in contrast to low\nredshift optically-selected narrow-line AGNs, where radio-loud AGNs are found\nin more massive halos than optical AGNs without a radio-detection. The typical\ndark matter halo masses of our broad-line AGNs are log M_DMH/[h^(-1) M_SUN] ~\n12.4-13.4, consistent with the halo mass range of typical non-AGN galaxies at\nlow redshifts. We find no significant difference between the clustering of\nX-ray selected narrow-line AGNs and broad-line AGNs. We confirm the weak\ndependence of the clustering strength on AGN X-ray luminosity at a ~2 sigma\nlevel. Finally, we summarize the current picture of AGN clustering to z~1.5\nbased on three dimensional clustering measurements.\n