The spatial clustering of ROSAT all-sky survey Active Galactic Nuclei: V. The evolution of broad-line AGN clustering properties in the last 6 Gyr

Abstract

This is the fifth paper in a series of investigations of the clustering properties of luminous, broad-emission-line active galactic nuclei (AGN) identified in the ROSAT All-Sky Survey (RASS) and Sloan Digital Sky Survey (SDSS). In this work we measure the cross-correlation function (CCF) between RASS/SDSS DR14 AGN with the SDSS CMASS galaxy sample at $0.44<z<0.64$. We apply halo occupation distribution (HOD) modeling to the CCF along with the autocorrelation function of the CMASS galaxies. We find that X-ray and optically selected AGN at $0.44<z<0.64$ reside in statistically identical halos with a typical dark matter halo mass of $M_{\mathrm{DMH}}^{\mathrm{typ},\mathrm{AGN}}\sim 10^{12.7}{h}^{-1}{\mathrm{M}}_{\odot }$. The acceptable HOD parameter space for these two broad-line AGN samples have only statistically marginal differences caused by small deviations of the CCFs in the one-halo-dominated regime on small scales. In contrast to optically selected AGN, the X-ray AGN sample may contain a larger population of satellites at $M_{\mathrm{DMH}}\sim 10^{13}{h}^{-1}{\mathrm{M}}_{\odot }$. We compare our measurements in this work with our earlier studies at lower independent redshift ranges, spanning a look-back time of 6 Gyr. The comparison over this wider redshift range of $0.07<z<0.64$ reveals: (i) no significant difference between the typical DMH masses of X-ray and optically selected AGN, (ii) weak positive clustering dependencies of $M_{\mathrm{DMH}}^{\mathrm{typ},\mathrm{AGN}}$ with $L_{\mathrm{X}}$ and $M_{\mathrm{BH}}$, (iii) no significant dependence of $M_{\mathrm{DMH}}^{\mathrm{typ},\mathrm{AGN}}$ on Eddington ratio, and (iv) the same DMH masses host more-massive accreting black holes at high redshift than at low redshifts.

arXiv comment23 pages, 16 figures, 3 tables, accepted for publication in ApJ

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