This is the fifth paper in a series of investigations of the clustering properties of luminous, broad-emission-line active galactic nuclei (AGNs) 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 Data Release 14 AGNs 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-selected and optically selected AGNs at 0.44 < z < 0.64 reside in statistically identical halos with a typical dark matter halo (DMH) mass of $$M$$$^{typ,AGN}_{DMH}$$ ~ 1012.7 h–1 M⊙. The acceptable HOD parameter space for these two broad-line AGN samples have only statistically marginal differences caused by small deviations of the CCFs in the one-halo-dominated regime on small scales. In contrast to optically selected AGNs, the X-ray AGN sample may contain a larger population of satellites at MDMH ~ 1013h–1M⊙. We compare our measurements in this work with our earlier studies at lower independent redshift ranges, spanning a lookback time of 6 Gyr. The comparison over this wider redshift range of 0.07 < z < 0.64 reveals (i) no significant difference between the typical DMH masses of X-ray-selected and optically selected AGNs, (ii) weak positive clustering dependencies of $$M$$$^{typ,AGN}_{DMH}$$ with LX and MBH, (iii) no significant dependence of $$M$$$^{typ,AGN}_{DMH}$$ on Eddington ratio, and (iv) the same DMH masses host more-massive accreting black holes at high redshift than at low redshifts.
Krumpe, Mirko, et al. "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." The Astrophysical Journal, vol. 952, no. 2, Jul. 2023. https://doi.org/10.3847/1538-4357/acc8d3
Krumpe, Mirko, Miyaji, Takamitsu, Georgakakis, Antonis, Schulze, Andreas, Coil, Alison L., Dwelly, Tom, Coffey, Damien, Comparat, Johan, Aceves, Héctor, Salvato, Mara, Merloni, Andrea, Maraston, Claudia, Nandra, Kirpal, Brownstein, Joel R., & Schneider, Donald P. (2023). 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. The Astrophysical Journal, 952(2). https://doi.org/10.3847/1538-4357/acc8d3
Krumpe, Mirko, Miyaji, Takamitsu, Georgakakis, Antonis, et al., "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," The Astrophysical Journal 952, no. 2 (2023), https://doi.org/10.3847/1538-4357/acc8d3
@article{osti_2425365,
author = {Krumpe, Mirko and Miyaji, Takamitsu and Georgakakis, Antonis and Schulze, Andreas and Coil, Alison L. and Dwelly, Tom and Coffey, Damien and Comparat, Johan and Aceves, Héctor and Salvato, Mara and others},
title = {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},
annote = {This is the fifth paper in a series of investigations of the clustering properties of luminous, broad-emission-line active galactic nuclei (AGNs) 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 Data Release 14 AGNs with the SDSS CMASS galaxy sample at 0.44 12.7 h–1 M⊙. 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 AGNs, the X-ray AGN sample may contain a larger population of satellites at MDMH ~ 1013h–1M⊙. We compare our measurements in this work with our earlier studies at lower independent redshift ranges, spanning a lookback time of 6 Gyr. The comparison over this wider redshift range of 0.07 X and MBH, (iii) no significant dependence of $M$$^{typ,AGN}_{DMH}$ on Eddington ratio, and (iv) the same DMH masses host more-massive accreting black holes at high redshift than at low redshifts.},
doi = {10.3847/1538-4357/acc8d3},
url = {https://www.osti.gov/biblio/2425365},
journal = {The Astrophysical Journal},
issn = {ISSN 0004-637X},
number = {2},
volume = {952},
place = {United States},
publisher = {IOP Publishing},
year = {2023},
month = {07}}