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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 710688.0, MPI für Astronomie / Publikationen_mpia
More massive SMBHs reside in more massive dark matter halos
Authors:Krumpe, M.; Miyaji, T.; Coil, A.; Husemann, B.; Fanidakis, N.; Aceves, H.
Date of Publication (YYYY-MM-DD):2014-01
Audience:Not Specified
Abstract / Description:We are investigating the spatial clustering properties of AGN identified in the ROSAT All-Sky Survey (RASS) and Sloan Digital Sky Survey (SDSS). We previously found a positive X-ray luminosity dependence in the clustering of broad-line AGN at 0.16 < z < 0.36 (Krumpe et al. 2010), over the X-ray luminosity range of 43 < log L_{X} < 45. Here we investigate this trend by fitting H-alpha line profiles in the SDSS spectra for all X-ray and optically selected broad-line AGN, in order to determine the black hole mass and infer the accretion ratio relative to Eddington. Since M_BH and L/L_EDD are anti-correlated, we create AGN subsamples with a difference in one parameter while maintaining identical distributions in the other parameter. We find that the weak X-ray luminosity clustering dependence previously observed is caused by a difference in M_BH and not L/L_EDD. Consequently, on average, more massive dark matter halos harbor more massive active SMBH in our observed redshift and luminosity ranges. These results support the idea that high Eddington ratio does not necessarily require dense environments, and mergers can play only a minor role in the accretion processes in the low redshift Universe.
External Publication Status:published
Document Type:Other
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2014xru..confE.108K
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