SIMBAD references

2011ApJ...741...15S - Astrophys. J., 741, 15 (2011/November-1)

Constraining halo occupation properties of X-ray active galactic nuclei using clustering of Chandra sources in the Bootes survey region.

STARIKOVA S., COOL R., EISENSTEIN D., FORMAN W., JONES C., HICKOX R., KENTER A., KOCHANEK C., KRAVTSOV A., MURRAY S.S. and VIKHLININ A.

Abstract (from CDS):

We present one of the most precise measurements to date of the spatial clustering of X-ray-selected active galactic nuclei (AGNs) using a sample derived from the Chandra X-ray Observatory survey in the Boötes field. The real-space two-point correlation function over a redshift interval from z = 0.17 to z ∼ 3 is well described by the power law, ξ(r) = (r/r0)–γ, for comoving separations r ≲ 20 h–1 Mpc. We find γ = 1.84±0.12 and r0 consistent with no redshift trend within the sample (varying between r0= 5.5±0.6 h–1 Mpc for = 0.37 and r0= 6.9±1.0 h –1 Mpc for = 1.28). Furthermore, we are able to measure the projections of the two-point correlation function both on the sky plane and in the line of sight. We use these measurements to show that the Chandra/Boötes AGNs are predominantly located at the centers of dark matter halos with circular velocity vmax> 320 km/s or M180> 4.1x1012 h–1 M{x2609}, and tend to avoid satellite galaxies in halos of this or higher mass. The halo occupation properties inferred from the clustering properties of Chandra/Boötes AGNs–the mass scale of the parent dark matter halos, the lack of significant redshift evolution of the clustering length, and the low satellite fraction–are broadly consistent with the Hopkins et al. scenario of quasar activity triggered by mergers of similarly sized galaxies.

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Journal keyword(s): galaxies: active - galaxies: statistics - large-scale structure of universe - X-rays: galaxies

Simbad objects: 1

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