THE CHANDRA COSMOS LEGACY SURVEY: CLUSTERING of X-RAY-SELECTED AGNs at 2.9 ≤ z ≤ 5.5 USING PHOTOMETRIC REDSHIFT PROBABILITY DISTRIBUTION FUNCTIONS

V. Allevato, F. Civano, A. Finoguenov, S. Marchesi, F. Shankar, G. Zamorani, G. Hasinger, M. Salvato, T. Miyaji, R. Gilli, N. Cappelluti, M. Brusa, H. Suh, G. Lanzuisi, B. Trakhtenbrot, R. Griffiths, C. Vignali, K. Schawinski, A. Karim

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13 Scopus citations

Abstract

We present the measurement of the projected and redshift-space two-point correlation function (2pcf) of the new catalog of Chandra COSMOS-Legacy active galactic nucleus (AGN) at 2.9 ≤ z ≤ 5.5 ( 1046erg s-1) using the generalized clustering estimator based on phot-z probability distribution functions in addition to any available spec-z. We model the projected 2pcf, estimated using π max = 200 h-1 Mpc with the two-halo term and we derive a bias at z ∼ 3.4 equal to b = , which corresponds to a typical mass of the hosting halos of log M h = h-1 M o. A similar bias is derived using the redshift-space 2pcf, modeled including the typical phot-z error σ z = 0.052 of our sample at z ≥ 2.9. Once we integrate the projected 2pcf up to π max = 200 h-1 Mpc, the bias of XMM and Chandra COSMOS at z = 2.8 used in Allevato et al. is consistent with our results at higher redshifts. The results suggest only a slight increase of the bias factor of COSMOS AGNs at z 3 with the typical hosting halo mass of moderate-luminosity AGNs almost constant with redshift and equal to log M h = at z = 2.8 and log M h = at z ∼ 3.4, respectively. The observed redshift evolution of the bias of COSMOS AGNs implies that moderate-luminosity AGNs still inhabit group-sized halos at z 3, but slightly less massive than observed in different independent studies using X-ray AGNs at z ≤ 2.

Original languageEnglish (US)
Article number70
JournalAstrophysical Journal
Volume832
Issue number1
DOIs
StatePublished - Nov 20 2016
Externally publishedYes

Keywords

  • X-rays: general
  • dark matter
  • galaxies: active
  • large-scale structure of universe
  • surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Allevato, V., Civano, F., Finoguenov, A., Marchesi, S., Shankar, F., Zamorani, G., Hasinger, G., Salvato, M., Miyaji, T., Gilli, R., Cappelluti, N., Brusa, M., Suh, H., Lanzuisi, G., Trakhtenbrot, B., Griffiths, R., Vignali, C., Schawinski, K., & Karim, A. (2016). THE CHANDRA COSMOS LEGACY SURVEY: CLUSTERING of X-RAY-SELECTED AGNs at 2.9 ≤ z ≤ 5.5 USING PHOTOMETRIC REDSHIFT PROBABILITY DISTRIBUTION FUNCTIONS. Astrophysical Journal, 832(1), [70]. https://doi.org/10.3847/0004-637X/832/1/70