### 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 ( 10^{46}erg 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 language | English (US) |
---|---|

Article number | 70 |

Journal | Astrophysical Journal |

Volume | 832 |

Issue number | 1 |

DOIs | |

State | Published - Nov 20 2016 |

Externally published | Yes |

### Fingerprint

### Keywords

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

### ASJC Scopus subject areas

- Astronomy and Astrophysics
- Space and Planetary Science

### Cite this

*Astrophysical Journal*,

*832*(1), [70]. https://doi.org/10.3847/0004-637X/832/1/70

**THE CHANDRA COSMOS LEGACY SURVEY : CLUSTERING of X-RAY-SELECTED AGNs at 2.9 ≤ z ≤ 5.5 USING PHOTOMETRIC REDSHIFT PROBABILITY DISTRIBUTION FUNCTIONS.** / Allevato, V.; Civano, F.; Finoguenov, A.; Marchesi, S.; Shankar, F.; Zamorani, G.; Hasinger, G.; Salvato, M.; Miyaji, T.; Gilli, R.; Cappelluti, Nico; Brusa, M.; Suh, H.; Lanzuisi, G.; Trakhtenbrot, B.; Griffiths, R.; Vignali, C.; Schawinski, K.; Karim, A.

Research output: Contribution to journal › Article

*Astrophysical Journal*, vol. 832, no. 1, 70. https://doi.org/10.3847/0004-637X/832/1/70

}

TY - JOUR

T1 - THE CHANDRA COSMOS LEGACY SURVEY

T2 - CLUSTERING of X-RAY-SELECTED AGNs at 2.9 ≤ z ≤ 5.5 USING PHOTOMETRIC REDSHIFT PROBABILITY DISTRIBUTION FUNCTIONS

AU - Allevato, V.

AU - Civano, F.

AU - Finoguenov, A.

AU - Marchesi, S.

AU - Shankar, F.

AU - Zamorani, G.

AU - Hasinger, G.

AU - Salvato, M.

AU - Miyaji, T.

AU - Gilli, R.

AU - Cappelluti, Nico

AU - Brusa, M.

AU - Suh, H.

AU - Lanzuisi, G.

AU - Trakhtenbrot, B.

AU - Griffiths, R.

AU - Vignali, C.

AU - Schawinski, K.

AU - Karim, A.

PY - 2016/11/20

Y1 - 2016/11/20

N2 - 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.

AB - 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.

KW - dark matter

KW - galaxies: active

KW - large-scale structure of universe

KW - surveys

KW - X-rays: general

UR - http://www.scopus.com/inward/record.url?scp=84996566018&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84996566018&partnerID=8YFLogxK

U2 - 10.3847/0004-637X/832/1/70

DO - 10.3847/0004-637X/832/1/70

M3 - Article

AN - SCOPUS:84996566018

VL - 832

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 70

ER -