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The XXL Survey: XXXII. Spatial clustering of the XXL-S AGN

Plionis, M.; Koutoulidis, L.; Koulouridis, E.; Moscardini, L.; Lidman, C.; Pierre, M.; Adami, C.; Chiappetti, L.; Faccioli, L.; Fotopoulou, S.; Pacaud, F.; Paltani, S.

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Authors

M. Plionis

L. Koutoulidis

E. Koulouridis

L. Moscardini

C. Lidman

M. Pierre

C. Adami

L. Chiappetti

L. Faccioli

S. Fotopoulou

F. Pacaud

S. Paltani



Abstract

The XMM-XXL Survey spans two fields of 25 deg2 each observed for more than 6 Ms with XMM, which provided a sample of tens of thousands of point sources with a flux limit of ~2.2 × 10−15 and ~1.4 × 10−14 erg s−1 cm2, corresponding to 50% of the area curve, in the soft band (0.5–2 keV) and hard band (2–10 keV), respectively. In this paper we present the spatial clustering properties of ~3100 and ~1900 X-ray active galactic nuclei (AGNs) in the soft and hard bands, respectively, which have been spectroscopically observed with the AAOmega facility. This sample is 90% redshift complete down to an optical magnitude limit of r ≲ 21.8. The sources span the redshift interval 0 < z < 5.2, although in the current analysis we limit our samples to z ≤ 3, with corresponding sample median values of z̅ ≃ 0.96 and 0.79 for the soft band and hard band, respectively. We employ the projected two-point correlation function to infer the spatial clustering and find a correlation length r0 = 7.0(±0.34) and 6.42(±0.42) h−1 Mpc, respectively, for the soft- and hard-band detected sources with a slope for both cases of γ = 1.44(±0.1). The power-law clustering was detected within comoving separations of 1 and ~25 h−1 Mpc. These results, as well as those derived in two separate redshift ranges, provide bias factors of the corresponding AGN host dark matter halos that are consistent with a halo mass of log10[Mh∕(h−1M⊙)] = 13.04 ± 0.06, confirming the results of most recent studies based on smaller X-ray AGN samples.

Citation

Plionis, M., Koutoulidis, L., Koulouridis, E., Moscardini, L., Lidman, C., Pierre, M., …Paltani, S. (2018). The XXL Survey: XXXII. Spatial clustering of the XXL-S AGN. Astronomy & Astrophysics, 620, Article A17. https://doi.org/10.1051/0004-6361/201832970

Journal Article Type Article
Acceptance Date Apr 9, 2018
Online Publication Date Nov 20, 2018
Publication Date Nov 20, 2018
Deposit Date Dec 6, 2018
Publicly Available Date Dec 6, 2018
Journal Astronomy and astrophysics.
Print ISSN 0004-6361
Electronic ISSN 1432-0746
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 620
Article Number A17
DOI https://doi.org/10.1051/0004-6361/201832970
Public URL https://durham-repository.worktribe.com/output/1341565

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Copyright Statement
Reproduced with permission from Astronomy & Astrophysics, © ESO.






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