2018A&A...620A..17P -
Astronomy and Astrophysics, volume 620A, 17-17 (2018/12-1)
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. and PALTANI S.
Abstract (from CDS):
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 ∼2.2x10–15 and ∼1.4x10–14erg/s/cm2, corresponding to 50% of the area curve, in the soft band (0.5-2keV) and hard band (2-10keV), 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 {bar}z~=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–1Mpc, 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 ∼25h–1Mpc. 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.
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Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
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[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
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Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
quality : flag of quality
E ≥ 10"
D : 1-10" (and some old data)
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A : VLBI, Hipparcos
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14 29 59.98 +34 29 59.7
[
]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
quality : flag of quality
E ≥ 10"
D : 1-10" (and some old data)
C : 0.1-1"
B : 0.01-0.1" + 2MASS, Tyc
A : VLBI, Hipparcos
bibcode : bibcode of the coordinates reference
Gal
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(ep=J2000) :
057.44983 +67.28315
[
]
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects">
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