J/MNRAS/449/1422 2XMM AGN X-ray and mid-IR luminosities (Mateos+, 2015)
Revisiting the relationship between 6 µm and 2-10 keV continuum luminosities
of AGN.
Mateos S., Carrera F.J., Alonso-Herrero A., Rovilos E.,
Hernan-Caballero A., Barcons X., Blain A., Caccianiga A., Della Ceca R.,
Severgnini P.
<Mon. Not. R. Astron. Soc., 449, 1422-1440 (2015)>
=2015MNRAS.449.1422M 2015MNRAS.449.1422M (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; X-ray sources ; Infrared sources ;
Spectroscopy
Keywords: galaxies: active - quasars: supermassive black holes -
infrared: galaxies - X-rays: galaxies
Abstract:
We have determined the relation between the AGN luminosities at
rest-frame 6µm associated with the dusty torus emission and at
2-10keV energies using a complete, X-ray-flux-limited sample of 232
AGN drawn from the Bright Ultra-hard XMM-Newton Survey. The objects
have intrinsic X-ray luminosities between 1042 and 1046erg/s and
redshifts from 0.05 to 2.8. The rest-frame 6µm luminosities were
computed using data from the Wide-field Infrared Survey Explorer and
are based on a spectral energy distribution decomposition into AGN and
galaxy emission. The best-fitting relationship for the full sample is
consistent with being linear, L6µm∝L2-10keV0.99±0.03,
with intrinsic scatter, ΔlogL6µm∼0.35dex. The
L6µm/L2-10keV luminosity ratio is largely independent of the
line-of-sight X-ray absorption. Assuming a constant X-ray bolometric
correction, the fraction of AGN bolometric luminosity reprocessed in
the mid-IR decreases weakly, if at all, with the AGN luminosity, a
finding at odds with simple receding torus models. Type 2 AGN have
redder mid-IR continua at rest-frame wavelengths <12µm and are
overall ∼1.3-2 times fainter at 6µm than type 1 AGN at a given
X-ray luminosity. Regardless of whether type 1 and type 2 AGN have the
same or different nuclear dusty toroidal structures, our results imply
that the AGN emission at rest-frame 6µm is not isotropic due to
self-absorption in the dusty torus, as predicted by AGN torus models.
Thus, AGN surveys at rest-frame ∼6µm are subject to modest dust
obscuration biases.
Description:
Our AGN sample was drawn from the wide-angle BUXS (Mateos et al.
2012MNRAS.426.3271M 2012MNRAS.426.3271M). BUXS is a large, complete, flux-limited sample
of X-ray bright (f4.5-10keV>6x10-14erg/s/cm2) AGN detected
with the XMM-Newton observatory at 4.5-10 keV energies. The survey
is based on 381 high Galactic latitude (|b|>20°) XMM-Newton
observations having good quality for serendipitous source detection
that were used to derive extragalactic source count distributions at
intermediate X-ray fluxes (Mateos et al. 2008A&A...492...51M 2008A&A...492...51M). BUXS
contains 255 AGN, after removal of Galactic stars and known BL Lacs
(<3 per cent), detected over a total sky area of 44.43 deg2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 46 232 Properties of the AGN used in this study
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See also:
IX/50 : XMM-Newton Serendipitous Source Catalogue 3XMM-DR6
(XMM-SSC, 2016)
J/A+A/418/465 : Mid-infrared and hard X-ray emission in AGN (Lutz+, 2004)
J/A+A/493/339 : XMM-Newton serendipitous Survey. V. (Watson+, 2009)
J/MNRAS/416/1844 : 2XMM ultraluminous X-ray source candidates (Walton+, 2011)
J/ApJ/807/129 : X-ray to MIR luminosities relation of AGNs (Stern, 2015)
J/A+A/590/A80 : 2-10keV luminosity function of AGN (Ranalli+, 2016)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [2XMM]
5- 20 A16 --- 2XMM X-ray source name (2XMMi JHHMMSS.s+DDMMSS;
2XMM JHHMMSS.s+DDMMSS in Simbad) (1)
22- 24 F3.1 --- Class [1/2] Optical spectroscopic classification (2)
26- 30 F5.2 [10-7W] logLX Log of Xray luminosity from 2-10 keV (in erg/s)
(3)
32- 35 F4.2 [10-7W] e_logLX 1σ uncertainty in logLX (3)
37- 41 F5.2 [10-7W] logLIR Log of rest-frame 6 µm AGN luminosity
associated with the dusty torus emission
(in erg/s) (4)
43- 46 F4.2 [10-7W] e_logLIR 1σ uncertainty in logLIR (4)
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Note (1): The targets are listed in order of increasing right ascension.
Name as listed in the second incremental version of the Second
XMM-Newton Serendipitous Source Catalogue (2XMM-DR3; Watson et al.
2009, J/A+A/493/339).
Note (2): 137 objects are type 1 AGN (122 Seyfert 1s, 15 Seyfert 1.5s) and
95 type 2 AGN (3 Seyfert 1.8s, 14 Seyfert 1.9s and 78 Seyfert 2s).
Note (3): The luminosities have been corrected for X-ray absorption.
Note (4): The infrared luminosities have been corrected for both the accretion
disc and host galaxy emission.
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History:
From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 30-Nov-2017