X-ray bolometric corrections for Compton-thick active galactic nuclei

Abstract

We present X-ray bolometric correction factors, ${\kappa }_{Bol}$ ($\equiv L_{Bol}/L_X$), for Compton-thick (CT) active galactic nuclei (AGN) with the aim of testing AGN torus models, probing orientation effects, and estimating the bolometric output of the most obscured AGN. We adopt bolometric luminosities, $L_{Bol}$, from literature infrared (IR) torus modeling and compile published intrinsic 2--10 keV X-ray luminosities, $L_X$, from X-ray torus modeling of NuSTAR data. Our sample consists of 10 local CT AGN where both of these estimates are available. We test for systematic differences in ${\kappa }_{Bol}$ values produced when using two widely used IR torus models and two widely used X-ray torus models, finding consistency within the uncertainties. We find that the mean ${\kappa }_{Bol}$ of our sample in the range $L_{Bol}\approx 10^{42}-10^{45}$ erg/s is log${}_{10}{\kappa }_{Bol}=1.44\pm 0.12$ with an intrinsic scatter of $\sim 0.2$ dex, and that our derived ${\kappa }_{Bol}$ values are consistent with previously established relationships between ${\kappa }_{Bol}$ and $L_{Bol}$ and ${\kappa }_{Bol}$ and Eddington ratio. We investigate if ${\kappa }_{Bol}$ is dependent on $N_H$ by comparing our results on CT AGN to published results on less-obscured AGN, finding no significant dependence. Since many of our sample are megamaser AGN, known to be viewed edge-on, and furthermore under the assumptions of AGN unification whereby unobscured AGN are viewed face-on, our result implies that the X-ray emitting corona is not strongly anisotropic. Finally, we present ${\kappa }_{Bol}$ values for CT AGN identified in X-ray surveys as a function of their observed $L_X$, where an estimate of their intrinsic $L_X$ is not available, and redshift, useful for estimating the bolometric output of the most obscured AGN across cosmic time.

Accepted for publication in ApJ

References in corpus (23)

• An Observational Determination of the Bolometric Quasar Luminosity Function
• Toward the Standard Population Synthesis Model of the X-Ray Background: Evolution of X-Ray Luminosity and Absorption Functions of Active Galactic Nuclei Including Compton-Thick Populations
• The X-ray-to-Optical Properties of Optically-Selected Active Galaxies Over Wide Luminosity and Redshift Ranges
• Piecing Together the X-ray Background: Bolometric Corrections for Active Galactic Nuclei
• Simultaneous X-ray/optical/UV snapshots of active galactic nuclei from XMM-Newton: spectral energy distributions for the reverberation mapped sample
• Obscuration-dependent evolution of Active Galactic Nuclei
• The 2-79 keV X-ray Spectrum of the Circinus Galaxy with NuSTAR, XMM-Newton and Chandra: a Fully Compton-Thick AGN
• Study on X-ray Spectra of Obscured AGNs based on Monte Carlo simulation - an interpretation of observed wide-band spectra
• The NuSTAR View of Nearby Compton-thick AGN: The Cases of NGC 424, NGC 1320 and IC 2560
• Compton thick active galactic nuclei in Chandra surveys
• On the difference of torus geometry between hidden and non-hidden broad line active galactic nuclei
• Mid-Infrared Properties of Luminous Infrared Galaxies II: Probing the Dust and Gas Physics of the GOALS Sample
• The variable hard X-ray emission of NGC4945 as observed by NuSTAR
• NuSTAR unveils a Compton-thick Type 2 quasar in Mrk 34
• Determining the covering factor of Compton-thick active galactic nuclei with NuSTAR
• Broadband Observations of the Compton-thick Nucleus of NGC 3393
• An X-ray spectral model for clumpy tori in active galactic nuclei
• The HELLAS2XMM survey. X. The bolometric output of luminous obscured quasars: The Spitzer perspective
• Compton Thick AGN in the 70 Month Swift-BAT All-Sky Hard X-ray Survey: a Bayesian approach
• A growth-rate indicator for Compton-thick active galactic nuclei
• IC 3639 - A new bona fide Compton thick AGN unveiled by NuSTAR
• On the Anisotropy of Nuclei Mid-Infrared Radiation in Nearby Active Galactic Nuclei
• Anisotropic radiation from accretion disc-coronae in active galactic nuclei

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