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

X-ray bolometric corrections for Compton-thick active galactic nuclei
X-ray bolometric corrections for Compton-thick active galactic nuclei
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 $L_{Bol}\approx10^{42}-10^{45}$ erg/s is log$_{10}\kappa_{Bol}=1.44\pm0.12$ with an intrinsic scatter of $\sim0.2$ 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.
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Astrophysics of Galaxies
0004-637X
Brightman, M.
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Baloković, M.
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Ballantyne, D. R.
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Bauer, F. E.
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Boorman, P.
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Buchner, J.
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Brandt, W. N.
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Comastri, A.
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Del Moro, A.
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Farrah, D.
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Gandhi, P.
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Harrison, F. A.
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Koss, M.
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Lanz, L.
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Masini, A.
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Ricci, C.
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Stern, D.
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Vasudevan, R.
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Walton, D. J.
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Brightman, M.
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Baloković, M.
aab173bc-002d-417d-aae0-2c0fddb46745
Ballantyne, D. R.
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Bauer, F. E.
053d4efb-90bb-4bb2-a1e2-2a8d34e21aad
Boorman, P.
e5240793-37c1-4b7b-9840-3b996cef8dd3
Buchner, J.
4a6fc6ec-311f-49c1-8d8b-1845ddad82bc
Brandt, W. N.
2ccd8265-d819-4b7a-8ec8-ced4bfb7baeb
Comastri, A.
8068001f-aff5-4dcd-906c-1c91af4bad97
Del Moro, A.
431893a9-0891-48b8-bcb9-0ed4cec61f5e
Farrah, D.
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Gandhi, P.
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Harrison, F. A.
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Koss, M.
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Lanz, L.
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Masini, A.
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Ricci, C.
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Stern, D.
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Vasudevan, R.
d6534b36-7bfe-4bb5-a9ed-86aaf6efb839
Walton, D. J.
3cf6ea78-7dd5-4765-8c09-ba2af76f11e7

Brightman, M., Baloković, M., Ballantyne, D. R., Bauer, F. E., Boorman, P., Buchner, J., Brandt, W. N., Comastri, A., Del Moro, A., Farrah, D., Gandhi, P., Harrison, F. A., Koss, M., Lanz, L., Masini, A., Ricci, C., Stern, D., Vasudevan, R. and Walton, D. J. (2017) X-ray bolometric corrections for Compton-thick active galactic nuclei. The Astrophysical Journal. (In Press)

Record type: Article

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 $L_{Bol}\approx10^{42}-10^{45}$ erg/s is log$_{10}\kappa_{Bol}=1.44\pm0.12$ with an intrinsic scatter of $\sim0.2$ 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.

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Accepted/In Press date: 1 May 2017
Keywords: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Astrophysics of Galaxies
Organisations: Astronomy Group, Physics & Astronomy

Identifiers

Local EPrints ID: 411349
URI: https://eprints.soton.ac.uk/id/eprint/411349
ISSN: 0004-637X
PURE UUID: 736866f1-4bbc-4059-b18e-b34b2b4d6ade
ORCID for P. Boorman: ORCID iD orcid.org/0000-0001-9379-4716
ORCID for P. Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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Date deposited: 19 Jun 2017 16:31
Last modified: 14 Mar 2019 01:32

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Contributors

Author: M. Brightman
Author: M. Baloković
Author: D. R. Ballantyne
Author: F. E. Bauer
Author: P. Boorman ORCID iD
Author: J. Buchner
Author: W. N. Brandt
Author: A. Comastri
Author: A. Del Moro
Author: D. Farrah
Author: P. Gandhi ORCID iD
Author: F. A. Harrison
Author: M. Koss
Author: L. Lanz
Author: A. Masini
Author: C. Ricci
Author: D. Stern
Author: R. Vasudevan
Author: D. J. Walton

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