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How does the polar dust affect the correlation between dust covering factor and Eddington ratio in type 1 quasars selected from the Sloan Digital Sky Survey Data Release 16?

How does the polar dust affect the correlation between dust covering factor and Eddington ratio in type 1 quasars selected from the Sloan Digital Sky Survey Data Release 16?
How does the polar dust affect the correlation between dust covering factor and Eddington ratio in type 1 quasars selected from the Sloan Digital Sky Survey Data Release 16?
We revisit the dependence of the covering factor (CF) of dust torus on physical properties of active galactic nuclei (AGNs) by taking into account an AGN polar dust emission. The CF is converted from a ratio of infrared (IR) luminosity contributed from AGN dust torus (${L}_{\mathrm{IR}}^{\mathrm{torus}}$) and AGN bolometric luminosity (Lbol), by assuming a nonlinear relation between luminosity ratio and intrinsic CF. We select 37,181 type 1 quasars at z < 0.7 from the Sloan Digital Sky Survey Data Release 16 quasar catalog. Their Lbol, black hole mass (MBH), and Eddington ratio (λEdd) are derived by spectral fitting with QSFit. We conduct spectral energy distribution decomposition by using X-CIGALE with a clumpy torus and polar dust model to estimate ${L}_{\mathrm{IR}}^{\mathrm{torus}}$ without being affected by the contribution of stellar and AGN polar dust to IR emission. For 5752 quasars whose physical quantities are securely determined, we perform a correlation analysis on CF and (i) Lbol, (ii) MBH, and (iii) λEdd. As a result, anticorrelations for CF–Lbol, CF–MBH, and CF–λEdd are confirmed. We find that incorporating the AGN polar dust emission makes those anticorrelations stronger compared to those without considering it. This indicates that polar dust wind probably driven by AGN radiative pressure is one of the key components to regulate obscuring material of AGNs.
0004-637X
Toba, Yoshiki
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Ueda, Yoshihiro
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Gandhi, Poshak
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Ricci, Claudio
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Burgarella, Denis
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Buat, Veronique
c3e069af-ff40-42b5-8c8d-78aa0a283ac3
Nagao, Tohru
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Oyabu, Shinki
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Matsuhara, Hideo
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Hsieh, Bau-Ching
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Toba, Yoshiki
f6b69582-a663-4b2b-81cd-ae8b44591360
Ueda, Yoshihiro
6ce2216a-2e60-4704-83c7-457212870a0b
Gandhi, Poshak
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9
Ricci, Claudio
4c4e4a38-d158-422c-bc9c-6df21d4b6886
Burgarella, Denis
4293fe39-6051-494c-946d-649f87b652bc
Buat, Veronique
c3e069af-ff40-42b5-8c8d-78aa0a283ac3
Nagao, Tohru
51810782-2947-46a8-860c-0787cb722689
Oyabu, Shinki
345e9536-7d0d-434e-a707-fdeeb73e39b2
Matsuhara, Hideo
e326e439-d547-4897-a7a8-d3fa9a6cd38a
Hsieh, Bau-Ching
dfc064cc-aa4a-42dd-a802-ac36fc3e5d19

Toba, Yoshiki, Ueda, Yoshihiro, Gandhi, Poshak, Ricci, Claudio, Burgarella, Denis, Buat, Veronique, Nagao, Tohru, Oyabu, Shinki, Matsuhara, Hideo and Hsieh, Bau-Ching (2021) How does the polar dust affect the correlation between dust covering factor and Eddington ratio in type 1 quasars selected from the Sloan Digital Sky Survey Data Release 16? Astrophysical Journal, 912 (2). (doi:10.3847/1538-4357/abe94a).

Record type: Article

Abstract

We revisit the dependence of the covering factor (CF) of dust torus on physical properties of active galactic nuclei (AGNs) by taking into account an AGN polar dust emission. The CF is converted from a ratio of infrared (IR) luminosity contributed from AGN dust torus (${L}_{\mathrm{IR}}^{\mathrm{torus}}$) and AGN bolometric luminosity (Lbol), by assuming a nonlinear relation between luminosity ratio and intrinsic CF. We select 37,181 type 1 quasars at z < 0.7 from the Sloan Digital Sky Survey Data Release 16 quasar catalog. Their Lbol, black hole mass (MBH), and Eddington ratio (λEdd) are derived by spectral fitting with QSFit. We conduct spectral energy distribution decomposition by using X-CIGALE with a clumpy torus and polar dust model to estimate ${L}_{\mathrm{IR}}^{\mathrm{torus}}$ without being affected by the contribution of stellar and AGN polar dust to IR emission. For 5752 quasars whose physical quantities are securely determined, we perform a correlation analysis on CF and (i) Lbol, (ii) MBH, and (iii) λEdd. As a result, anticorrelations for CF–Lbol, CF–MBH, and CF–λEdd are confirmed. We find that incorporating the AGN polar dust emission makes those anticorrelations stronger compared to those without considering it. This indicates that polar dust wind probably driven by AGN radiative pressure is one of the key components to regulate obscuring material of AGNs.

Text
How Does the Polar Dust Affect the Correlation between Dust Covering Factor and Eddington Ratio in Type 1 Quasars Selected from the Sloan Digital Sky Survey Data Release 16 - Accepted Manuscript
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Accepted/In Press date: 8 February 2021
e-pub ahead of print date: 7 May 2021
Additional Information: arxiv is am

Identifiers

Local EPrints ID: 449648
URI: http://eprints.soton.ac.uk/id/eprint/449648
ISSN: 0004-637X
PURE UUID: fe713459-735b-4089-bc72-866983d645f2
ORCID for Poshak Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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Date deposited: 10 Jun 2021 16:30
Last modified: 11 Jun 2021 01:45

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Contributors

Author: Yoshiki Toba
Author: Yoshihiro Ueda
Author: Poshak Gandhi ORCID iD
Author: Claudio Ricci
Author: Denis Burgarella
Author: Veronique Buat
Author: Tohru Nagao
Author: Shinki Oyabu
Author: Hideo Matsuhara
Author: Bau-Ching Hsieh

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