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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?

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).

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
Restricted to Repository staff only until 7 May 2022.
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## More information

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.org/0000-0003-3105-2615

## Catalogue record

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

## Contributors

Author: Yoshiki Toba
Author: Yoshihiro Ueda
Author: Poshak Gandhi
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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