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BAT AGN Spectroscopic Survey – III. An observed link between AGN Eddington ratio and narrow-emission-line ratios

Oh, Kyuseok and Schawinski, Kevin and Koss, Michael and Trakhtenbrot, Benny and Lamperti, Isabella and Ricci, Claudio and Mushotzky, Richard and Veilleux, Sylvain and Berney, Simon and Crenshaw, D. Michael and Gehrels, Neil and Harrison, Fiona and Masetti, Nicola and Soto, Kurt T. and Stern, Daniel and Treister, Ezequiel and Ueda, Yoshihiro (2017) BAT AGN Spectroscopic Survey – III. An observed link between AGN Eddington ratio and narrow-emission-line ratios. Monthly Notices of the Royal Astronomical Society, 464 (2). pp. 1466-1473. ISSN 0035-8711. https://resolver.caltech.edu/CaltechAUTHORS:20170303-064801537

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Abstract

We investigate the observed relationship between black hole mass (MBH), bolometric luminosity (Lbol) and Eddington ratio (λEdd) with optical emission-line ratios ([N ii] λ6583/Hα, [S ii] λλ6716, 6731/Hα, [O i] λ6300/Hα, [O iii] λ5007/Hβ, [Ne iii] λ3869/Hβ and He ii λ4686/Hβ) of hard X-ray-selected active galactic nuclei (AGN) from the BAT AGN Spectroscopic Survey. We show that the [N ii] λ6583/Hα ratio exhibits a significant correlation with λEdd (RPear = −0.44, p-value = 3 × 10−13, σ = 0.28 dex), and the correlation is not solely driven by MBH or Lbol. The observed correlation between [N ii] λ6583/Hα ratio and MBH is stronger than the correlation with Lbol, but both are weaker than the λEdd correlation. This implies that the large-scale narrow lines of AGN host galaxies carry information about the accretion state of the AGN central engine. We propose that [N ii] λ6583/Hα is a useful indicator of Eddington ratio with 0.6 dex of rms scatter, and that it can be used to measure λEdd and thus MBH from the measured Lbol, even for high-redshift obscured AGN. We briefly discuss possible physical mechanisms behind this correlation, such as the mass–metallicity relation, X-ray heating, and radiatively driven outflows.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/stw2467DOIArticle
https://arxiv.org/abs/1609.08625arXivDiscussion Paper
ORCID:
AuthorORCID
Oh, Kyuseok0000-0002-5037-951X
Schawinski, Kevin0000-0001-5464-0888
Koss, Michael0000-0002-7998-9581
Trakhtenbrot, Benny0000-0002-3683-7297
Lamperti, Isabella0000-0003-3336-5498
Ricci, Claudio0000-0001-5231-2645
Veilleux, Sylvain0000-0002-3158-6820
Crenshaw, D. Michael0000-0002-6465-3639
Harrison, Fiona0000-0003-2992-8024
Masetti, Nicola0000-0001-9487-7740
Stern, Daniel0000-0003-2686-9241
Treister, Ezequiel0000-0001-7568-6412
Ueda, Yoshihiro0000-0001-7821-6715
Additional Information:© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Received: 21 June 2016. Revision Received: 24 September 2016. Accepted: 27 September 2016. Published: 28 September 2016. KO and KS acknowledge support from the Swiss National Science Foundation (SNSF) through Project grants 200021_157021, PP00P2_138979, and PP00P2_166159. MK acknowledges support from the SNSF through the Ambizione fellowship grant PZ00P2_154799/1. MK and KS acknowledge support from the SNFS through the Ambizione fellowship grant PP00P2 138979/1. CR acknowledges financial support from the CONICYT-Chile ‘EMBIGGEN’ Anillo (grant ACT1101), FONDECYT 1141218, Basal-CATA PFB–06/2007 and China-CONICYT fund. ET acknowledges support from the CONICYT-Chile ‘EMBIGGEN’ Anillo (grant ACT1101), FONDECYT 1160999, and Basal-CATA PFB–06/2007. The work of DS was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. This research has made use of NASA's ADS Service. Facilities: Swift, UH:2.2m, Sloan, KPNO:2.1m, FLWO:1.5m (FAST), Shane (Kast Double spectrograph), CTIO:1.5m, Hale, Gemini: South, Gemini: Gillett, Radcliffe, Perkins.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
Swiss National Science Foundation (SNSF)200021_157021
Swiss National Science Foundation (SNSF)PP00P2_138979
Swiss National Science Foundation (SNSF)PP00P2_166159
Swiss National Science Foundation (SNSF)PZ00P2_154799/1
Swiss National Science Foundation (SNSF)PP00P2 138979/1
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)ACT1101
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1141218
Basal-CATA PFB–06/2007
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1160999
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:black hole physics galaxies: active galaxies: nuclei quasars: general
Issue or Number:2
Record Number:CaltechAUTHORS:20170303-064801537
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170303-064801537
Official Citation:Kyuseok Oh, Kevin Schawinski, Michael Koss, Benny Trakhtenbrot, Isabella Lamperti, Claudio Ricci, Richard Mushotzky, Sylvain Veilleux, Simon Berney, D. Michael Crenshaw, Neil Gehrels, Fiona Harrison, Nicola Masetti, Kurt T. Soto, Daniel Stern, Ezequiel Treister, Yoshihiro Ueda; BAT AGN Spectroscopic Survey – III. An observed link between AGN Eddington ratio and narrow-emission-line ratios. Mon Not R Astron Soc 2017; 464 (2): 1466-1473. doi: 10.1093/mnras/stw2467
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74679
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:03 Mar 2017 15:55
Last Modified:04 Nov 2019 05:56

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