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.
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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, Astronomy Department | ||||||||||||||||||||||||||||
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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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