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http://hdl.handle.net/20.500.12386/26703
Titolo: | BAT AGN Spectroscopic Survey - III. An observed link between AGN Eddington ratio and narrow-emission-line ratios | Autori: | Oh, Kyuseok Schawinski, Kevin Koss, Michael Trakhtenbrot, Benny Lamperti, Isabella Ricci, Claudio Mushotzky, Richard Veilleux, Sylvain Berney, Simon Crenshaw, D. Michael Gehrels, Neil Harrison, Fiona MASETTI, NICOLA Soto, Kurt T. Stern, Daniel Treister, Ezequiel Ueda, Yoshihiro |
Data pubblicazione: | 2017 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 464 | Fascicolo: | 2 | Da pagina:: | 1466 | Abstract: | We investigate the observed relationship between black hole mass (M<SUB>BH</SUB>), bolometric luminosity (L<SUB>bol</SUB>) and Eddington ratio (λ<SUB>Edd</SUB>) 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 λ<SUB>Edd</SUB> (R<SUB>Pear</SUB> = -0.44, p-value = 3 × 10<SUP>-13</SUP>, σ = 0.28 dex), and the correlation is not solely driven by M<SUB>BH</SUB> or L<SUB>bol</SUB>. The observed correlation between [N II] λ6583/Hα ratio and M<SUB>BH</SUB> is stronger than the correlation with L<SUB>bol</SUB>, but both are weaker than the λ<SUB>Edd</SUB> 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 λ<SUB>Edd</SUB> and thus M<SUB>BH</SUB> from the measured L<SUB>bol</SUB>, 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. | URI: | http://hdl.handle.net/20.500.12386/26703 | URL: | https://academic.oup.com/mnras/article/464/2/1466/2282855 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw2467 | Bibcode ADS: | 2017MNRAS.464.1466O | Fulltext: | open |
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