LeMMINGs III. The e-MERLIN legacy survey of the Palomar sample: exploring the origin of nuclear radio emission in active and inactive galaxies through the [O III] - radio connection
Date Issued
2021
Author(s)
•
Williams, D. R. A.
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Beswick, R. J.
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McHardy, I.
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Dullo, B. T.
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Knapen, J. H.
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Zanisi, L.
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Argo, M. K.
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Aalto, S.
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Alberdi, A.
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Baan, W. A.
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Bendo, G. J.
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Fenech, D. M.
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Green, D. A.
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Klöckner, H. -R.
•
Körding, E.
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Maccarone, T. J.
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Marcaide, J. M.
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Mutie, I.
•
•
Pérez-Torres, M. A.
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Romero-Cañizales, C.
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Saikia, D. J.
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Saikia, P.
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Shankar, F.
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Spencer, R. E.
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Stevens, I. R.
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Uttley, P.
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Brinks, E.
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Corbel, S.
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Martí-Vidal, I.
•
Mundell, C. G.
•
Pahari, M.
•
Ward, M. J.
Abstract
What determines the nuclear radio emission in local galaxies? To address this question, we combine optical [O III] line emission, robust black hole (BH) mass estimates, and high-resolution e-MERLIN 1.5-GHz data, from the LeMMINGs survey, of a statistically complete sample of 280 nearby optically active (LINER and Seyfert) and inactive [H II and absorption line galaxies (ALGs)] galaxies. Using [O III] luminosity ($L_{\rm [O\, \small {III}]}$) as a proxy for the accretion power, local galaxies follow distinct sequences in the optical-radio planes of BH activity, which suggest different origins of the nuclear radio emission for the optical classes. The 1.5-GHz radio luminosity of their parsec-scale cores (Lcore) is found to scale with BH mass (MBH) and [O III] luminosity. Below MBH ~ 106.5 M⊙, stellar processes from non-jetted H II galaxies dominate with $L_{\rm core} \propto M_{\rm BH}^{0.61\pm 0.33}$ and $L_{\rm core} \propto L_{\rm [O\, \small {III}]}^{0.79\pm 0.30}$. Above MBH ~ 106.5 M⊙, accretion-driven processes dominate with $L_{\rm core} \propto M_{\rm BH}^{1.5-1.65}$ and $L_{\rm core} \propto L_{\rm [O\, \small {III}]}^{0.99-1.31}$ for active galaxies: radio-quiet/loud LINERs, Seyferts, and jetted H II galaxies always display (although low) signatures of radio-emitting BH activity, with $L_{\rm 1.5\, GHz}\gtrsim 10^{19.8}$ W Hz-1 and MBH ≳ 107 M⊙, on a broad range of Eddington-scaled accretion rates ($\dot{m}$). Radio-quiet and radio-loud LINERs are powered by low-$\dot{m}$ discs launching sub-relativistic and relativistic jets, respectively. Low-power slow jets and disc/corona winds from moderately high to high-$\dot{m}$ discs account for the compact and edge-brightened jets of Seyferts, respectively. Jetted H II galaxies may host weakly active BHs. Fuel-starved BHs and recurrent activity account for ALG properties. In conclusion, specific accretion-ejection states of active BHs determine the radio production and the optical classification of local active galaxies.
Volume
508
Issue
2
Start page
2019
Issn Identifier
0035-8711
Ads BibCode
2021MNRAS.508.2019B
Rights
open.access
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