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Constraining jet production scenarios by studies of Narrow-Line-Radio-Galaxies by Sikora, Marek; Stasińska, Grażyna; Kozieł-Wierzbowska, Dorota; Madejski, Greg M.; Asari, Natalia V. is a scholarly article available to read on EtoBox.

What is Constraining jet production scenarios by studies of Narrow-Line-Radio-Galaxies about?

We study a large sample of narrow-line radio galaxies (NLRGs) with extended radio structures. Using 1.4 GHz radio luminosities, $L_{1.4}$, narrow optical emission line luminosities, $L_{\oiii}$ and $L_{H_{\alpha}}$, as well as black hole masses $M_{BH}$ derived from stellar velocity dispersions measured from the optical spectra obtained with the Sloan Digital Sky Survey, we find that: (i) NLRGs cover about 4 decades of the Eddington ratio, $\lambda \equiv L_{bol}/L_{Edd} \propto L_{line}/M_{BH}$; (ii) $L_{1.4}/M_{BH}$ strongly correlates with $\lambda$; (iii) radio-loudness, ${\cal R} \equiv L_{1.4}/L_{line}$, strongly anti-correlates with $\lambda$. A very broad range of the Eddington ratio indicates that the parent population of NLRGs includes both radio-loud quasars (RLQs) and broad-line radio galaxies (BLRGs). The correlations they obey and their high jet production efficiencies favor a jet production model which involves the so-called 'magnetically choked' accretion scenario. In this model, production of the jet is dominated by the Blandford-Znajek mechanism, and the magnetic fields in the vicinity of the central black hole are confined by the ram pressure of the accretion flo

Author

Sikora, Marek; Stasińska, Grażyna; Kozieł-Wierzbowska, Dorota; Madejski, Greg M.; Asari, Natalia V.

Published

2012

Language

EN