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Beyond Simple AGN Unification with Chandra-observed 3CRR Sources by Kuraszkiewicz, Joanna; Wilkes, Belinda J.; Atanas, Adam; Buchner, Johannes; McDowell, Jonathan C.; Willner, S. P.; Ashby, Matthew L. N.; Azadi, Mojegan; Barthel, Peter; Haas, Martin; Worrall, Diana M.; Birkinshaw, Mark; Antonucci, Robert; Chini, Rolf; Fazio, Giovanni G.; Lawrence, Charles; Ogle, Patrick is a scholarly article available to read on EtoBox.

What is Beyond Simple AGN Unification with Chandra-observed 3CRR Sources about?

Low-frequency radio selection finds radio-bright galaxies regardless of the amount of obscuration by gas and dust. We report \chandra\ observations of a complete 178~MHz-selected, and so orientation unbiased, sample of 44 $0.5<z<1$ 3CRR sources. The sample is comprised of quasars and narrow-line radio galaxies (NLRGs) with similar radio luminosities, and the radio structure serves as both an age and an orientation indicator. Consistent with Unification, intrinsic obscuration (measured by \nh, X-ray hardness ratio, and X-ray luminosity) generally increases with inclination. However, the sample includes a population not seen in high-$z$ 3CRR sources: NLRGs viewed at intermediate inclination angles with \nh~$<10^{22}$~cm$^{-2}$. Multiwavelength analysis suggests these objects have lower $L/L_{\rm Edd}$ than typical NLRGs at similar orientation. Thus both orientation and $L/L_{\rm Edd}$ are important, and a "radiation-regulated Unification" provides a better explanation of the sample's observed properties. In comparison with the 3CRR sample at $1<z<2$, our lower-redshift sample shows a higher fraction of Compton-thin NLRGs (45\% vs.\ 29\%) but similar Compton-thick fraction (20\%), imp

Author

Kuraszkiewicz, Joanna; Wilkes, Belinda J.; Atanas, Adam; Buchner, Johannes; McDowell, Jonathan C.; Willner, S. P.; Ashby, Matthew L. N.; Azadi, Mojegan; Barthel, Peter; Haas, Martin; Worrall, Diana M.; Birkinshaw, Mark; Antonucci, Robert; Chini, Rolf; Fazio, Giovanni G.; Lawrence, Charles; Ogle, Patrick

Published

2021

Language

EN