Beyond Simple AGN Unification with Chandra-observed 3CRR Sources at 0.5 < <i>z</i> < 1

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dc.contributor.authorKuraszkiewicz, Joanna
dc.contributor.authorWilkes, Belinda J.
dc.contributor.authorAtanas, Adam
dc.contributor.authorBuchner, Johannes
dc.contributor.authorMcDowell, Jonathan C.
dc.contributor.authorWillner, S. P.
dc.contributor.authorAshby, Matthew L. N.
dc.contributor.authorAzadi, Mojegan
dc.contributor.authorBarthel, Peter
dc.contributor.authorHaas, Martin
dc.contributor.authorWorrall, Diana M.
dc.contributor.authorBirkinshaw, Mark
dc.contributor.authorAntonucci, Robert
dc.contributor.authorChini, Rolf
dc.contributor.authorFazio, Giovanni G.
dc.contributor.authorLawrence, Charles
dc.contributor.authorOgle, Patrick
dc.date.accessioned2025-01-20T22:20:59Z
dc.date.available2025-01-20T22:20:59Z
dc.date.issued2021
dc.description.abstractLow-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 N (H), 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 N (H) < 10(22) cm(-2). Multiwavelength analysis suggests that these objects have lower L/L (Edd) than typical NLRGs at similar orientation. Thus, both orientation and L/L (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% versus 29%) but a similar Compton-thick fraction (20%), implying a larger covering factor of Compton-thin material at intermediate viewing angles and thus a more "puffed-up" torus atmosphere. We posit that this is due to a range of L/L (Edd) extending to lower values in this sample. In contrast, at high redshifts, the narrower range and high L/L (Edd) values allowed orientation (and so simple unification) to dominate the sample's observed properties.
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-4357/abf3c0
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.3847/1538-4357/abf3c0
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/94638
dc.identifier.wosidWOS:000657503100001
dc.issue.numero2
dc.language.isoen
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.titleBeyond Simple AGN Unification with Chandra-observed 3CRR Sources at 0.5 < <i>z</i> < 1
dc.typeartículo
dc.volumen913
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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