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Published March 2020 | Accepted Version + Published
Journal Article Open

BAT AGN spectroscopic survey - XV: the high frequency radio cores of ultra-hard X-ray selected AGN


We have conducted 22 GHz radio imaging at 1 arcsec resolution of 100 low-redshift AGN selected at 14–195 keV by the Swift-BAT. We find a radio core detection fraction of 96 per cent, much higher than lower frequency radio surveys. Of the 96 radio-detected AGN, 55 have compact morphologies, 30 have morphologies consistent with nuclear star formation, and 11 have sub-kpc to kpc-scale jets. We find that the total radio power does not distinguish between nuclear star formation and jets as the origin of the radio emission. For 87 objects, we use optical spectroscopy to test whether AGN physical parameters are distinct between radio morphological types. We find that X-ray luminosities tend to be higher if the 22 GHz morphology is jet-like, but find no significant difference in other physical parameters. We find that the relationship between the X-ray and core radio luminosities is consistent with the L_R/L_X ∼ 10⁻⁵ of coronally active stars. We further find that the canonical fundamental planes of black hole activity systematically overpredict our radio luminosities, particularly for objects with star formation morphologies.

Additional Information

© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model). Received: 09 August 2019; Revision received: 12 December 2019; Accepted: 17 December 2019; Published: 03 January 2020. Support for KLS was provided by the National Aeronautics and Space Administration through Einstein Postdoctoral Fellowship Award Number PF7-180168, issued by the Chandra X-ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of the National Aeronautics Space Administration under contract NAS8-03060. CR acknowledges the Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT) + Programa de Atraccion e Insercion de Capital Humano Avanzado (PAI) Convocatoria Nacional subvencion a instalacion en la academia convocatoria año 2017 PAI77170080. KO is an International Research Fellow of the Japan Society for the Promotion of Science (JSPS) (ID:P17321). FR acknowledges support from Fondo Nacional de Desarrollo Cientifico y Tecnologico (FONDECYT) Postdoctorado 3180506; FR and FEB acknowledge support from CONICYT project Basal AFB-170002.

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Published - stz3608.pdf

Accepted Version - 2001.00877.pdf


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August 19, 2023
October 19, 2023