A flat spectrum candidate for a track-type high energy neutrino emission event, the case of blazar PKS 0723-008
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In this Letter we present a model for consecutive emission of low frequency gravitational waves, high energy neutrinos, ultra-high energy cosmic rays, and luminous radio afterglow, all generated by the merger of two supermassive black holes acting as engine. The main contributing events are the spin-flip of the dominant black hole, gravitational wave burst, final coalescence, followed by formation of a new jet, particle acceleration and interaction with the surrounding material (leading to a radio flux density peak and the hardening at radio frequencies). Cross-correlating the Parkes Catalogue and the 2nd Planck Catalogue of Compact Sources with the arrival direction of the track-type neutrino detections by the IceCube, two flat spectrum radio sources emerge as possible origin in the framework of the proposed model. We discuss the blazar PKS 0723-008 as an excellent candidate exhibiting key elements of this complex process, with traces of a spin-flip, high-energy neutrino emission, and five-fold increased radio flux density in the last decade.