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Abstract: In the context of the evolution of large structures in the Universe, it isunclear whether active galaxies are a phase which each galaxy undergoes, andwhat is the importance of the evolution of black holes in their centers. Binaryblack hole BBH systems could play a key role in our understanding of theabove question.We investigate the Caltech-Jodrell Bank flat-spectrum CJF sample forevidence in favor of the merger-driven evolution scheme of active galaxies andsearch tracer-systems of AGN evolution and possible indications of BBHcandidates. We discuss the validity and ambiguity of such indications andformulate a set of selection criteria for the detection of such systems. Weconduct an extensive literature search for all available multi-wavelengthinformation, concentrating on the optical and infrared regime, in addition tomorphological information of the CJF sources. We analyze the statistics of thissample, in terms of these properties.We find 1 ULIRG Mrk 231 included in the CJF, prototype of a transitorysystem. In total 28.6% of the CJF sources with z<0.4 are distorted or have acompanion. Given the unbiased sample used here, this provides strong evidencefor the ubiquity of the merger phenomenon in the context of active galaxies. Wefind a correlation between the radio and the near-infrared luminosity for thehigh-luminosity sources, interpreted in the context of the interplay between astar-formation and AGN component. We find a connection between variability andevolutionary transitory systems, as selected through their near-infraredcolors. We select 28 sources that trace the different evolution phases of anAGN, as well as a number of the most promising BBH candidates. We find 4sources with almost periodical variability in the optical and radio on similartimescales.



Autor: Marios Karouzos, Silke Britzen, Andreas Eckart, Arno Witzel, Anton Zensus

Fuente: https://arxiv.org/







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