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  4. 4.09 Prodotti multimediali
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27239
Title: Phylogenetic Analyses of Quasars and Galaxi
Authors: Fraix-Burnet, Didier
MARZIANI, Paola 
D'ONOFRIO, MAURO
Issue Date: 2017
Volume: Quasars at all Cosmic Epochs
First Page: 11
Abstract: We have performed a cladistic analysis on two samples of 215 and 85 low-z quasars (z < 0.7) which were studied in several previous works and which offer a satisfactory coverage of the Eigenvector 1-derived main sequence. The data encompass accurate measurements of observational parameters which represent key aspects associated with the structural diversity of quasars. Cladistics is able to group sources radiating at higher Eddington ratios, as well as to separate radio-quiet (RQ) and radio-loud (RL) quasars. The analysis suggests a black hole mass threshold for powerful radio emission and also properly distinguishes core-dominated and lobe-dominated quasars, in accordance with the basic tenet of RL unification schemes. Considering that black hole mass provides a sort of ``arrow of time'' of nuclear activity, our result suggests that the ontogeny of black holes is represented by their monotonic increase in mass. More massive radio-quiet Population B sources at low-z become a more evolved counterpart of Population A i.e., wind dominated sources to which the ``local'' Narrow-Line Seyfert 1s belong. In addition to the analysis of luminous type 1 AGN and low-z quasars, we have applied cladistic techniques to a sample of viz. 4000 galaxies of the WINGS survey which are mostly quiescent or host modest star formation activity and low-luminosity AGNs. Preliminary results are given in this poster.
Conference Name: Quasars at all Cosmic Epochs
Conference Place: Padova, Italy
Conference Date: 2-7 Aprile, 2017
URI: http://hdl.handle.net/20.500.12386/27239
URL: https://zenodo.org/record/569436#.X0yg7NMzaRs
DOI: 10.5281/zenodo.569436
Bibcode ADS: 2017qace.confE..11F
Fulltext: open
Appears in Collections:4.09 Prodotti multimediali

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