Black hole mass estimates in quasars. A comparative analysis of high- and low-ionization lines

PM acknowledges the Programa de Estancias de Investigacion (PREI) No. DGAP/DFA/2192/2018 of UNAM, where this paper was completed. The relevant research is part of the projects 176001 "Astrophysical spectroscopy of extragalactic objects" and 176003 "Gravitation and structure of universe on large scales" supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia. MLMA acknowledges a CONACyT postdoctoral fellowship, and wishes to thank the IAA for support during her postdoctoral stay from February 2016 to July 2018. MLMA acknowledges a CONACyT postdoctoral fellowship and National Science Centre, Poland, grant No. 2017/26/A/ST9/00756 (Maestro 9). AdO and MLMA acknowledge financial support from the Spanish Ministry of Economy and Competitiveness through grant AYA2016-76682-C3-1-P. AdO acknowledges financial support from the State Agency for Research of the Spanish MCIU through the "Center of Excellence Severo Ochoa" award for the Instituto de Astrofisica de Andalucia (SEV-2017-0709). MLMA, PM and MDO acknowledge funding from the INAF PRIN-SKA 2017 program 1.05.01.88.04. DD and AN acknowledge support from CONACyT through grant CB221398. DD also thanks for support from grants IN108715 and IN113719 PAPIIT, DGAPA, UNAM. MAMC was partially supported by the Spanish Research project MTM2015-64095-P and by Diputacion General de Aragon, Group E24-17R.