@Article{CerqueiraCamposRoRiMaPrDa:2021:PhPrEm,
               author = "Cerqueira Campos, Fernando Cust{\'o}dio and Rodriguez Ardila, A. 
                         and Riffel, R. and Marinello, M. and Prieto, A. and Dahmer Hahn, 
                         L. G.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Laborat{\'o}rio Nacional de Astrof{\'{\i}}sica (LNA)} and 
                         {Universidade Federal do Rio Grande do Sul (UFRGS)} and 
                         {Laborat{\'o}rio Nacional de Astrof{\'{\i}}sica (LNA)} and 
                         {Instituto de Astrofisica Canarias} and {Laborat{\'o}rio Nacional 
                         de Astrof{\'{\i}}sica (LNA)}",
                title = "Coronal-line forest active galactic nuclei - I. Physical 
                         properties of the emission-line regions",
              journal = "Monthly Notices of the Royal Astronomical Society",
                 year = "2021",
               volume = "500",
               number = "2",
                pages = "2667--2685",
                month = "Jan.",
             keywords = "galaxies: active, galaxies: Seyfert, infrared: galaxies.",
             abstract = "Coronal-line forest (CLiF) active galactic nuclei (AGNs) are 
                         characterized by strong high-ionization lines, which contrasts 
                         with what is found in most AGNs. Here, we carry out a 
                         multiwavelength analysis aimed at understanding the physical 
                         processes in the narrow-line region (NLR) of these objects, and at 
                         discovering whether they are indeed a special class of AGNs. By 
                         comparing coronal emission-line ratios we conclude that there are 
                         no differences between CLiF and non-CLiF AGNs. We derive physical 
                         conditions of the NLR gas and we find electron densities in the 
                         range of 3.6 x 10(2) to 1.7 x 10(4) cm(-3) and temperatures of 3.7 
                         x 10(3) to 6.3 x 10(4) K, suggesting that the ionization mechanism 
                         is associated primarily with photoionization by the AGN. We 
                         suggest an NLR dominated by matter-bounded clouds to explain the 
                         high-ionization line spectrum observed. The mass of the central 
                         black hole, derived from the stellar velocity dispersion, shows 
                         that most of the objects have values in the interval 10(7)-10(8) 
                         M-circle dot. Our results imply that CLiF AGNs are not in a 
                         separate category of AGNs. In all optical/near-infrared 
                         emission-line properties analysed, they represent an extension to 
                         the low/high ends of the distribution within the AGN class.",
                  doi = "10.1093/mnras/staa3320",
                  url = "http://dx.doi.org/10.1093/mnras/staa3320",
                 issn = "0035-8711 and 1365-2966",
             language = "en",
           targetfile = "cerqueira_coronal.pdf",
        urlaccessdate = "09 maio 2024"
}