@Article{NunesPacu:2020:EfHuPa,
               author = "Nunes, Rafael da Costa and Pacucci, Fabio",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Harvard 
                         University}",
                title = "Effects of the Hubble parameter on the cosmic growth of the first 
                         quasars",
              journal = "Monthly Notices of the Royal Astronomical Society",
                 year = "2020",
               volume = "496",
               number = "1",
                pages = "888–893",
             keywords = "quasars: supermassive black holes – cosmological parameters – dark 
                         ages, reionization, first stars – early Universe – cosmology: 
                         observations – cosmology: theory.",
             abstract = "Supermassive black holes (SMBHs) play a crucial role in the 
                         evolution of galaxies and are currently detected up to 
                         z\∼7.5. Theories describing black hole (BH) growth are 
                         challenged by howrapidly seeds with initialmassM 105M, formed at 
                         z\∼2030, grewtoM \∼ 109M by z \∼ 7. Here we 
                         study the effects of the value of the Hubble parameter, H0, on 
                         models describing the early growth of BHs. First, we note that the 
                         predicted mass of a quasar at z = 6 changes by > 300 per cent if 
                         the underlying Hubble parameter used in the model varies from H0 = 
                         65 to H0 = 74 km s\−1Mpc\−1, a range encompassing 
                         current estimates. Employing an MCMCapproach based on priors from 
                         z6.5 quasars and onH0,we study the interconnection between H0 and 
                         the parameters describing BH growth: seed mass Mi and Eddington 
                         ratio fEdd. Assuming an Eddington ratio of fEdd = 0.7, in 
                         agreement with previous estimates, we find H0 = 73.6+1.2 
                         \−3.3 km s\−1Mpc\−1. In a second analysis, 
                         allowing all the parameters to vary freely, we find log (Mi/M) > 
                         4.5 (at 95 per cent CL), H0 = 74+1.5 \−1.4 km 
                         s\−1Mpc\−1 and fEdd = 0.77+0.035 \−0.026 at 
                         68 per cent CL. Our results on the typical Eddington ratio are in 
                         agreement with previous estimates. Current values of the Hubble 
                         parameter strongly favour heavy seed formation scenarios, with Mi 
                         104M. In our model, with the priors on BH masses of quasars used, 
                         light seed formation scenarios are rejected at 
                         \∼3\σ.",
                  doi = "10.1093/mnras/staa1568",
                  url = "http://dx.doi.org/10.1093/mnras/staa1568",
                 issn = "0035-8711 and 1365-2966",
                label = "self-archiving-INPE-MCTIC-GOV-BR",
             language = "en",
           targetfile = "nunes_effects.pdf",
        urlaccessdate = "27 abr. 2024"
}