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		<doi>10.1093/mnras/staa1568</doi>
		<issn>0035-8711</issn>
		<issn>1365-2966</issn>
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		<citationkey>NunesPacu:2020:EfHuPa</citationkey>
		<title>Effects of the Hubble parameter on the cosmic growth of the first quasars</title>
		<year>2020</year>
		<typeofwork>journal article</typeofwork>
		<secondarytype>PRE PI</secondarytype>
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		<size>634 KiB</size>
		<author>Nunes, Rafael da Costa,</author>
		<author>Pacucci, Fabio,</author>
		<group>DIDAS-CGCEA-INPE-MCTIC-GOV-BR</group>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Harvard University</affiliation>
		<electronicmailaddress>rafadcnunes@gmail.com</electronicmailaddress>
		<electronicmailaddress>fabio.pacucci@cfa.harvard.edu</electronicmailaddress>
		<e-mailaddress>rafadcnunes@gmail.com</e-mailaddress>
		<journal>Monthly Notices of the Royal Astronomical Society</journal>
		<volume>496</volume>
		<number>1</number>
		<pages>888–893</pages>
		<secondarymark>A1_QUÍMICA A1_INTERDISCIPLINAR A1_GEOCIÊNCIAS A1_ENGENHARIAS_III A2_MATEMÁTICA_/_PROBABILIDADE_E_ESTATÍSTICA A2_ASTRONOMIA_/_FÍSICA B2_ENSINO B5_ENGENHARIAS_IV</secondarymark>
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		<keywords>quasars: supermassive black holes – cosmological parameters – dark ages, reionization, first stars – early Universe – cosmology: observations – cosmology: theory.</keywords>
		<abstract>Supermassive black holes (SMBHs) play a crucial role in the evolution of galaxies and are currently detected up to z&#8764;7.5. Theories describing black hole (BH) growth are challenged by howrapidly seeds with initialmassM  105M, formed at z&#8764;2030, grewtoM &#8764; 109M by z &#8764; 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&#8722;1Mpc&#8722;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 &#8722;3.3 km s&#8722;1Mpc&#8722;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 &#8722;1.4 km s&#8722;1Mpc&#8722;1 and fEdd = 0.77+0.035 &#8722;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 &#8764;3&#963.</abstract>
		<area>CEA</area>
		<language>en</language>
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