your ID: 0293 
First Name: Yuexing 
Last Name: Li 
Affiliation: Harvard University 

Title: Formation of the most distant and luminous quasars in LCDM 
Authors: Yuexing Li, Lars Hernquist, Brant Robertson, Thomas Cox, 
Phil Hopkins, Volker Springel, Liang Gao, Tiziana DiMatteo, 
Andrew Zentner, Adrian Jenkins, Naoki Yoshida 
Topic: 1 
Session: oral 
Abstract: The discoveries of luminous quasars at redshift $z > 6$ indicate the 
presence of supermassive black holes (SMBHs) of $\\sim 10^9 \\Msun$ and 
galaxies of $\\sim 10^{12} \\Msun$ when the Universe was less than $10^9$ years 
old. This finding challenges theoretical models to form such massive objects early 
in the $\\Lambda$-cold dark matter ($\\Lambda$CDM) cosmology. Here, we 
present the first multi-scale simulations that self-consistently reproduces the 
observed properties of the quasar at redshift $z\\approx6.5$ in the $\\Lambda$CDM 
paradigm. Moreover, we make specific predictions for the nature of its host galaxy.
 We find that even such a rare quasar forms naturally and rapidly through hierarchical 
galaxy mergers, and that the SMBHs 
grow through gas accretion under the Eddington limit in a self-regulated manner owing 
to feedback. Furthermore, we predict that the progenitors of this quasar are strong starburst 
galaxies at even higher redshifts, and that the quasar host obeys the same 
$M_{\\rm BH} - M_{\\rm bulge}$ scaling relation as measured in the local Universe.