PI: Xiaohui Fan, University of Arizona (Astronomy), firstname.lastname@example.org
Address: Department of Astronomy and Steward Observatory, 933 North Cherry Avenue, Tucson, AZ 85721-0065, USA
CoI: Linhua Jiang, Arizona State University
CoI: Ian Mcgreer, University of Arizona (Astronomy)
CoI: Feige Wang, Peking University
CoI: Xue-Bing Wu, The Kavli Institute for Astronomy and Astrophysics
CoI: Fuyan Bian, The Australian National University
CoI: Ran Wang, The Kavli Institute for Astronomy and Astrophysics
Title: A Fifteen-billion Solar Mass Black Hole at the End of Reionzation?
Abstract: The existence of luminous quasars at z>6 indicates a rapid growth of supermasive black holes (BHs) in the early universe. Here we request to carry out GNIRS Near-IR spectroscopy of a newly discovered ultra-luminous quasar J0100+2802 at z=6.30. At z_AB=18.4, it is the most luminous object ever discovered at z>6 and ten times brighter than an average SDSS quasar at this redshift. We find a lower limit on the BH mass of fifteen billion solar masses, derived from its bolometric luminosity assuming Eddington accretion. Because of the quasar's high luminosity, with only one hour of integration using GNIRS, we will be able to detect and measure the properties of all major board emission lines. The CIV and MgII line width will allow us to accurate determine the quasar BH mass and Eddington ratio. The new observation will confirm whether we have discovered the first BH exceeding 10 billion solar masses at z>6, thus shed light on the nature of extreme BH accretion at the end of reionization. Emission line ratios will also be used the determine the chemical abundance within quasar broad emission line region and constrain star formation and chemical enrichment in the quasar environment.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360