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Title: Cosmos Redshift 7 is an Active Black Hole

Journal Article · · The Astrophysical Journal. Letters (Online)
 [1];  [2];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Brigham Young Univ., Provo, UT (United States)

We present the first ab initio cosmological simulations of a CR7-like object which approximately reproduce the observed line widths and strengths. In our model, CR7 is powered by a massive (3:23 107 M ) black hole (BH) the accretion rate of which varies between ' 0.25 and ' 0.9 times the Eddington rate on timescales as short as 103 yr. Our model takes into account multi-dimensional effects, X-ray feedback, secondary ionizations and primordial chemistry. We estimate Ly- line widths by post-processing simulation output with Monte Carlo radiative transfer and calculate emissivity contributions from radiative recombination and collisional excitation. We find the luminosities in the Lyman- and He II 1640 angstrom lines to be 5:0 1044 and 2:4 1043 erg s-1, respectively, in agreement with the observed values of > 8:3 1043 and 2:0 1043 erg s-1. We also find that the black hole heats the halo and renders it unable to produce stars as required to keep the halo metal free. These results demonstrate the viability of the BH hypothesis for CR7 in a cosmological context. Assuming the BH mass and accretion rate that we find, we estimate the synchrotron luminosity of CR7 to be P ' 1040 - 1041 erg s-1, which is sufficiently luminous to be observed in Jy observations and would discriminate this scenario from one where the luminosity is driven by Population III stars.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1338773
Report Number(s):
LA-UR-16-21373; TRN: US1701639
Journal Information:
The Astrophysical Journal. Letters (Online), Vol. 829, Issue 1; ISSN 2041-8213
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (14)

Titans of the early Universe: The Prato statement on the origin of the first supermassive black holes journal January 2019
Predicting Ly α escape fractions with a simple observable: Ly α in emission as an empirically calibrated star formation rate indicator journal March 2019
The first supermassive black holes journal June 2017
Lyman α radiation hydrodynamics of galactic winds before cosmic reionization journal October 2016
Chasing the observational signatures of seed black holes at z > 7: candidate observability journal January 2018
SILVERRUSH. III. Deep optical and near-infrared spectroscopy for Lyα and UV-nebular lines of bright Lyα emitters at z = 6–7†‡ journal November 2017
BOOSTING LY α AND He ii λ 1640 LINE FLUXES FROM POPULATION III GALAXIES: STOCHASTIC IMF SAMPLING AND DEPARTURES FROM CASE-B journal December 2016
The Location and Environments of Neutron Star Mergers in an Evolving Universe journal September 2018
Radiation Hydrodynamical Simulations of the First Quasars journal September 2018
Lyman-alpha radiation hydrodynamics of galactic winds before cosmic reionization text January 2016
The first supermassive black holes text January 2017
Chasing the observational signatures of seed black holes at z > 7: candidate observability text January 2018
The Location and Environments of Neutron Star Mergers in an Evolving Universe text January 2018
Titans of the Early Universe: The Prato Statement on the Origin of the First Supermassive Black Holes text January 2018

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