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Title: Constraints on the Duty Cycles of Quasars at z ~ 6

Journal Article · · The Astrophysical Journal (Online)
ORCiD logo [1];  [2]
  1. The Univ. of Chicago, Chicago, IL (United States)
  2. The Univ. of Chicago, Chicago, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

We study the mass of quasar-hosting dark matter halos at z ~ 6 and further constrain the fraction of dark matter halos hosting active quasars f on and the quasar opening angle i max using observations of C ii lines in the literature. We make assumptions that (1) on average more massive halos host quasars with higher peak brightness, (2) cold gas in galaxies has rotational velocity V circ = αV max, where V max is the maximum circular velocity of dark matter particles obtained from DM-only simulation and α ~ 1 is a free parameter, (3) a fraction f on of the halos host active quasars with a certain opening angle i max, and that (4) quasars point randomly on the sky. We find that for a choice of specific α ≳ 1, the most likely solution has f on < 0.01, corresponding to a small duty cycle of quasar activity. We also apply a bounded flat prior on α and marginalize over it, and we find the most likely f on shift to 1 as the upper-boundary of α decreases below 1. Altogether, our constraints are highly sensitive to α and hence inconclusive. Stronger constraints on f on can be made if we better understand the dynamics of cold gas in these galaxies.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1497715
Report Number(s):
FERMILAB-PUB--18-747-A; arXiv:1809.01545; 1722222
Journal Information:
The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 868; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Black hole obscuration and duty-cycles mediated by AGN feedback in high-redshift galaxies journal May 2019
Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). VIII. A less biased view of the early co-evolution of black holes and host galaxies journal September 2019
Black versus Dark: Rapid Growth of Supermassive Black Holes in Dark Matter Halos at z ∼ 6 journal February 2019
Black hole obscuration and duty cycles mediated by AGN feedback in high redshift galaxies text January 2019