typical of luminous $z\simeq6$ galaxies. However, we cannot rule out the possibility that some of these companions are foreground interlopers. Infrared observations with the James Webb Space Telescope will be needed to detect the $z\simeq6$ quasar host galaxies and better constrain their stellar mass and dust content.'
author:
- 'M. A. Marshall'
- 'M. Mechtley'
- 'R. A. Windhorst'
- 'S. H. Cohen'
- 'R. A. Jansen'
- 'L. Jiang'
- 'V. R. Jones'
- 'J. S. B. Wyithe'
- 'X. Fan'
- 'N. P. Hathi'
- 'K. Jahnke'
- 'W. C. Keel'
- 'A. M. Koekemoer'
- 'V. Marian'
- 'K. Ren'
- 'J. Robinson'
- 'H. J. A. R[ö]{}ttgering'
- 'R. E. Ryan, Jr.'
- 'E. Scannapieco'
- 'D. P. Schneider'
- 'G. Schneider'
- 'B. M. Smith'
- 'H. Yan'
bibliography:
- 'manuscript.bib'
title: 'Limits to Rest-Frame Ultraviolet Emission From Far-Infrared-Luminous $z\simeq{}6$ Quasar Hosts'
---

Introduction
============

Since their initial discovery in the Sloan Digital Sky Survey [SDSS, @fan_2000; @fan_2001; @fan_2003; @fan_2004], high-redshift ($z\gtrsim6$) quasars have been invaluable probes of the early Universe. These quasars can constrain black hole seed theories [@mortlock_2011; @Volonteri2012; @Banados2017], the reionization history of the Universe [@Fan2006a; @mortlock_2011; @Greig2016; @Davies2018; @Greig2019], and provide 