Do Current X-Ray Observations Capture Most of the Black-hole Accretion at High Redshifts?

@article{Yang2021DoCX,
  title={Do Current X-Ray Observations Capture Most of the Black-hole Accretion at High Redshifts?},
  author={Guang 光 Yang 杨 and Vicente Estrada-Carpenter and Casey Papovich and Fabio Vito and Jonelle L. Walsh and Zhiyuan Yao and Fenge Yuan},
  journal={The Astrophysical Journal},
  year={2021},
  volume={921}
}
The cosmic black hole accretion density (BHAD) is critical for our understanding of the formation and evolution of supermassive black holes (BHs). However, at high redshifts (z > 3), X-ray observations report BHADs significantly (∼10 times) lower than those predicted by cosmological simulations. It is therefore paramount to constrain the high-z BHAD using independent methods other than direct X-ray detections. The recently established relation between star formation rate and BH accretion rate… 
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