Furthest "cloaked BH" found:

[beecee]

https://phys.org/news/2019-08-evidence-cloaked-black-hole-early.html

Evidence found for cloaked black hole in early universe:

A group of astronomers, including Penn State scientists, has announced the likely discovery of a highly obscured black hole existing only 850 million years after the Big Bang, using NASA's Chandra X-ray Observatory. This is the first evidence for a cloaked black hole at such an early time.

Supermassive black holes typically grow by pulling in material from a disk of surrounding matter. For the most rapid growth, this process generates prodigious amounts of radiation in a very small region around the black hole, and produces an extremely bright, compact source called a quasar.

Theoretical calculations indicate that most of the early growth of black holes occurs while the black hole and disk are surrounded by a dense cloud of gas that feeds material into the disk. As the black hole grows, the gas in the cloud is depleted until the black hole and its bright disk are uncovered.

more at link.....

the paper:

https://www.aanda.org/articles/aa/pdf/2019/08/aa35924-19.pdf

Discovery of the first heavily obscured QSO candidate at z > 6 in a close galaxy pair:

ABSTRACT:
While theoretical arguments predict that most of the early growth of supermassive black holes (SMBHs) happened during heavily obscured phases of accretion, current methods used for selecting z > 6 quasars (QSOs) are strongly biased against obscured QSOs, thus considerably limiting our understanding of accreting SMBHs during the first gigayear of the Universe from an observational point of view. We report the Chandra discovery of the first heavily obscured QSO candidate in the early universe, hosted by a close (≈5 kpc) galaxy pair at z = 6.515. One of the members is an optically classified type-1 QSO, PSO167–13. The companion galaxy was first detected as a [C II] emitter by Atacama large millimeter array (ALMA). An X-ray source is significantly (P = 0.9996) detected by Chandra in the 2–5 keV band, with < 1.14 net counts in the 0.5–2 keV band, although the current positional uncertainty does not allow a conclusive association with either PSO167–13 or its companion galaxy. From X-ray photometry and hardness-ratio arguments, we estimated an obscuring column density of NH > 2 × 1024 cm−2 and NH > 6 × 1023 cm−2 at 68% and 90% confidence levels, respectively. Thus, regardless of which of the two galaxies is associated with the X-ray emission, this source is the first heavily obscured QSO candidate at z > 6.
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This seems to me to also support the notion that the first stars formed much earlier then thought, and as indicated in the thread......https://www.scienceforums.net/topic/119767-star-thats-nearly-as-old-as-the-universe/
The incredible discovery of gravitational waves as predicted by GR, may throw more light on these latest discoveries, and certainly refine the error bars in such measurements. Also possibly other "soon to be launched" scientific instruments such as JWST and the LISA, as well as the finished SKA. 
The mind boggles at the potential discoveries and knowledge to be gained by such endeavours

Any errors, alterations or corrections needed above?

Edited August 8, 2019 by beecee