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25 October 2021
 
  » arxiv » 1910.8622

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Probing primordial $^3$He from hyperfine line afterglows around supercritical black holes
Evgenii O. Vasiliev ; Shiv K. Sethi ; Yuri A. Shchekinov ;
Date 18 Oct 2019
AbstractWe consider the possibility of the detection of $^3$HeII hyperfine line (rest frequency, $8.67 , m GHz$) emission from ionized zones around accreting black holes (BHs) formed at high redshifts, $z=15hbox{--}30$. We show that the brightness temperature in 8.67GHz line increases and reaches a peak value after the accretion onto the BH exhausts and HeIII recombines into HeII. This period of brightening last up to 40~million years. We find that during this period the maximum brightness temperature reaches $simeq 0.2hbox{--}0.5 mu$K, depending on the epoch when such a black hole starts growing. The maximum angular size of the region emitting in the hyperfine line is around $0.5’$. The flux from such a region ($simeq 0.3 , m nJy$) is too small to be detected by SKA1-MID. The RMS of the collective flux from many emitting regions from a volume bounded by the synthesized beam and the band-width of SKA1-MID might reach 100~nJy, which is potentially detectable by SKA1-MID.
Source arXiv, 1910.8622
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