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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 | | Abstract: | We 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 | | Services: | Forum | Review | PDF | Favorites | |
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