|
| | | | |
| | | |
| Stat |
Members: 3286
Articles: 2'244'908
Articles rated: 2592
19 August 2022 |
|
| | | | |
|
Article overview
| |
|
|
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 | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser CCBot/2.0 (https://commoncrawl.org/faq/)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER