Maximum amplitude of the high-redshift 21-cm absorption feature
نویسندگان
چکیده
منابع مشابه
A deep search for 21 cm absorption in high redshift damped Lyman - α systems .
We present deep GMRT 21cm absorption spectra of 10 damped Lyman-α systems (DLAs), of which 8 are at redshifts z >∼ 1.3. HI absorption was detected in only one DLA, the z = 0.5318 absorber toward PKS 1629+12. This absorber has been identified with a luminous spiral galaxy; the spin temperature limit (Ts ≤ 310 K) derived from our observations continues the trend of DLAs associated with bright spi...
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The 21 cm emission and absorption from gaseous halos around the first generation of stars substantially depend on the Wouthuysen-Field (W-F) coupling, which relates the spin temperature with the kinetic temperature of hydrogen gas via the resonant scattering between Lyα photons and neutral hydrogen. Therefore, the existence of Lyα photons in the 21 cm region is essential. Although the center ob...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2020
ISSN: 2470-0010,2470-0029
DOI: 10.1103/physrevd.101.083502