21cm Absorption

21cm Absorption

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• Probing the Dark Ages with 21 cm Absorption

• Probing Into The “Dark Ages” with a Low Frequency Interferometer on the Moon

• Hi 21-CM ABSORPTION AND UNIFIED SCHEMES OF ACTIVE GALACTIC NUCLEI
  • 21cm absorption has never been detected in objects in the ultra-violet luminosity \(L_{uv} ~ 10^{23} W Hz^{-1}\)
  • From studies in CSS(Compact Steep Spectrum) and GPS(Gigahertz Peaked Spectrum) 21cm absorption has has been found in type-2 objects like galaxies rather than type-1