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- W2054265909 abstract "A search was made of the radio-frequency spectrum of Cygnus A and Virgo A for absorption arising from intergalactic neutral hydrogen. A switched-frequency receiving technique which incorporated a large frequency scan was used in the investigation. The upper limit (95 per cent probability) to the optical depth of hydrogen at the red-shifted velocity of Cygnus A was placed at ≼ 0.0012. This is fifty times less than the effect originally claimed by Lilley & McClain. The optical depth of absorption due to intergalactic hydrogen is less than 0.0009 and a complementary experiment to measure emission from intergalactic neutral hydrogen showed that the emission temperature was less than 0.57°K. The observations of Virgo A revealed no intergalactic absorption features greater than an optical depth of 0.02." @default.
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- W2054265909 date "1964-07-01" @default.
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- W2054265909 title "A Search for Intergalactic Neutral Hydrogen: I. The Observations" @default.
- W2054265909 doi "https://doi.org/10.1093/mnras/128.2.123" @default.
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