Abstract
view Abstract Citations (5) References (7) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Radio-frequency limits to the abundance of intergalactic neutral hydrogen. Lang, K. R. Abstract Radio-frequency spectra were obtained in order to search for neutral hydrogen in or along the line of sight to the radio galaxies 3C 264, 3C 270, 3C 272.1, and 3C 296. New limits to the volume density of intergalactic neutral hydrogen were obtained. The respective upper limits for the four sources are 2.6 millionths per cu cm, 92 millionths per cu cm, 56 millionths per cu cm, and 1.7 millionths per cu cm. The upper limits are considered to be at better than the 90-per cent confidence level. Because the number density of neutral hydrogen needed to close the Universe is 2 millionths per cu cm, these observations provide additional support for the conclusion that there is insufficient intergalactic hydrogen to stop the expansion of the Universe. Publication: The Astrophysical Journal Pub Date: June 1976 DOI: 10.1086/182140 Bibcode: 1976ApJ...206L..91L Keywords: Abundance; Hydrogen; Intergalactic Media; Radio Spectra; Big Bang Cosmology; Frequency Response; Gas Density; Mass Distribution; Radio Sources (Astronomy); Astrophysics full text sources ADS |
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