Radio detections of neutral hydrogen at redshift Z=3.4

Juan M. Uson, Durgadas S. Bagri, and Timothy J. Cornwell
Phys. Rev. Lett. 67, 3328 – Published 9 December 1991
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Abstract

We have used the Very Large Array to search for ‘‘21-cm’’ narrow-band signals from neutral hydrogen at redshift Z=3.4. We detect absorption at Z=3.3968±0.0004 against a radio source that has been previously identified with a ‘‘normal’’ galaxy at Z=3.395±0.005. We detect emission at Z=3.3970±0.0003 separated from the absorption by 33 (7–24 Mpc, depending on the cosmological model). This narrow-band emission signal is due to about 3×1014 M of neutral hydrogen as expected from a protocluster of galaxies. We identify it as the first example of a Zel’dovich ‘‘pancake.’’

  • Received 14 August 1991

DOI:https://doi.org/10.1103/PhysRevLett.67.3328

©1991 American Physical Society

Authors & Affiliations

Juan M. Uson, Durgadas S. Bagri, and Timothy J. Cornwell

  • National Radio Astronomy Observatory, P. O. Box O, Socorro, New Mexico 87801

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Issue

Vol. 67, Iss. 24 — 9 December 1991

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