A search for redshifted neutral hydrogen from protoclusters of galaxies

Details A search for redshifted neutral hydrogen from protoclusters of galaxies A search for redshifted neutral hydrogen from protoclusters of galaxies

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377l..65u&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 377, Aug. 20, 1991, p. L65-L68.

Astronomy and Astrophysics

Astronomy

19

Galactic Clusters, Galactic Evolution, Radio Sources (Astronomy), Red Shift, Universe, Cosmology, Hydrogen, Image Processing, Very Large Array (Vla)

Scientific paper

The VLA to search for highly redshifted (Z = 3.3) '21 cm' line emission from protoclusters of galaxies. The sensitivity, about 3.5 mJy per synthesized beam for spectral channels of width about 100 kHz, was limited at this level by statistical noise. The existence of any Zel'dovich 'pancake' in the surveyed volume with a component of neutral hydrogen with mass greater than about 10 to the 14th solar mass is ruled out. This limit does not depend on the degree of fragmentation of such a structure.

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