Is there a pancake at Z = 3.4?

Details Is there a pancake at Z = 3.4? Is there a pancake at Z = 3.4?

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401l..53s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 401, no. 2, p. L53-L56.

Astronomy and Astrophysics

Astronomy

4

Astronomical Maps, Cosmology, Radio Astronomy, Universe, Dark Matter, Emission Spectra, Interstellar Masers, Lyman Alpha Radiation, Molecular Clouds, Red Shift

Scientific paper

Uson, Bagri, and Cornwell (1991) have detected an emission feature in a radio map at 323 MHz, which they identify as redshifted 21 cm radiation from a Zel'dovich pancake at z = 3.4. Such objects do not naturally occur in cosmological scenarios where structure builds up from the smallest scales. The large inferred mass in the object together with its relatively narrow velocity width lead to the suggested identification. Possible ways of avoiding the inference of high mass, none of which turn out to be realistic are discussed. Consideration is given to how improbable it might be to observe such an object in models like the cold dark matter theory. If the feature is confirmed and structure forms hierarchically, then the object must be rare.

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