Are the Lyman alpha forest "clouds" expanding pancakes?

Details Are the Lyman alpha forest "clouds" expanding pancakes? Are the Lyman alpha forest "clouds" expanding pancakes?

1995-12-06

arxiv.org/abs/astro-ph/9512024v1

Astronomy and Astrophysics

Astrophysics

6 pages, uuencoded postscript file, 2 figures included, to appear in the proceedings of the conference on "Cold Gas at High Re

Scientific paper

The large sizes of Lyman alpha ``clouds'' inferred from coincident absorption
in the spectrum of close quasar pairs suggests that these are transient
flattened structures of small overdensity. It is argued that the observed
absorbers should be preferentially located in underdense regions of the
universe and should typically expand faster than the Hubble flow.

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